阅读说明：本技术 一种双模送进结构及基于该结构的模型热考核方法 (Dual-mode feeding structure and model thermal assessment method based on same ) 是由 陈智铭 阎宪祥 苏有为 于 2020-04-10 设计创作，主要内容包括：本发明涉及一种双模送进结构及基于该结构的模型热考核方法,双模送进结构包括导向条、双模支架、电动导轨、控制器和固定支架。双模支架是一个设置有两个安装孔位的可以同冷却水的支架,底端与电动导轨连接,在电动导轨的作用下可往复运动。固定支架与地面固定,顶部与电动导轨连接。控制器控制电动导轨移动,可以手动控制也可以根据事先设定运动方案自动运行。导向条一端固定在电弧风洞出口,另一端与双模支架通过凹槽方式连接。基于该结构本发明还提出模型热考核方法,本发明可以应用于高速飞行器防隔热材料气动热地面模拟试验中高精度测量需求。(The invention relates to a dual-mode feeding structure and a model thermal assessment method based on the same. The double-mode support is a support which is provided with two mounting hole positions and can be used for cooling water, the bottom end of the double-mode support is connected with the electric guide rail, and the double-mode support can reciprocate under the action of the electric guide rail. The fixed support is fixed with the ground, and the top is connected with the electric guide rail. The controller controls the electric guide rail to move, and the electric guide rail can be manually controlled or automatically operated according to a preset motion scheme. One end of the guide strip is fixed at an outlet of the electric arc wind tunnel, and the other end of the guide strip is connected with the double-mode support in a groove mode. The invention further provides a model thermal assessment method based on the structure, and the method can be applied to high-precision measurement requirements in a high-speed aircraft thermal insulation material prevention aerodynamic surface simulation test.)

1. A dual mode feeding structure, comprising: the device comprises a dual-mode bracket (1), an electric guide rail (2), a fixed bracket (3), a guide strip (4) and a controller (5);

Bimodulus support (1) is through being used for direction and spacing gib block (4) and wind-tunnel exit linkage, bimodulus support (1) bottom is connected with electronic guide rail (2), horizontal migration under the drive of electronic guide rail (2), and install on fixed bolster (3) electronic guide rail (2), and fixed bolster (3) are installed subaerial, and electronic guide rail (2) work is controlled in controller (5), and then drive bimodulus support (1) horizontal migration.

2. A dual mode feeding structure according to claim 1, wherein: the electric guide rail (2) is parallel to the guide strip (4).

3. A dual mode feeding structure according to claim 1, wherein: a pipeline structure is arranged in the double-mode support (1), so that the double-mode support (1) can dissipate heat in a water cooling mode.

4. A dual mode feeding structure according to claim 1, wherein: the electric guide rail (2) under the automatic or manual control of the controller (5) pushes the dual-mode bracket (1) to translate along the guide strip (4) at the wind tunnel outlet.

5. A dual mode feeding structure according to claim 1, wherein: the guide strip (4) is connected with the double-mold support (1) in a groove mode, and the movement direction of the double-mold support (1) is limited through a groove structure.

6. the dual-mode feeding structure of claim 3, wherein the dual-mode bracket (1) is provided with two mounting holes for the test models, the two test models can be simultaneously mounted, and the two mounting holes for the test models are spaced apart by a distance D > (1.2 × model characteristic length L1 of the model and the characteristic length L2 of the nozzle).

7. A dual mode feeding structure according to claim 6, wherein: the characteristic length of the spray pipe is the characteristic length of the wind tunnel outlet, and the electric arc wind tunnel outlet is of a spray pipe-shaped structure.

8. the dual-mode feeding structure of claim 7, wherein the vertical distance S1 between the electric guide rail (2) and the wind tunnel outlet is greater than 3 × (model characteristic length L1 + nozzle characteristic length L2)/2.

9. the dual-mode feeding structure of claim 7, wherein the distance between the electric guide rail (2) and the wind tunnel outlet is S2> (model characteristic length L1 + nozzle characteristic length L2)/2.

10. A method for thermal qualification of a model implemented by a dual-mode feeding structure according to claim 1, characterized by the steps of:

(1) When a test is started, before the wind tunnel operation parameters reach dynamic balance, placing the two models at corresponding positions on the dual-mode bracket;

(2) The controller translates the two models to an area outside the wind tunnel outlet;

(3) When the wind tunnel operation parameters are kept in dynamic balance, the controller translates the model A on the dual-mode bracket to the wind tunnel outlet to receive thermal examination; meanwhile, the dual-mode bracket performs heat dissipation and cooling through water cooling;

(4) After the test purpose is achieved, the model A is translated to the outlet of the wind tunnel through the controller, the model B is translated to the outlet of the wind tunnel, the thermal examination is received, and the test is stopped after the test purpose is achieved; the time period of the model A and the model B for carrying out the thermal assessment test is selected as the time period when the dynamic balance parameter fluctuation is lower than the preset threshold value in the operation process of the electric arc wind tunnel.

Technical Field

The invention relates to a dual-mode feeding structure and a model thermal assessment method based on the structure, which are applied to a spacecraft thermal protection material ground assessment test.

Background

When the high-speed aircraft outer heat-proof material is used for carrying out a thermal protection ground simulation test, high-temperature high-speed airflow formed by heating air by electric arcs in an electric arc wind tunnel flows over the surface of the heat-proof material to achieve the purpose of heating examination.

In the operation process of the electric arc wind tunnel, due to slow ablation of electrodes, the heat exchange balance time of cooling equipment is long, so that the parameters of high-temperature and high-speed airflow obtained under the same input condition in multiple tests have certain fluctuation, however, the fluctuation of main index parameters generally does not exceed +/-5%, the requirement of conventional heat-proof material examination can be met, and the fluctuation range of main parameters of the electric arc wind tunnel cannot meet the requirement of a material fine comparison test with a similar structure.

Disclosure of Invention

The technical problem of the invention is solved: the dual-mode feeding support overcomes the defects of the prior art, can switch and examine two models in one test process, improves the test efficiency and the test precision so as to meet the high-precision test requirement of the current heat-proof material, and is applied to the high-precision measurement requirement in the high-speed aircraft heat-proof material aerodynamic surface simulation test.

The technical scheme of the invention is as follows:

A dual mode feeding structure comprising: the device comprises a dual-mode bracket, an electric guide rail, a fixed bracket, a guide strip and a controller;

Bimodulus support is through being used for direction and spacing gib block and wind-tunnel exit linkage, and bimodulus support bottom is connected with electronic guide rail, and horizontal migration under the drive of electronic guide rail, electronic guide rail installs on fixed bolster, and fixed bolster installation is subaerial, and the work of electronic guide rail of controller control, and then drive bimodulus support horizontal migration.

Furthermore, the electric guide rail is parallel to the guide strip.

Further, the double-mold support is internally provided with a pipeline structure, so that the double-mold support can dissipate heat in a water cooling mode.

Further, the electric guide rail under the automatic or manual control of the controller pushes the dual-mode support to translate along the guide strip at the wind tunnel outlet.

Furthermore, the guide strip is connected with the double-mold support in a groove mode, and the movement direction of the double-mold support is limited through a groove structure.

furthermore, two test model mounting hole sites are arranged on the dual-mode support, two test models can be mounted at the same time, and the distance between the two test model mounting hole sites is D > (1.2 multiplied by the characteristic length L1 of the model and the characteristic length L2 of the spray pipe).

Further, the characteristic length of the jet pipe is the characteristic length of the wind tunnel outlet, and the electric arc wind tunnel outlet is of a jet pipe-shaped structure.

further, the vertical distance S1 between the electric guide rail and the wind tunnel outlet is greater than 3 × (model characteristic length L1 + nozzle characteristic length L2)/2.

further, the electric guide rail is horizontally away from the wind tunnel outlet by a distance S2> (model characteristic length L1 + nozzle characteristic length L2)/2.

Further, the invention also provides a model thermal assessment method, which comprises the following steps:

(1) When a test is started, before the wind tunnel operation parameters reach dynamic balance, placing the two models at corresponding positions on the dual-mode bracket;

(2) The controller translates the two models to an area outside the wind tunnel outlet;

(3) When the wind tunnel operation parameters are kept in dynamic balance, the controller translates the model A on the dual-mode bracket to the wind tunnel outlet to receive thermal examination; meanwhile, the dual-mode bracket performs heat dissipation and cooling through water cooling;

(4) After the test purpose is achieved, the model A is translated to the outlet of the wind tunnel through the controller, the model B is translated to the outlet of the wind tunnel, the thermal examination is received, and the test is stopped after the test purpose is achieved; the time period of the model A and the model B for carrying out the thermal assessment test is selected as the time period when the dynamic balance parameter fluctuation is lower than the preset threshold value in the operation process of the electric arc wind tunnel.

Compared with the prior art, the invention has the following advantages:

(1) According to the invention, a double-mode is set, the guide strip can ensure that the double-mode bracket is smoothly connected with the wind tunnel outlet, and the double-mode bracket can be ensured to slide along a fixed direction. The invention can switch and examine the two models in one test process, improve the test efficiency and the test precision so as to meet the high-precision test requirement of the current heat-proof material, and is applied to the high-precision measurement requirement in the high-speed aircraft heat-proof material aerodynamic surface simulation test. The test proves that the precision and the test efficiency of a double mode are higher than those of a single mode for the comparative research test of the fine model.

(2) The device can meet the requirement of checking two models in sequence under the condition of continuous operation of the device after all parameters are completely stable, and the relative value of parameter change is far less than +/-1%, so that the device can meet the requirement of fine model checking.

(3) In a primary model test, preparation work of each matching system occupies a large amount of time and can be prepared even in hours, key model assessment time is usually only minutes, the dual-mode support comprises two model mounting holes, assessment of two models can be performed in sequence in the primary test, preparation time of the matching system is saved, energy consumption is saved by 50%, and test efficiency is doubled;

Drawings

FIG. 1 is a first view of the present invention;

Fig. 2 is a second view of the structure of the present invention.

Detailed Description

The invention relates to a double-model ablation feeding mechanism under a flat-plate free jet condition for a pneumatic thermal protection ground simulation test, which is applied to a ground examination test of a thermal protection material of a spacecraft, and can improve the test efficiency and the test precision by switching and examining two models in a one-time test process.

As shown in fig. 1 and 2, the present invention proposes a dual mode feeding structure, comprising: the device comprises a dual-mode bracket 1, an electric guide rail 2, a fixed bracket 3, a guide strip 4 and a controller 5;

Bimodulus support 1 is through being used for direction and spacing gib block 4 and wind-tunnel exit linkage, and bimodulus support 1 bottom is connected with electronic guide rail 2, and horizontal migration under electronic guide rail 2's drive, electronic guide rail 2 installs on fixed bolster 3, and fixed bolster 3 is installed subaerial, and controller 5 controls electronic guide rail 2 work, and then drive bimodulus support 1 horizontal migration.

The electric guide rail 2 is parallel to the guide strip 4.

A pipeline structure is arranged in the double-mode support 1, so that the double-mode support 1 can radiate heat in a water cooling mode.

The electric guide rail 2 under the automatic or manual control of the controller 5 pushes the dual-mode bracket 1 to translate along the guide strip 4 at the wind tunnel outlet.

The guide strip 4 is connected with the double-mold support 1 in a groove mode, and the movement direction of the double-mold support 1 is limited through a groove structure.

Furthermore, the double-mode support 1 is provided with two test model mounting hole positions, and two test models can be mounted at the same time. The characteristic length of the spray pipe is the characteristic length of the wind tunnel outlet, and the electric arc wind tunnel outlet is of a spray pipe-shaped structure.

in order to prevent the influence of the model under examination on the model waiting for examination, two model mounting holes need to be separated by a certain distance, the larger the distance is, the smaller the influence is, but only due to the limitation of examination equipment, the distance between the two models cannot be set too large and needs to be considered comprehensively, preferably, the distance between the two test model mounting holes is D > (1.2 × model characteristic length L1 + the nozzle pipe characteristic length L2), the distance setting formula has the advantages of reducing the influence of the model under examination on the model waiting for examination in the shortest distance, and the influence of the model under the formula on the centers of the two model models under the conventional condition that the model characteristic length L1 and the nozzle pipe characteristic length L2 are not different greatly can be ignored.

the electric guide rail with poor high-temperature resistance capability and price cannot be too close to the outlet of the spray pipe due to the influence of high-temperature airflow, but too far away from the outlet of the spray pipe has too high requirement on the running fit precision of equipment, the debugging time is too long, and the reliability is not high.

The working principle is as follows: when a test is started, the wind tunnel can reach balance only after running for a certain time, before the running parameters of the wind tunnel reach dynamic balance, the two models are placed at corresponding positions on the dual-mode support, and the controller translates the two models to an area outside the outlet of the wind tunnel;

When the wind tunnel operation parameters are kept in dynamic balance, the controller translates the model A on the dual-mode bracket to the wind tunnel outlet to receive thermal examination; meanwhile, the dual-mode bracket performs heat dissipation and cooling through water cooling; after the test purpose is achieved, the model A is translated to the outlet of the wind tunnel through the controller, the model B is translated to the outlet of the wind tunnel, the thermal examination is received, and the test is stopped after the test purpose is achieved; the time period of the model A and the model B for carrying out the thermal assessment test is selected as the time period when the dynamic balance parameter fluctuation is lower than the preset threshold value in the operation process of the electric arc wind tunnel.

Therefore, the time period with extremely low dynamic balance parameter fluctuation in the long-time running process of the electric arc wind tunnel can be fully utilized to carry out thermal examination on the fine model, so that the high-precision measurement requirement within the range of +/-1% can be realized.

According to the feeding structure and the feeding method, through carrying out thermal examination on the two materials in sequence when various parameters reach a balance state in a long-time test, fluctuation caused by various disturbances can be effectively eliminated, and the test precision is greatly improved.

Examples are given below:

the outlet of the wind tunnel nozzle is 180 and 60 in length, the guide strip is 200 in length, 12 in width and 10 in thickness, the brass material is used for processing the groove radius R10, the smoothness Ra1.6 of the inner surface of the groove, the steel double-mold support is 600 in length, 200 in width and 60 in thickness, 2 mounting hole positions containing 152 × 152 models are used for mounting the flat plate model with the thickness of 150 × 150 and less than 60, the distance between the two mounting holes is 375, a water cooling channel is processed in the circumferential direction of the mounting holes and used for protecting the support, the plane distance of the water cooling channel is 10 from the upper surface of the double-mold support, the diameter of the water cooling channel is 10, the matching part of the double-mold support and the guide strip is.

in a primary heat-insulating material-proof assessment test, two identical models of 150 × 150 multiplied by 30 are installed in installation, when the test is carried out, firstly, a model support is moved to a non-assessment area outside high-temperature high-speed airflow by an electric guide rail, a first test model is sent into the high-temperature high-speed airflow at the center of an outlet of a spray pipe for assessment after 200s, the surface temperature is measured, after the assessment is finished, a second core model to be assessed is quickly sent into the high-temperature high-speed airflow at the center of the outlet of the spray pipe for the same assessment, the average value of the stabilized surface temperature of the first model is 1007.4 ℃, the average value of the stabilized surface temperature of the second model is 1000.8 ℃, the relative error is only 0.66 percent, the precision requirement of +/-1 percent of the design is also met, as comparison, the average values of the stabilized surface temperatures measured in two experiments by the two identical models are 1024.1 ℃ and 998.2 ℃ respectively, the relative error is 2.56 percent, although the +/-5 percent assessment requirement is met, for comparison research of a fine model, the precision and the efficiency of a single mode is higher.