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A Control Method of Pure Gas Jet Wind Tunnel
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A pure gas and control method technology, applied in the field of wind tunnel testing, can solve problems such as damage, equipment ablation, and long inflation time, and achieve the effects of avoiding damage, improving test efficiency, and saving energy
Active Publication Date: 2021-06-18
INST OF MECHANICS CHINESE ACAD OF SCI
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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;
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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. In order to carry out aircraft or engine-related tests in a laboratory environment, the invention provides a control method for a pure gas jet wind tunnel. The method includes: a test preparation stage and a small flow inflation stage , ejection start-up phase, wind tunnel test phase, deflation phase and other steps. First, pressurize the heat storage tank with a small flow rate. After the pressure reaches the preset value, start the injection system and realize the total pressure stabilization control through the large flow gas charging circuit, and then carry out the wind tunnel test. After the test, the discharge Drain the remaining air in the tank. The invention realizes the pressurization of the heat storage tank, the start-up of the injection system, the control of the total pressure stabilization, and further realizes the safe and automatic operation control of the pure gas wind tunnel. It is suitable for pure gas free jet test equipment based on regenerative heating method.
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...
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