CN117147091B - Maintenance platform for dew point measurement of low-temperature wind tunnel test section and use method - Google Patents
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Abstract
本发明公开了面向低温风洞试验段露点测量的检修平台及使用方法，涉及风洞测试技术领域，所述检修平台用于对露点测量系统进行检修，所述检修平台包括：一个主体管路和两个观察管路，观察管路与主体管路连通，所述主体管路两端分别设有用于安装露点测量系统中发射接收一体化模块和光学反射单元的接口，其中一个观察管路一端与主体管路一端侧面连接，另一个观察管路一端与主体管路另一端侧面连接，两个观察管路的另一端均设有密封观察窗，所述主体管路上设有气源进出接口，本发明能够对露点测量系统进行校验。
The invention discloses an inspection and maintenance platform for measuring dew point in a low-temperature wind tunnel test section and a method for using the same, and relates to the technical field of wind tunnel testing. The inspection and maintenance platform is used for inspecting a dew point measurement system, and comprises: a main pipeline and two observation pipelines, the observation pipeline is connected to the main pipeline, and interfaces for installing an integrated transmitting and receiving module and an optical reflection unit in a dew point measurement system are respectively provided at both ends of the main pipeline, one end of one observation pipeline is connected to the side of one end of the main pipeline, and one end of the other observation pipeline is connected to the side of the other end of the main pipeline, and the other ends of the two observation pipelines are both provided with sealed observation windows, and the main pipeline is provided with an air source inlet and outlet interface. The invention can calibrate the dew point measurement system.
Description
技术领域Technical Field
本发明涉及风洞测试技术领域，具体地，涉及面向低温风洞试验段露点测量的检修平台及使用方法。The present invention relates to the technical field of wind tunnel testing, and in particular to an inspection and maintenance platform for measuring dew point in a low-temperature wind tunnel test section and a method for using the platform.
背景技术Background Art
低温高雷诺数风洞是进行大型飞机、先进战机和往返大气层航天飞行器研制过程中进行复杂粘性流场性能研究必不可少的设备。与常温风洞不同，低温风洞运行介质为低温，从而对风洞中水蒸汽浓度控制提出了严格要求，以避免水汽在测试模型表面结霜/结冰，影响风洞模型试验测试精度。为此，在低温跨声速风洞降温前的清洗干燥过程中，需将水汽降低到足够低的水平。露点，也称为露点温度，是气体中水汽在保持压力不变的条件下、降温到凝结成露或结霜时的温度。它可用于表征气体中水汽含量。根据低温风洞设计需求，在低温风洞清洗和降温过程中需对气体露点进行在线监测，露点测量范围为-100℃～20℃，其中，-100℃～-80℃露点范围，测量误差小于±2℃，-80℃～20℃露点范围，测量误差小于±1℃。当前，风洞露点测量主要采用冷镜式露点仪进行气体抽取式测量。抽取式露点测量中，露点测量结果会受到管路对水汽的吸脱附效应影响，造成测量结果的误差，甚至错误。冷镜式露点仪镜面还容易受到污染，影响测量精度，并且，冷镜式露点仪在极低露点条件下测量响应时间较长(例如，露点温度低于-80℃、响应时间达到10分钟左右)。Low-temperature and high-Reynolds number wind tunnels are essential equipment for studying the performance of complex viscous flow fields during the development of large aircraft, advanced fighters, and spacecraft that travel to and from the atmosphere. Unlike normal-temperature wind tunnels, low-temperature wind tunnels operate in low-temperature medium, which places strict requirements on the control of water vapor concentration in the wind tunnel to avoid frost/ice on the surface of the test model, which affects the test accuracy of the wind tunnel model. To this end, the water vapor needs to be reduced to a sufficiently low level during the cleaning and drying process before the low-temperature transonic wind tunnel is cooled. Dew point, also known as dew point temperature, is the temperature at which water vapor in the gas condenses into dew or frost while maintaining constant pressure. It can be used to characterize the water vapor content in the gas. According to the design requirements of the low-temperature wind tunnel, the gas dew point needs to be monitored online during the cleaning and cooling process of the low-temperature wind tunnel. The dew point measurement range is -100℃～20℃, of which the measurement error is less than ±2℃ in the dew point range of -100℃～-80℃, and the measurement error is less than ±1℃ in the dew point range of -80℃～20℃. At present, wind tunnel dew point measurement mainly uses a chilled mirror dew point meter for gas extraction measurement. In the extraction dew point measurement, the dew point measurement result will be affected by the adsorption and desorption effect of the pipeline on water vapor, resulting in errors or even mistakes in the measurement result. The mirror surface of the chilled mirror dew point meter is also easily contaminated, affecting the measurement accuracy. In addition, the response time of the chilled mirror dew point meter is long under extremely low dew point conditions (for example, when the dew point temperature is lower than -80℃, the response time is about 10 minutes).
为了解决冷镜式露点仪在测量时存在的问题，现有技术中设计了一种解决方案，如CN115655639A-一种低温风洞试验段高动态露点原位在线测量系统，该系统后续中简称为露点测量系统，该系统能够实施高频响、实时高精度露点监测，为风洞降温程序实施提供判据，为试验过程中水汽浓度及变化检测、雷诺数计算提供气体状态参数，申请人发现使用该系统前需要先进行校验，否则容易出现测量不准确的情况，而现有技术中缺乏适用于该系统的校验方案。In order to solve the problems existing in the measurement of chilled mirror dew point meters, a solution has been designed in the prior art, such as CN115655639A - a high-dynamic dew point in-situ online measurement system for a low-temperature wind tunnel test section. The system is hereinafter referred to as a dew point measurement system. The system can implement high-frequency response, real-time and high-precision dew point monitoring, provide a criterion for the implementation of the wind tunnel cooling program, and provide gas state parameters for the detection of water vapor concentration and changes and the calculation of Reynolds number during the test. The applicant found that the system needs to be calibrated before use, otherwise inaccurate measurements are likely to occur, and the prior art lacks a calibration solution suitable for the system.
发明内容Summary of the invention
本发明目的是对露点测量系统进行校验。The object of the present invention is to calibrate a dew point measurement system.
为实现上述发明目的，本发明提供了面向低温风洞试验段露点测量的检修平台，所述校验平台用于对露点测量系统进行检修，所述检修平台包括：In order to achieve the above-mentioned purpose of the invention, the present invention provides a maintenance platform for measuring the dew point of a low-temperature wind tunnel test section, wherein the verification platform is used to perform maintenance on the dew point measurement system, and the maintenance platform comprises:
一个主体管路和两个观察管路，观察管路与主体管路连通，所述主体管路两端分别设有用于安装露点测量系统中发射接收一体化模块和光学反射单元的接口，其中一个观察管路一端与主体管路一端侧面连接，另一个观察管路一端与主体管路另一端侧面连接，两个观察管路的另一端均设有用于调试光路的观察窗，所述主体管路上设有气源进出接口，所述主体管路的长度与露点测量系统在风洞试验段安装时的长度相同，以创造风洞试验段应用时所需的测试环境。A main pipeline and two observation pipelines, the observation pipeline is connected with the main pipeline, and interfaces for installing the transmitting and receiving integrated module and the optical reflection unit in the dew point measurement system are respectively provided at both ends of the main pipeline, one end of one observation pipeline is connected to the side of one end of the main pipeline, and one end of the other observation pipeline is connected to the side of the other end of the main pipeline, and the other ends of the two observation pipelines are provided with observation windows for debugging the optical path, and the main pipeline is provided with air source inlet and outlet interfaces. The length of the main pipeline is the same as the length of the dew point measurement system when it is installed in the wind tunnel test section, so as to create the test environment required for the application of the wind tunnel test section.
其中，本发明校验的原理为将露点测量系统与检修平台对接，通过露点发生器对主体管路进行吹气，然后测量获得露点测量系统的测量数据，将测量数据与标准数据进行比较，进而能够对露点测量系统进行校验，其中设置两个观察管路便于对露点测量系统中发射接收一体化模块和光学反射单元中的光路信息进行观测，主体管路是用于模拟风洞试验段，风洞试验段的长度约为2.6m，因此，通过这个主体管路来构建这一个长度约为2.6m的光腔。两个观察窗是用于调节接发射接收一体化模块和光学反射单元，因为这两个单元安装上以后，就无法对内部进行调节了。具体调节过程是：先把观察窗打开，然后，进行光路的测试，看光路是否对齐，如果没有对齐，就手动调整，调整到位后，再加上密封光学窗。The principle of verification of the present invention is to connect the dew point measurement system with the maintenance platform, blow air to the main pipeline through the dew point generator, and then measure the measurement data of the dew point measurement system, compare the measurement data with the standard data, and then verify the dew point measurement system. Two observation pipelines are set to facilitate the observation of the optical path information in the transmitting and receiving integrated module and the optical reflection unit in the dew point measurement system. The main pipeline is used to simulate the wind tunnel test section. The length of the wind tunnel test section is about 2.6m. Therefore, this main pipeline is used to construct an optical cavity with a length of about 2.6m. The two observation windows are used to adjust the transmitting and receiving integrated module and the optical reflection unit, because after these two units are installed, the internal cannot be adjusted. The specific adjustment process is: first open the observation window, then test the optical path to see if the optical path is aligned. If it is not aligned, adjust it manually. After adjusting in place, add a sealed optical window.
所述用于安装露点测量系统中发射接收一体化模块和光学反射单元的接口为法兰盘，分别用于连接和密封发射接收一体化模块和光学反射单元。The interface for installing the transmitting-receiving integrated module and the optical reflecting unit in the dew point measurement system is a flange, which is used to connect and seal the transmitting-receiving integrated module and the optical reflecting unit respectively.
其中，法兰盘为中空结构，这样可以通过观察窗伸手或用工具伸入进去，对发射接收一体化模块和光学反射单元中的部件进行位置调整，在安装的时候，法兰盘是需要进行密封的，具体密封措施是：利用柔性的铜垫圈，通过施压拧紧的预应力，夹紧垫片实现密封。The flange is a hollow structure, so you can reach in through the observation window or use tools to adjust the position of the components in the integrated transmitting and receiving module and the optical reflection unit. During installation, the flange needs to be sealed. The specific sealing measures are: using a flexible copper gasket, pre-stressed by pressure and tightening, and clamping the gasket to achieve sealing.
在一些实施方式中，主体管路包括多个依次连接的主体管路段。其中，设计为由多个依次连接的主体管路段连接组成主体管路的目的是方便调节主体管路的长度。In some embodiments, the main pipeline includes a plurality of main pipeline sections connected in sequence, wherein the main pipeline is designed to be composed of a plurality of main pipeline sections connected in sequence to facilitate adjustment of the length of the main pipeline.
在一些实施方式中，主体管路段之间通过法兰盘连接，通过法兰盘连接方便安装和拆卸。In some embodiments, the main pipeline sections are connected by flanges, which facilitate installation and disassembly.
在一些实施方式中，主体管路和观察管路外表面均设有加热单元，利用加热单元可以加热除去管路中的水汽保障校验的准确性。In some embodiments, heating units are provided on the outer surfaces of the main pipeline and the observation pipeline, and the heating units can be used to heat and remove water vapor in the pipeline to ensure the accuracy of the calibration.
在一些实施方式中，其中一个观察窗用于观察发射接收一体化模块对应的光路信息，另外一个观察窗用于观察光学反射单元对应的光路信息。在设备装配过程中，打开观察窗后，可以通过观察窗对发射接收一体化模块、光学反射单元进行调节。In some embodiments, one observation window is used to observe the optical path information corresponding to the transmitting and receiving integrated module, and the other observation window is used to observe the optical path information corresponding to the optical reflection unit. During the equipment assembly process, after opening the observation window, the transmitting and receiving integrated module and the optical reflection unit can be adjusted through the observation window.
在一些实施方式中，所述气源进出接口分别与输入气管和输出气管的一端连接，输入气管的另一端通过三通阀与第一路输入、第二路输入和第一路输出连接，第一路输入接由露点发生器产生的标准湿气，第二路输入接氮气，第一路输出接输入气管；输出气管的另一端通过三通阀与第三路输入、第二路输出和第三路输出连接，第三路输入接输出气管，第二路输出与露点仪连接，第三路输出与真空泵连接。In some embodiments, the gas source inlet and outlet interfaces are respectively connected to one end of the input gas pipe and the output gas pipe, the other end of the input gas pipe is connected to the first input, the second input and the first output through a three-way valve, the first input is connected to the standard moisture generated by the dew point generator, the second input is connected to nitrogen, and the first output is connected to the input gas pipe; the other end of the output gas pipe is connected to the third input, the second output and the third output through a three-way valve, the third input is connected to the output gas pipe, the second output is connected to the dew point meter, and the third output is connected to the vacuum pump.
为了实现上述目的，本发明还提供了一种所述的面向低温风洞试验段露点测量的检修平台的使用方法，所述方法包括：In order to achieve the above-mentioned object, the present invention also provides a method for using the maintenance platform for measuring dew point in a low-temperature wind tunnel test section, the method comprising:
步骤1：对主体管路两侧的接口进行清洗；Step 1: Clean the interfaces on both sides of the main pipeline;
步骤2：将发射接收一体化模块和光学反射单元安装在主体管路两端，并通过观察窗对露点测量系统进行调节，确保露点测量系统的测试光路正常；Step 2: Install the transmitting and receiving integrated module and the optical reflection unit at both ends of the main pipeline, and adjust the dew point measurement system through the observation window to ensure that the test optical path of the dew point measurement system is normal;
步骤3：对主体管路和观察管路进行清洗；Step 3: Clean the main pipeline and observation pipeline;
步骤4：开启露点发生器，将露点测量系统的测量数据与气源出口处连接的露点仪的测量数据进行比较，基于比较结果判断是否需要对露点测量系统进行检修。其中，在本方法中露点是指气体中的水汽结露的温度值，这反映了气体中的水汽浓度或含量，因此，通过对露点进行测量，可以知道空气的干燥程度。一般而言，我们生活中的空气露点值是20℃，也就是说在20度时，就会出现结露。因此，在室内完成了这个系统的装配后(即：把所有设备装到主体管路、观察窗也密封后，主体管路里面的气体是很湿的，因此，我们需要通过一个吹扫的过程，把里面的湿气体置换出来。这就是吹扫的目的。把湿气体吹扫干净是一个比较漫长和困难的过程，很难一次性达到预期目标，因此，需要进行多次交替吹扫，其原因是，吹扫后，管路上或器件上沾附的水汽会再次脱离后进入气体，再次吹扫的时候，就可以把这些水汽带着，相比长时间的单次吹扫，在相同时间情况下，效果要好一些。本方法中使用的是高纯氮气，比如纯度为99.999％的高纯氮气，水汽含量极低，可以近似认为它是干燥的气体，不会对主体管路造成水汽污染；其中，抽真空的目的，也是为了快速排出湿气；将至室温是因为，在吹扫过程中，我们有伴热带对主体管路进行加热，加热可以有利用加速湿气的排放，加热完以后，让气体温度回到正常状态，有利于测量。Step 4: Turn on the dew point generator, compare the measured data of the dew point measurement system with the measured data of the dew point meter connected to the gas source outlet, and judge whether the dew point measurement system needs to be repaired based on the comparison results. Among them, in this method, the dew point refers to the temperature value at which water vapor in the gas condenses, which reflects the concentration or content of water vapor in the gas. Therefore, by measuring the dew point, the dryness of the air can be known. Generally speaking, the dew point value of the air in our lives is 20℃, which means that condensation will occur at 20 degrees. Therefore, after the assembly of the system is completed indoors (i.e., after all the equipment is installed in the main pipeline and the observation window is sealed), the gas in the main pipeline is very wet. Therefore, we need to replace the wet gas in it through a purging process. This is the purpose of purging. Purging the wet gas is a relatively long and difficult process, and it is difficult to achieve the expected goal at one time. Therefore, multiple alternating purging is required. The reason is that after purging, the water vapor attached to the pipeline or the device will be detached and enter the gas again. When purging again, these water vapors can be taken away. Compared with a long single purge, under the same time conditions, the effect is better. High-purity nitrogen is used in this method, such as high-purity nitrogen with a purity of 99.999%. The water vapor content is extremely low. It can be approximately considered as dry gas and will not cause water vapor pollution to the main pipeline; the purpose of vacuuming is also to quickly discharge moisture; it is brought to room temperature because, during the purging process, we have a heating belt to heat the main pipeline. Heating can be used to accelerate the discharge of moisture. After heating, the gas temperature returns to normal, which is conducive to measurement.
在一些实施方式中，所述步骤1包括对主体管路和观察管路进行多次清洗，其中单次清洗包括：In some embodiments, step 1 comprises cleaning the main pipeline and the observation pipeline multiple times, wherein a single cleaning comprises:
对主体管路和观察管路加热烘烤；Heat and bake the main pipeline and observation pipeline;
对烘烤后的主体管路和观察管路通入氮气清洗至主体管路和观察管路冷却至室温；The baked main pipeline and observation pipeline are cleaned by nitrogen until they are cooled to room temperature;
对冷却后的主体管路和观察管路抽真空。Evacuate the cooled main and observation lines.
在一些实施方式中，所述步骤2具体包括：In some embodiments, step 2 specifically includes:
将发射接收一体化模块和光学反射单元安装在试验管路两端，然后调节发射接收一体化模块中的光路至最大信号幅值，然后装配相应端盖。Install the transmitting and receiving integrated module and the optical reflection unit at both ends of the test pipeline, then adjust the optical path in the transmitting and receiving integrated module to the maximum signal amplitude, and then assemble the corresponding end caps.
其中，本发明中的光路要经历多次反射，当发生轻微变形时，就会导致无法获得光路的信号，因此，找到最大信号幅值，就是这个光路目前的最佳状态，在这个状态下，即便使用过程中，因为温度变化等因素导致轻微变形，也不会导致测量信号丢失。Among them, the optical path in the present invention undergoes multiple reflections. When a slight deformation occurs, the signal of the optical path will not be obtained. Therefore, finding the maximum signal amplitude is the current optimal state of the optical path. In this state, even if slight deformation occurs due to factors such as temperature changes during use, the measurement signal will not be lost.
本发明提供的一个或多个技术方案，至少具有如下技术效果或优点：One or more technical solutions provided by the present invention have at least the following technical effects or advantages:
利用本发明中的装置和方法能够对露点测量系统进行校验，且能够获得准确的校验结果。The device and method of the present invention can be used to calibrate the dew point measurement system and obtain accurate calibration results.
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
此处所说明的附图用来提供对本发明实施例的进一步理解，构成本发明的一部分，并不构成对本发明实施例的限定；The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of the present invention, and do not constitute a limitation on the embodiments of the present invention;
图1是本发明中检修平台的结构示意图；FIG1 is a schematic structural diagram of a maintenance platform in the present invention;
其中，1-主体管路，2-观察管路，3-观察窗。Among them, 1-main pipeline, 2-observation pipeline, 3-observation window.
具体实施方式DETAILED DESCRIPTION
为了能够更清楚地理解本发明的上述目的、特征和优点，下面结合附图和具体实施方式对本发明进行进一步的详细描述。需要说明的是，在相互不冲突的情况下，本发明的实施例及实施例中的特征可以相互组合。In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.
在下面的描述中阐述了很多具体细节以便于充分理解本发明，但是，本发明还可以采用其他不同于在此描述范围内的其他方式来实施，因此，本发明的保护范围并不受下面公开的具体实施例的限制。In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those within the scope of this description. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.
实施例一Embodiment 1
请参考图1，本发明实施例一提供了面向低温风洞试验段露点测量的检修平台，所述校验平台用于对露点测量系统进行检修，所述检修平台包括：Please refer to FIG1 , the first embodiment of the present invention provides a maintenance platform for measuring the dew point of a low-temperature wind tunnel test section, wherein the verification platform is used to perform maintenance on the dew point measurement system, and the maintenance platform includes:
一个主体管路1和两个观察管路2，观察管路与主体管路连通，所述主体管路两端分别设有用于安装露点测量系统中发射接收一体化模块和光学反射单元的接口，其中一个观察管路一端与主体管路一端侧面连接，另一个观察管路一端与主体管路另一端侧面连接，两个观察管路的另一端均设有用于调试光路的观察窗3，所述主体管路上设有气源进出接口，所述主体管路的长度与露点测量系统在风洞试验段安装时的长度相同，以创造风洞试验段应用时所需的测试环境。A main pipeline 1 and two observation pipelines 2, the observation pipeline is connected with the main pipeline, and interfaces for installing the transmitting and receiving integrated module and the optical reflection unit in the dew point measurement system are respectively provided at both ends of the main pipeline, one end of one observation pipeline is connected to the side of one end of the main pipeline, and one end of the other observation pipeline is connected to the side of the other end of the main pipeline, and the other ends of the two observation pipelines are provided with observation windows 3 for debugging the optical path, and the main pipeline is provided with air source inlet and outlet interfaces. The length of the main pipeline is the same as the length of the dew point measurement system when it is installed in the wind tunnel test section, so as to create the test environment required for the application of the wind tunnel test section.
其中，本实施例中的露点测量系统指CN115655639A中的一种低温风洞试验段高动态露点原位在线测量系统，该系统中后续简称为露点测量系统，对于该系统本实施例中不进行详细的赘述。Among them, the dew point measurement system in this embodiment refers to a high dynamic dew point in-situ online measurement system for a low-temperature wind tunnel test section in CN115655639A. This system is hereinafter referred to as the dew point measurement system, and no detailed description is given for this system in this embodiment.
其中，本平台用于模拟试验段风洞露点环境和安装方式，方便露点测量系统在风洞安装前或重现安装前进行验证。Among them, this platform is used to simulate the dew point environment and installation method of the wind tunnel in the test section, which is convenient for the verification of the dew point measurement system before the wind tunnel is installed or re-installed.
为实现低露点的检验测量，检修平台同时考虑按最小化体积设计，降低壁面脱吸附及环境水汽的影响。按照实际待安装露点测量系统中光学单元的风洞两侧光窗位置和光路传输，设计模拟风洞环境管道采用不锈钢管路，即主体管路不锈钢管路两端预留法兰安装发射接收一体化模块和光学反射单元，两个观察管路向外延伸的两端分别通过法兰安装有通光窗口，法兰模拟风洞壁面通光窗口安装方式与实际风洞保持一致。为避免环境空气进入到发射接收一体化模块和光学反射单元与模拟通光窗口，在主体管路两侧设置密封外罩，密封外罩中用高纯氮进行水汽本底去除，可以进一步避免环境对检验平台造成干扰，保障检验的准确性。In order to achieve low dew point inspection and measurement, the maintenance platform is designed to minimize the volume to reduce the influence of wall desorption and environmental water vapor. According to the position of the light windows on both sides of the wind tunnel of the optical unit in the actual dew point measurement system to be installed and the optical path transmission, the simulated wind tunnel environment pipeline is designed to use stainless steel pipelines, that is, flanges are reserved at both ends of the main pipeline stainless steel pipeline to install the integrated transmitting and receiving module and the optical reflection unit. The two ends of the two observation pipelines extending outward are respectively installed with light windows through flanges. The installation method of the flange simulated wind tunnel wall light windows is consistent with the actual wind tunnel. In order to prevent ambient air from entering the integrated transmitting and receiving module, the optical reflection unit and the simulated light windows, sealed covers are set on both sides of the main pipeline. High-purity nitrogen is used in the sealed covers to remove the water vapor background, which can further prevent the environment from interfering with the inspection platform and ensure the accuracy of the inspection.
检修平台中的一管路内表面进行抛光处理，体管路和观察管路外表面均设有加热单元，如外表面设置电加热带，在仪器耐温要求范围内持续加热、纯化器除水后高纯N2流洗消除脱附校验平台内水汽；校验平台预留与风洞试验段相同露点仪安装接口，预留进出气口，用于提供标准湿气接入和冷镜露点仪测量，完成-100℃～10℃露点范围内的露点测量校准。The inner surface of a pipeline in the maintenance platform is polished, and the outer surfaces of the body pipeline and the observation pipeline are equipped with heating units. For example, an electric heating belt is set on the outer surface to continuously heat within the temperature resistance requirement of the instrument. After the purifier removes water, high-purity N2 flow is used to eliminate the water vapor in the desorption verification platform. The verification platform reserves the same dew point meter installation interface as the wind tunnel test section, and reserves air inlet and outlet ports to provide standard wet gas access and cold mirror dew point meter measurement, and complete the dew point measurement calibration within the dew point range of -100℃ ~ 10℃.
其中，主体管路上的气源进出接口对接有用于输入和输出气管，输入气管上接三通阀：两路输入、一路输出，其中一路输入接入标准湿气，另外一路输入接入高纯氮气，其中标准湿气由露点发生器产生，一路输出口接到输入气管上；输出气管上接三通阀：一路输入、两路输出，一路输入接到输出气管上，其中一路输出接到常用露点仪上，另外一路输出接到真空泵上，且在真空泵的入口处接1个开关阀；所述常用露点仪为：冷镜露点仪或CRDS露点仪。Among them, the gas source inlet and outlet interfaces on the main pipeline are connected to the input and output gas pipes, and the input gas pipe is connected to a three-way valve: two inputs and one output, one input is connected to standard moisture, and the other input is connected to high-purity nitrogen, wherein the standard moisture is generated by a dew point generator, and one output port is connected to the input gas pipe; the output gas pipe is connected to a three-way valve: one input and two outputs, one input is connected to the output gas pipe, one output is connected to a commonly used dew point meter, and the other output is connected to a vacuum pump, and a switch valve is connected at the inlet of the vacuum pump; the commonly used dew point meter is: a chilled mirror dew point meter or a CRDS dew point meter.
主体管路为直筒型管道，可以为多段依次通过法兰连接组成，主体管路与观察管路，组成Z字形管路，主体管路两端的法兰盘与露点测量系统中的光学模块和单元进行连接。The main pipeline is a straight pipe and can be composed of multiple sections connected in sequence by flanges. The main pipeline and the observation pipeline form a Z-shaped pipeline. The flanges at both ends of the main pipeline are connected to the optical module and unit in the dew point measurement system.
检修平台中的部件通过法兰盘进行连接，方便拆卸和运输；观察管路设置了观察窗，从观察窗位置，可以看到里面的光路情况，方便进行设备的调试。The components in the maintenance platform are connected by flanges for easy disassembly and transportation; an observation window is set on the observation pipeline, from which the optical path inside can be seen, which is convenient for equipment debugging.
为降低环境空气对检修平台露点校准过程的影响，简化设计方案以保持模拟风洞环境管道的密封，本发明中的检修平台本身不包含振动、变形模拟验证结构。振动、变形模拟验证独立设置工装结构，用于手动固定露点测量发射接收一体化模块和光学反射单元，通过旋转和位移模拟形变影响；将工装结构固定于振动平台可模拟风洞壁面实际振动，进行振动容忍测试。In order to reduce the influence of ambient air on the dew point calibration process of the maintenance platform and simplify the design scheme to maintain the sealing of the simulated wind tunnel environment pipeline, the maintenance platform in the present invention does not include a vibration and deformation simulation verification structure. The vibration and deformation simulation verification independently sets up a tooling structure, which is used to manually fix the dew point measurement transmitting and receiving integrated module and the optical reflection unit, and simulates the deformation influence through rotation and displacement; fixing the tooling structure on the vibration platform can simulate the actual vibration of the wind tunnel wall and conduct vibration tolerance test.
检修平台露点测量校准过程包括：The dew point measurement calibration process of the maintenance platform includes:
首次风洞安装前或返修后风洞安装前，露点测量系统预先在检修平台上检验校准，确定其功能和性能指标满足要求，具体校准流程如下：Before installing the wind tunnel for the first time or after a repair, the dew point measurement system is pre-checked and calibrated on the inspection platform to ensure that its functions and performance indicators meet the requirements. The specific calibration process is as follows:
(1)检修平台主体管路中间段为风洞试验段条件的模拟段，在露点测量系统安装前，对管路进行加热烘烤，然后氮气清洗，然后抽真空处理，并重复进行多次，其中，氮气清洗为烘烤结束后通入经纯化器进一步去除杂气后的高纯氮，保持正压降温至室温，然后进行抽真空处理；(1) The middle section of the main pipeline of the maintenance platform is a simulated section of the wind tunnel test section conditions. Before the dew point measurement system is installed, the pipeline is heated and baked, then nitrogen purged, and then vacuumed, and the process is repeated multiple times. The nitrogen purge is to pass high-purity nitrogen that has been further removed from impurities by a purifier after baking, maintain positive pressure and cool down to room temperature, and then vacuumize;
(2)发射接收一体化模块和光学反射单元的筒体分别安装在校验平台主体管路两侧的固定筒体中，与中间端模拟风洞管道连接，调节光路至信号幅值最大后，进行两侧端盖装配与密封；(2) The cylinders of the transmitting and receiving integrated module and the optical reflection unit are respectively installed in the fixed cylinders on both sides of the main pipeline of the calibration platform, connected to the simulated wind tunnel pipeline at the middle end, and after adjusting the optical path to the maximum signal amplitude, the end covers on both sides are assembled and sealed;
(3)两侧端盖内通入高纯氮气吹扫，去除两端水汽本底影响；(3) High-purity nitrogen is introduced into the end covers on both sides to purge and remove the background influence of water vapor at both ends;
(4)在中央模拟段内接入露点发生器；(4) Connect a dew point generator to the central simulation section;
(5)管道内通入露点发生器标准气源，持续吹扫，等待露点数据稳定，并与冷镜式露点仪进行对比。(5) Introduce the dew point generator standard gas source into the pipeline, continue to purge, wait for the dew point data to stabilize, and compare it with the chilled mirror dew point meter.
根据现场测量的环境，检修平台的设计与风洞中的整体布局一致，能够模拟风洞中窗片对光路带来的影响，能够满足风洞试验前以及长时间风洞试验后的设备校准，验证露点测量系统测量的准确性。According to the on-site measurement environment, the design of the maintenance platform is consistent with the overall layout in the wind tunnel. It can simulate the impact of the windows in the wind tunnel on the optical path, meet the equipment calibration before and after long-term wind tunnel tests, and verify the accuracy of the dew point measurement system.
尽管已描述了本发明的优选实施例，但本领域内的技术人员一旦得知了基本创造性概念，则可对这些实施例作出另外的变更和修改。所以，所附权利要求意欲解释为包括优选实施例以及落入本发明范围的所有变更和修改。Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.
显然，本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和范围。这样，倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些改动和变型在内。Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.
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| CN117147091A (en) | 2023-12-01 |
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