CN114166513B - An observable high pressure calibration flame chamber - Google Patents

Abstract

The invention relates to an observable high-pressure calibration flame cavity, which comprises a high-pressure combustion chamber, an upper flange, a lower flange, three observation windows, a combustion furnace supporting platform, a combustion furnace, a plurality of bearing posts, a plurality of air inlet pipes, a swing arm type igniter, an exhaust pipe and a back pressure valve, wherein the upper flange and the lower flange are respectively arranged at the upper end and the lower end of the combustion chamber in a sealing way; the three observation windows are respectively and hermetically arranged on three outer side walls of the high-pressure combustion chamber; the combustion furnace supporting table is fixed on the lower flange, and the combustion furnace is fixed on the combustion furnace supporting table; the air inlet pipe is welded in a preset hole on the lower flange; the rocker arm igniter is mounted on the fourth side wall of the high pressure combustion chamber to be adjacent to the burner during ignition and to be remote from the flame of the burner during combustion.

Description

An observable high pressure calibration flame chamber

technical field

The invention relates to the field of high-pressure combustion research, in particular to an observable high-pressure calibration flame cavity.

Background technique

High-pressure combustion phenomena are common in practical engineering applications such as internal combustion engines, gas turbines, and detonation engines. At present, the design work for high-pressure model combustion chambers is focused on providing experimental conditions close to real working conditions. . On the other hand, direct flame observation and spectroscopic measurements for these high-pressure combustion phenomena also face many challenges. For example, most of the model combustion chambers are designed for specific applications. The burner body and the high-pressure chamber are designed in one piece, so the structure of the flame nozzle and the intake pipeline cannot be easily changed. The high-pressure flame has many variable parameters, and the experimental measurement results carried out for it are difficult to verify its accuracy. In addition, from the perspective of spectroscopy research, a stable, continuous and predictable high-pressure flame device is also very important.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an engine plume field velocity and temperature synchronous measurement system to solve the above problems. For this reason, the technical scheme adopted in the present invention is as follows:

An observable high-pressure calibration flame cavity, which can include a high-pressure combustion chamber, an upper flange, a lower flange, three observation windows, a combustion furnace support, a combustion furnace, a plurality of load-bearing columns, a plurality of air intake pipes, and a rocker arm type igniter, exhaust pipe and back pressure valve, wherein the upper flange and the lower flange are respectively sealed and installed on the upper and lower ends of the high-pressure combustion chamber, and the upper surface of the upper flange is provided with a cooling liquid groove, The cooling liquid tank is covered with a sealing groove cover, and the sealing groove cover has a liquid inlet and a liquid outlet, and the lower surface of the upper flange is provided with a conical recess; the three observation windows are sealed respectively Installed on the three outer side walls of the high-pressure combustion chamber, the combustion furnace support is fixed on the lower flange, the combustion furnace is fixed on the combustion furnace support, and the multiple load-bearing columns are vertical It is placed upright and the upper end is fixed on the lower flange, the intake pipe is welded in the preset hole on the lower flange; the rocker type igniter and the exhaust pipe are installed on the first part of the high-pressure combustion chamber. on four side walls; and the back pressure valve is mounted on the exhaust pipe.

In a preferred embodiment, the number of the load-bearing columns is three, and the load-bearing columns have a central through hole to be fixed to the lower flange by screws.

In a preferred embodiment, there are six intake pipes in total.

In a preferred embodiment, the combustion furnace supporting platform includes an upper platform, a lower platform and a connecting column between the upper platform and the lower platform, wherein the lower platform is fixed on the lower platform with screws On the upper platform, the combustion furnace is fixed on the upper platform with screws.

In a preferred embodiment, the observation window includes a window flange, a cylindrical lens and a pressure ring, the window flange is sealingly mounted on the side wall of the high-pressure combustion chamber, and the cylindrical lens is sealed by the pressure ring. The ring and the window flange are sealingly clamped.

In a preferred embodiment, the material of the lens is sapphire, and its inner mirror surface has an inclination of 10°.

In a preferred embodiment, an O-ring is used for buffer treatment between the lens and the pressing ring; and Teflon is used for sealing between the lens and the window flange.

In a preferred embodiment, the rocker type igniter comprises a cylindrical electrode, a rocker arm and an electrode holder, the electrode holder is sealingly mounted on the fourth side wall of the high pressure combustion chamber, the rocker arm A rotatable seal is mounted in the center of the electrode holder, and the electrode is secured to the inner end of the rocker arm for proximate the burner when ignited and away from the burner flame when burning.

In a preferred embodiment, the exhaust pipe is sealingly mounted on the electrode holder, just above the electrode, and the back pressure valve is mounted on the outside of the exhaust pipe.

In a preferred embodiment, between the high pressure combustion chamber and the upper flange, between the high pressure combustion chamber and the lower flange, between the high pressure combustion chamber and the observation window and the Teflon is used for sealing between the high pressure combustion chamber and the electrode support.

The invention has fewer parts, simple installation steps, and is not prone to failure; the invention has three perspective windows on the side of the high-pressure combustion chamber, which enables users to clearly observe the conditions in the cavity, and the window is made of sapphire material, which can prevent visible light to The transmittance of the light source in the mid-infrared band is high, which can be used for high-speed camera shooting, absorption spectrum, fluorescence spectrum and other spectral measurement research; a load-bearing column is set under the high-pressure combustion chamber, which is convenient for laying the intake pipe, and the burner in the high-pressure combustion chamber can be replaced, which is convenient for research. Various forms of calibrated flame systems; rocker igniter can subtly solve the problem of igniter sealing and improve the durability of the igniter; the lower surface of the upper flange adopts a conical design to effectively avoid condensation during high-pressure flame operation Water falling into the stove top causes flameout problems.

Description of drawings

Fig. 1 is the structural representation of a kind of observable high pressure calibration flame cavity of the present invention;

Fig. 2 is the structural representation of the upper flange of the observable high-pressure calibration flame chamber shown in Fig. 1;

Fig. 3 is the structural schematic diagram of the observation window of the observable high-voltage calibration flame cavity shown in Fig. 1;

FIG. 4 is a schematic structural diagram of the igniter, the exhaust pipe and the back pressure valve of the observable high-pressure calibration flame chamber shown in FIG. 1 .

Detailed ways

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so as to more clearly understand the objects, features and advantages of the present invention. It should be understood that the embodiments shown in the accompanying drawings are not intended to limit the scope of the present invention, but are only intended to illustrate the essential spirit of the technical solutions of the present invention.

In the following description, for the purpose of illustrating various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. One skilled in the relevant art will recognize, however, that the embodiments may be practiced without one or more of these specific details. In other instances, well-known devices, structures and techniques associated with this application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

Unless the context requires otherwise, throughout the specification and claims, the word "comprising" and variations thereof, such as "comprising" and "having", should be construed in an open, inclusive sense, i.e., should be interpreted as "including, but not limited to".

Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of "in one embodiment" or "in an embodiment" in various places throughout the specification are not necessarily all referring to the same embodiment. Additionally, the particular features, structures or characteristics may be combined in any manner in one or more embodiments.

As used in this specification and the appended claims, the singular forms "a" and "the" include plural referents unless the context clearly dictates otherwise. It should be noted that the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise.

In the following description, in order to clearly show the structure and working mode of the present invention, many directional words will be used for description, but "front", "rear", "left", "right", "outer", "inner" should be "," "outward", "inward", "up", "down" and other words are to be understood as convenient terms, and should not be understood as limiting words.

Furthermore, the terms "horizontal", "vertical", "overhanging" etc. do not imply that a component is required to be absolutely horizontal or overhang, but rather may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal than "vertical", it does not mean that the structure must be completely horizontal, but can be slightly inclined.

In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "arrangement", "installation", "connection" and "connection" should be interpreted in a broad sense, for example, it may be a fixed connection, It can also be a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or the internal communication between the two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood in specific situations.

As shown in Figures 1 and 2, an observable high-pressure calibration flame chamber may include a high-pressure combustion chamber 1, an upper flange 2, a lower flange 3, three observation windows 4, a combustion furnace support 5, and a combustion furnace 6 , a plurality of load-bearing columns 7 , a plurality of intake pipes 8 , an igniter 9 , an exhaust pipe 10 and a back pressure valve 11 . Wherein, the upper flange 2 and the lower flange 3 are sealed and installed on the upper and lower ends of the combustion chamber 1 respectively. The upper surface of the upper flange 2 is provided with a cooling liquid tank 21, which can be loaded with flowing cooling liquid; the cooling liquid tank 21 is covered with a sealing groove cover 22, and the sealing groove cover 22 has a liquid inlet and a liquid outlet, and the cooling liquid Inflow from the liquid inlet and outflow from the liquid outlet can effectively solve the problem of deformation of the upper flange due to high temperature. The cooling liquid tank 21 may be provided with a conical recess 23 on the lower surface of the upper flange 2, which can effectively prevent the problem of flameout caused by dripping of condensed water into the combustion furnace. The lower flange 3 is horizontally fixed on the upper end of the bearing column 7 . Specifically, the number of the load-bearing columns 7 is three, which are separated by 60 degrees and placed vertically. The bearing column 7 has a central through hole to be fixed to the lower flange 3 by screws.

The three observation windows 4 are sealed and installed on the three outer side walls of the high-pressure combustion chamber 1 respectively, so as to enable the user to clearly observe the conditions in the cavity (ie, the high-pressure combustion chamber 1 ). Specifically, as shown in FIG. 3 , the observation window 4 includes a window flange 41 , a cylindrical lens 42 and a pressure ring 43 , wherein the window flange 41 is sealedly installed on the side wall of the high-pressure combustion chamber 1 , for example, using polytetrafluoroethylene Sealed with vinyl fluoride. The cylindrical lens 42 is sealed and clamped by the pressing ring 43 and the window flange 41 . Preferably, an O-ring is used between the lens 42 and the pressing ring 43 for buffering. Teflon is used for sealing between the lens 42 and the window flange 41 . The material of the lens 42 is sapphire, which can pass through the visible light to the mid-infrared light source, so that high-speed imaging and measurement methods such as infrared absorption spectroscopy and laser-induced fluorescence spectroscopy can be simultaneously realized. The lens 42 can be replaced to solve the contamination of the lens mirror surface by combustion residues; and the inner mirror surface thereof is inclined by 10° to reduce the reflection effect of the lens 42 .

The burner support 5 is fastened (eg by screws) to the lower flange 3 . The burner 6 is fastened (eg by screws) to the burner support 5 . Specifically, the combustion furnace support 5 includes an upper platform, a lower platform, and a connecting column located between the upper platform and the lower platform. The lower platform is fixed on the lower flange 3 with screws, and the combustion furnace 6 is fixed on the upper platform with screws.

A plurality of air intake pipes 8 are welded in preset holes on the lower flange 3 to feed gases of different types and flow rates into the combustion furnace 6 to achieve the required flame shape and facilitate experimental research. In a specific embodiment, there are six intake pipes 8 in total.

A rocker igniter 9 is installed on the fourth side wall of the high pressure combustion chamber 1 to be close to the burner 6 when igniting and away from the flame of the burner 6 when burning. The rocker igniter uses electrode ignition. The exhaust pipe 10 is installed on the fourth side wall of the high pressure combustion chamber 1 . The back pressure valve 11 is installed on the exhaust pipe 10 to ensure stable pressure in the combustion chamber and smooth flame. Specifically, as shown in FIG. 4 , the rocker type igniter 9 may include a cylindrical electrode 91 , a rocker arm 92 and an electrode holder 93 , wherein the electrode holder 93 is sealingly mounted on the fourth side wall of the high-pressure combustion chamber 1 . The rocker arm 92 is rotatably and sealingly mounted on the center of the electrode holder 93 . Electrodes 91 are fixed to the inner ends of rocker arms 92 . In the illustrated embodiment, the rocker arm 92 is partially horizontal, vertical and horizontal within the high-pressure combustion chamber 1 . During ignition, when the electrode 91 is rotated to a position close to the flame port of the combustion furnace by the rocker arm 92, for example, when the electrode 91 is rotated 180 degrees from the initial position shown in FIG. Combustible gas; during the combustion process, when the electrode 91 is rotated to a position away from the combustion furnace through the rocker arm 92, for example, when it is rotated 90 degrees from the initial position, to prevent the flame from damaging the electrode, so as not to interfere with the flame itself and prolong the ignition device life. The exhaust pipe 10 is sealed and installed on the electrode support 93, and is located directly above the electrode 91, and the back pressure valve 11 is installed on the outer side of the exhaust pipe 10 to facilitate the operation.

Preferably, between the high-pressure combustion chamber 1 and the upper flange 2 , between the high-pressure combustion chamber 1 and the lower flange 3 , between the high-pressure combustion chamber 1 and the observation window 4 , and between the high-pressure combustion chamber 1 and the electrode support 92 are Sealed with PTFE to ensure a good seal in high temperature environments.

In the invention, a cooling liquid tank is installed on the upper surface of the upper flange, so as to realize the thermal balance of the device and ensure the stable operation of the calibration flame for a long time; and the lower surface of the upper flange adopts a conical surface design to ensure that the cooling water does not flow back to the flame furnace surface. trigger a flameout. The optical window of the invention is designed with sapphire glass, and can pass through the visible light to the mid-infrared band light source, so it can simultaneously realize high-speed imaging and research on measurement methods such as infrared absorption spectrum and laser-induced fluorescence spectrum. The electrode ignition has a rocker-arm design that leaves the flame area after ignition, thereby not disturbing the flame itself and prolonging the life of the ignition. Compared with the prior art, the present invention can maintain a stable flame under higher air pressure, which is convenient for users to capture a clear flame shape and carry out various spectral measurement studies, and provides experimental support for analyzing high-pressure flame characteristics and high-pressure laser spectral characteristics. .

The preferred embodiments of the present invention have been described in detail above, but it should be understood that those skilled in the art can make various changes or modifications to the present invention after reading the above teaching contents of the present invention. Such equivalents also fall within the scope defined by the claims appended hereto.

Claims (9)

1. An observable high-pressure calibration flame cavity is characterized in that: comprising a high-pressure combustion chamber (1), an upper flange (2), a lower flange (3), three observation windows (4), a combustion furnace support A table (5), a combustion furnace (6), a plurality of load-bearing columns (7), a plurality of intake pipes (8), a rocker igniter (9), an exhaust pipe (10) and a back pressure valve (11), Wherein, the upper flange (2) and the lower flange (3) are sealed and installed on the upper and lower ends of the high-pressure combustion chamber (1) respectively, and the upper surface of the upper flange (2) is provided with a cooling liquid groove ( 21), the cooling liquid tank (21) is covered with a sealing groove cover (22), the sealing groove cover (22) is provided with a liquid inlet and a liquid outlet, and the lower surface of the upper flange (2) A conical pit (23) is provided; the three observation windows (4) are respectively sealed and installed on the three outer side walls of the high-pressure combustion chamber (1), and the combustion furnace bracket (5) is fixed on the On the lower flange (3), the combustion furnace (6) is fixed on the combustion furnace support (5), the plurality of load-bearing columns (7) are placed vertically and the upper ends are fixed on the lower flange (3), the intake pipe (8) is welded in a preset hole on the lower flange (3); the rocker type igniter (9) is installed on the first part of the high-pressure combustion chamber (1). on four side walls to be close to the burner (6) when igniting and away from the flame of the burner (6) when burning; the exhaust pipe (10) is installed in the high-pressure combustion chamber (1) ) on the fourth sidewall of the 92) and an electrode support (93), the electrode support (93) is sealingly mounted on the fourth side wall of the high-pressure combustion chamber (1), and the rocker arm (92) is rotatably and sealingly mounted on the The center of the electrode holder (93), the electrode (91) is fixed on the inner end of the rocker arm (92), so as to be close to the combustion furnace (6) during ignition and away from the combustion furnace (6) during combustion The flame of the burner (6). 2. An observable high-voltage calibration flame cavity according to claim 1, characterized in that: the number of the load-bearing columns (7) is three, and the load-bearing columns (7) have a central through hole to It is fixed to the lower flange (3) by means of screws. 3. An observable high-pressure calibration flame cavity according to claim 1, characterized in that: there are six air intake pipes (8). 4. An observable high-voltage calibration flame cavity according to claim 1, characterized in that: the combustion furnace support (5) comprises an upper platform, a lower platform, and a platform located on the upper platform and the lower platform The connecting column between the two, wherein the lower platform is fixed on the lower flange (3) with screws, and the combustion furnace (6) is fixed on the upper platform with screws. 5. The observable high-voltage calibration flame cavity according to claim 1, wherein the observation window (4) comprises a window flange (41), a cylindrical lens (42) and a pressure ring (43) ), the window flange (41) is sealingly mounted on the side wall of the high-pressure combustion chamber (1), and the cylindrical lens (42) is formed by the pressure ring (43) and the window flange (41) ) seal clamping. 6 . The observable high-voltage calibration flame cavity according to claim 5 , wherein the material of the lens ( 42 ) is sapphire, and the inner mirror surface thereof has an inclination of 10°. 7 . 7. An observable high-voltage calibration flame cavity according to claim 5, characterized in that: an O-ring is used for buffering between the lens (42) and the pressure ring (43); and the lens Teflon is used for sealing between (42) and the window flange (41). 8. An observable high-voltage calibration flame chamber according to claim 1, characterized in that: the exhaust pipe (10) is sealed and installed on the electrode support, and is located in the positive direction of the electrode (91). above, and the back pressure valve (11) is installed on the outside of the exhaust pipe (10). 9. An observable high-pressure calibration flame cavity according to claim 8, characterized in that: between the high-pressure combustion chamber (1) and the upper flange (2), the high-pressure combustion chamber ( 1) between the lower flange (3), between the high pressure combustion chamber (1) and the observation window (4), and between the high pressure combustion chamber (1) and the electrode support (93) Both are sealed with Teflon.

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