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Control method of pure gas jet wind tunnel

A pure gas and control method technology, applied in the field of wind tunnel test, can solve problems such as damage, equipment ablation, heat storage body floating, etc., and achieve the effects of improving test efficiency, saving energy and avoiding damage

Active Publication Date: 2021-01-08
INST OF MECHANICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. The original jet wind tunnel control method mostly adopts the multi-channel parallel control idea, which is difficult to cope with the recursive heat storage wind tunnel operation process;
[0006] 2. When the high-flow high-pressure air flow enters the heat storage tank, there is a danger of floating the heat storage body, which will cause irreversible damage to the heat storage body; It will cause severe ablation or damage to related equipment;

Method used

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  • Control method of pure gas jet wind tunnel
  • Control method of pure gas jet wind tunnel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Such as figure 1 As shown, an automatic control method of a pure gas jet wind tunnel is used in a regenerative pure gas jet wind tunnel. From the completion of the heat storage test to the end of the high temperature valve closing test, the time intervals are t0, t1, t2, t3, t4 , t5, t6, t7, t8 represent each time node, and the method includes the following steps:

[0039] (1) Test ready stage t0: The temperature gradient distribution of the heat storage tank reaches the expectation, that is, the heat storage is completed, and the wind tunnel test is ready;

[0040] (2) Low-flow inflation stage t1~t2: Press pure gas into the heat storage tank at a constant flow rate from the small-flow inflation path. At this time, all valves connected to the heat storage tank, including the high-temperature opening and closing device and other valves, are closed. state, when the pressure value of the heat storage tank is higher than the preset threshold α, the small flow charging stag...

Embodiment 2

[0058] On the basis of Example 1, different from Example 1, such as figure 1 As shown, an automatic control method of a pure gas jet wind tunnel is used for a regenerative pure gas free jet wind tunnel. According to the results of multiple debugging, the method includes the following steps:

[0059] (1) In the test preparation stage, the temperature gradient distribution of the heat storage tank reaches 1700K at the upper end of the heat storage tank and 800K at the lower end, forming a gradient distribution, and the wind tunnel test is ready.

[0060] (2) In the small flow gas charging stage, in order to ensure that the heat storage bricks in the heat storage tank do not float, a differential pressure sensor P is installed to measure the pressure difference between the upper and lower sides of the heat storage tank aIt can not exceed 20KPa. According to the flow calculation, the small flow gas charging path adopts a 4mm sonic flowmeter, and the upstream pressure is set to 8MP...

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Abstract

The invention belongs to the technical field of wind tunnel tests, and provides a control method of a pure gas jet flow wind tunnel and aims to carry out related tests of an aircraft or an engine in alaboratory environment. The method comprises the steps of a test preparation stage, a small-flow inflation stage, an injection starting stage, a wind tunnel test stage, a deflation stage and the like. Firstly, small-flow heat storage tank pressurization is carried out in a heat storage tank, after the pressure reaches a preset value, an injection system is started, then total pressure stabilization control is achieved through a large-flow inflation path, then a wind tunnel test is carried out, and residual gas in the tank is discharged after the test is finished. Pressurization of the heat storage tank, starting of the injection system and total pressure stabilization control are achieved, and then safe and automatic operation control over the pure gas wind tunnel is achieved. The controlmethod is suitable for pure gas free jet test equipment based on a heat storage heating mode.

Description

technical field [0001] The invention belongs to the technical field of wind tunnel test, and in particular relates to a control method of a pure gas wind tunnel, in particular to an automatic control method of a regenerative pure gas free jet wind tunnel, which is suitable for generating high-temperature, high-pressure, high-speed pure gas on the ground ground test equipment. Background technique [0002] In order to carry out air-breathing hypersonic propulsion tests in a laboratory environment, it is necessary to build wind tunnel equipment that can simulate the total temperature, total pressure, Mach number and gas composition under real flight conditions, so that the airflow close to the actual flight conditions tests in. At present, the most commonly used continuous energy addition methods mainly include arc heating, combustion heating, resistance heating, and regenerative heating. Arc heating generates high-temperature airflow through the energy addition of high-volt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M9/04
CPCG01M9/04
Inventor 高占彪顾洪斌黄河激孟东东岳连捷
Owner INST OF MECHANICS - CHINESE ACAD OF SCI
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