CN106347702A - Air injection guide plate - Google Patents

Abstract

The invention discloses an air jet deflector, which comprises a honeycomb structure layer filled with phase change materials and a chaotic structure flow channel layer with cooling water circulation, the upper and lower surfaces of the honeycomb structure are metal sheets, and the chaotic structure flow channel layer is set Below the honeycomb structure layer, grooves with regular distribution are arranged in the cooling water circulation channel of the chaotic structure flow channel layer, and microcapsule phase change materials are added to the cooling water solution. The air jet deflector of the present invention greatly improves the heat transfer speed and efficiency, accelerates the heat exchange between the middle of the flow channel and the fluid near the wall surface, and greatly enhances the heat exchange effect.

Description

A jet deflector

technical field

The invention relates to an air jet deflector in the aviation field, in particular to an air jet deflector which utilizes phase transformation heat and has a chaotic flow channel and a honeycomb structure designed to increase heat dissipation speed and heat exchange performance.

Background technique

With the advancement of modern electronics and optics and other technologies, as well as the improvement of requirements for aerospace missions, a series of high-power components with ultra-high heat flux density, short-time and intermittent work have emerged, such as laser weapons, traveling wave tubes and motorized components. flight control systems, etc. The short-term peak heat generation of this type of system greatly exceeds the average heat generation. For example, the combined remote sensor on the spaceborne radar has a peak radiation power greater than 2000W, and the peak working time accounts for 20% of the total time, while the average power is less than 600W. . Traditionally, there have been two thermal designs for such systems: designing for peak power conditions and designing for average power conditions. The advantage of the former is that it can ensure that the temperature of the electronic equipment can be kept within the design value during the whole operation process, but its disadvantage is that the weight and volume of the system are too large, the energy consumption is large, and the capacity is excessive in most cases; the design of the latter The system will have a smaller volume and weight, but when running under peak power conditions, the electronic equipment will be overheated or even burned due to insufficient heat dissipation, which will significantly reduce its thermal reliability and greatly shorten the life of the electronic equipment. service life.

The jet deflector can guide the high-temperature gas flow to the outboard or upward. In order to reduce the scorching temperature of the gas flow, there are grid-shaped water pipes for the cooling water to circulate behind the jet deflector. When the deflector is working, it is generally cooled by air or water, and the temperature is required to drop rapidly to the extent that the tire of the next aircraft to be flown rolling on it will not be damaged. At present, the heat transfer of conventional deflectors mainly depends on the thermal conductivity of metal materials. However, due to the limitation of the thermal conductivity of the material itself, the heat of the deflectors cannot be dissipated in time, making the plates very easy to burn and reducing the use of deflectors. On the other hand, because the heat cannot be transferred in time, it will affect the take-off of the next aircraft, prolong the take-off time of the aircraft, and affect the combat effectiveness of the aircraft carrier. Therefore, in order to avoid the excess capacity of the system and at the same time, the system can dissipate the high-temperature heat efficiently, the existing jet deflector is optimized and improved to enhance the heat dissipation effect of the deflector, and at the same time improve its structural strength to adapt to its high temperature , high-speed jet working environment, urgently need to find a new type of high-efficiency deflector device.

Since the phase change material can absorb or release a large amount of latent heat during the phase change process, it has the advantages of high heat storage density, constant temperature control, and easy control. It can be used in the fields of heat transfer and temperature control. Inspired by research and application, the present invention fills the phase change material in the regular hexagonal metal honeycomb structure. On the one hand, the honeycomb structure can enhance the structural strength of the deflector, and at the same time, the filling of the phase change material strengthens the heat transfer effect; recent studies have shown that , Chaotic convection can significantly strengthen convection and heat transfer, and can be used to design compact, high-performance mixing and heat transfer equipment. The present invention uses a chaotic structure flow channel in the lower water circulation pipeline to quickly take away heat and accelerate heat dissipation.

Contents of the invention

In order to solve the problems that the existing deflectors rely on metal materials to conduct heat, the heat conduction mode is single, the heat transfer efficiency is low, and the structural strength is insufficient. flow plate device. Because the deflector device relies on the phase change of the phase change material to absorb the heat of the high-temperature heat flow, the heat transfer rate is increased, and the application of the metal honeycomb structure enhances the structural strength of the deflector, and the use of chaotic structure flow channels is accelerated. Convection and heat exchange speed, in short, the deflector greatly improves the heat exchange efficiency while enhancing the structural strength, achieves the purpose of efficient heat exchange, and better adapts to the working environment of high temperature and high speed jet flow.

In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:

An air jet deflector, characterized in that: it includes a honeycomb structure layer filled with phase change materials and a chaotic structure flow channel layer with cooling aqueous solution circulation, the upper and lower surfaces of the honeycomb structure are metal sheets, and the chaotic structure flow channel layer is set Below the honeycomb structure layer, grooves with regular distribution are arranged in the cooling water circulation channel of the chaotic structure flow channel layer, and microcapsule phase change materials are added to the cooling water solution.

The sandwich layer of the honeycomb structure layer is a series of hexagons made of metal materials, the upper and lower surfaces of the sandwich layer are thin metal sheets, and the chaotic structure flow channel layer is arranged side by side on the honeycomb structure layer below.

The grooves are herringbone grooves, and the herringbone grooves are periodically distributed.

The intersection angle of the herringbone groove is 150°

In the first half cycle, the long side of the herringbone groove is on the top, and the short side of the herringbone groove is on the bottom; in the second half cycle, the short side of the herringbone groove is on the top, and the long side of the herringbone groove is on the bottom; The number m of the zigzag grooves satisfies 2≤m≤20, and the water flows in from the upper part of the chaotic structure channel layer and flows out from the lower part.

The phase change material is a solid-liquid phase change material. The solid-liquid phase change energy storage device has good constant temperature and huge latent heat of phase change, which can effectively solve the heat dissipation problem of short-term and periodic high-power electronic devices. Aerospace and microelectronics and other systems have been more and more widely used. The solid-liquid phase change material used is a paraffin organic phase change material because of its high energy storage density, stable chemical properties, low price, and wide range of phase change temperatures. When high-temperature gas is sprayed onto the upper metal surface of the deflector, the heat is conducted to the phase-change material in the honeycomb structure, and the phase-change material absorbs heat, and the temperature gradually rises to reach phase change. Change temperature, the phase change material undergoes a phase change, and the temperature is maintained within a certain temperature range while absorbing a large amount of heat.

The sandwich layer of the nest structure is a series of hexagons made of metal materials. The upper and lower surfaces of the sandwich layer are thin metal sheets. Studies have shown that the building structure of regular hexagons has the highest degree of adhesion and the simplest materials required. , The usable space is the largest, and the same amount of metal material can make the honeycomb structure have the largest volume. Filling the phase change material in the honeycomb structure can also greatly improve the thermal conductivity of the phase change material, At the same time, compared with other sandwich structures, the honeycomb structure has higher strength and rigidity, and the structural efficiency is also greatly improved.

The flow channels of chaotic structure are arranged side by side under the honeycomb structure, and the flow channels of chaotic structure are arranged according to the length and width of the honeycomb structure. Distribution, the crossing angle of the grooves is 150°, the long side of the first half cycle is on the top, the short side is on the bottom, the second half of the cycle is on the short side, and the long side is down, the number of grooves in each half cycle m Satisfying 2≤m≤20, the cooling water solution flows in from the upper part of the chaotic structure flow channel, and flows out from the lower part, and the arrangement of the herringbone grooves on the lower wall of the chaotic structure flow channel can make the fluid generate a lateral flow in the flow channel Flow, the periodic distribution of grooves can periodically change the rotational flow center of the fluid, and then form a stable chaotic convection. The heat of the high-temperature gas is transferred through the honeycomb structure in the upper layer to the chaotic structure flow channel in the lower layer, and the cooling water solution will take away the heat stored in the honeycomb structure when flowing in the chaotic structure flow channel , to reduce its temperature, and then the phase change material is solidified, so that it can continuously absorb the heat of the high-temperature gas from the outside, and the cooling water solution forms chaotic convection in the chaotic structure flow channel, and this flow state It can improve the mixing between the fluids, and promote the heat exchange between the fluid in the middle of the flow channel and the fluid near the wall, thereby enhancing the mixing and heat transfer, but without significantly increasing the pressure drop.

Add microcapsule phase change materials to the cooling water solution. Microcapsule technology is a technology that uses film-forming materials to coat solid or liquid to form tiny particles. The core material is paraffin organic phase change materials, and the wall material is polystyrene. Ethylene and paraffin organic phase change materials have high energy storage density, stable chemical properties, low price, and a wide range of phase change temperatures. Polystyrene has excellent thermal insulation and shock resistance. The microcapsule phase change material introduces microcapsule technology into the phase change material, which increases the heat transfer area, prevents the reaction between the phase change material and the surrounding substances, and improves the heat transfer efficiency.

Beneficial effect:

The air jet deflector of the present invention is filled with solid-liquid phase change material in the honeycomb structure of the upper layer of the deflector, the phase change process occurs within a certain temperature range, and the latent heat of phase change is much higher than the heat absorbed by sensible heat, which greatly improves The heat transfer speed and efficiency are improved; the honeycomb structure made of metal materials can greatly improve the thermal conductivity of the phase change material, and its hexagonal structure can make it have the largest volume, while it has high strength and The rigidity and structural efficiency are also greatly improved; the lower wall of the chaotic structure flow channel in the lower layer adopts periodically arranged herringbone grooves, which can make the fluid generate stable chaotic convection in it, accelerate the heat exchange between the middle of the flow channel and the fluid near the wall, and greatly The heat exchange effect is greatly enhanced; the cooling aqueous solution is filled with microcapsule phase change materials, the application of microcapsule technology increases the heat exchange area, controls the volume change of phase change materials during phase change, and improves the use efficiency of phase change materials.

Description of drawings

Figure 1 The overall structure of the deflector;

Fig. 2 The honeycomb structure diagram of the upper layer of the deflector;

Fig. 3 flow channel diagram of chaotic structure in the lower layer of deflector;

Fig. 4 The structure diagram of the lower wall surface of the chaotic structure flow channel;

Among them, 1. The upper honeycomb structure; 2. The lower chaotic structure flow channel; 3. Metal sheet; 4. Honeycomb wall; 5. Honeycomb cavity; 6. Herringbone groove.

detailed description

Carry out further detailed description below in conjunction with accompanying drawing:

Figure 1 shows the overall structure of the deflector of the present invention. An air jet deflector is composed of an upper layer honeycomb structure 1 and a lower layer chaotic structure flow channel 2 . When the high-temperature gas P is sprayed onto the upper part of the deflector, the heat is transferred to the upper honeycomb structure 1 through the thin metal plate 3, and the phase change material in the honeycomb cavity 5 absorbs a large amount of heat quickly, and the temperature rises within a certain range, and the chaotic structure of the lower layer flows The cooling water solution flows in the channel 2, which flows continuously from top to bottom, as shown by the small arrow in Figure 1, to absorb the heat accumulated in the upper honeycomb structure 1, so that the deflector can work continuously.

Figure 2 shows the upper honeycomb structure diagram of the deflector. The upper honeycomb structure 1 is composed of a metal sheet 3, a honeycomb wall 4 and a honeycomb cavity (5. The injected high-temperature gas is transmitted to the inside of the honeycomb structure through the metal sheet 3, and the honeycomb cavity 5 is a regular hexagonal structure, which can have the largest accommodation space under the same amount of production materials, and the regular hexagonal structure has high structural strength, which can adapt to the working environment of high temperature and high-speed jet flow. The phase change material inside the cavity It is a solid-liquid phase change material. The solid-liquid phase change energy storage device has good constant temperature and huge latent heat of phase change, which can effectively solve the heat dissipation problem of short-term and periodic high-power electronic devices. The solid-liquid phase change used The material is paraffin organic phase change material, because of its high energy storage density, stable chemical properties, low price and wide range of phase change temperature.

Figure 3 shows the flow path diagram of the chaotic structure in the lower layer of the deflector. The number of flow channels can be arranged according to the width of the upper honeycomb structure. The number of flow channels shown in Figure 3 is n=3, and the lower wall of the chaotic structure flow channel is chiseled. There are a certain number of herringbone grooves 6, and the water flow direction is shown by the arrow in Fig. 3, flowing in from the upper part of the chaotic structure flow channel and flowing out from the lower part. Microcapsule phase change material is added to the cooling water solution. The core material of the capsule is paraffin organic phase change material, and polystyrene is used as the wall material. Microcapsule technology is introduced into the cooling water solution, which increases the heat transfer area and prevents phase change. The reaction of the material with the surrounding substances improves the heat transfer efficiency.

Figure 4 shows the structure diagram of the lower wall surface of the chaotic structure flow channel. The herringbone grooves 6 in the figure are distributed at periodic intervals. The length of a cycle is C, and the crossing angle of the grooves is 150°. In the first half cycle C1 The long side 61 of the groove is on the top, the short side 62 is on the bottom, the short side of the groove in the second half cycle C2 is on the top, and the long side is on the bottom, the number m of grooves in each half cycle satisfies 2≤m≤20, in the chaotic structure flow channel The arrangement of the herringbone grooves on the lower wall can make the fluid flow laterally in the flow channel, and the periodic distribution of the grooves can periodically change the rotational flow center of the fluid, thereby forming a stable chaotic convection.

Claims (5)

1. An air jet deflector, characterized in that: comprise a honeycomb structure layer filled with phase change material and a chaotic structure flow channel layer with cooling aqueous solution circulation, the upper and lower surfaces of the honeycomb structure are thin metal plates, and the chaotic structure flow channel The layer is arranged under the honeycomb structure layer, and grooves with regular distribution are arranged in the cooling water circulation channel of the chaotic structure flow channel layer, and microcapsule phase change materials are added to the cooling water solution. 2. The air jet deflector according to claim 1, characterized in that: the sandwich layer of the honeycomb structure layer is a series of hexagons made of metal materials, and the upper and lower surfaces of the sandwich layer are thinner. The thin metal plate, the chaotic structure flow channel layer is arranged side by side under the honeycomb structure layer. 3. The jet deflector according to claim 2, characterized in that: the grooves are herringbone grooves, and the herringbone grooves are periodically distributed. 4. The jet deflector according to claim 3, characterized in that: the intersecting angle of the herringbone grooves is 150°. 5. The air jet deflector according to claim 4, characterized in that: the long side of the herringbone groove in the first half cycle is on the top, and the short side of the herringbone groove is down; the short side of the herringbone groove in the second half cycle is The side is on the top, and the long side of the herringbone groove is on the bottom; the number m of the herringbone grooves in each half period is sufficient, and the water flows in from the upper part of the chaotic structure flow channel layer and flows out from the lower part.