A helicopter fuel system positive overload ground simulation device and method
A fuel system and ground simulation technology, applied in the field of simulation test, can solve problems such as the inability to simulate the outlet pressure of the booster pump, and achieve the effect of satisfying development and reducing risks
Active Publication Date: 2021-07-09
CHINA HELICOPTER RES & DEV INST
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The method of simulating by using the method of pumping negative pressure in the fuel tank is mainly to convert the overload in the fuel pipeline from the engine inlet to the liquid level in the fuel tank into flow resistance loss, and draw a corresponding vacuum in the fuel tank, through this The vacuum value simulates the increased gravity loss of the fuel supply pipeline due to overload to verify whether the engine inlet pressure meets the specified requirements. This method simulates the influence of overload in the fuel pipeline and is suitable for positive overload when the engine self-priming fuel supply simulation, unable to simulate the pressure at the outlet of the booster pump when boosting oil supply
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[0039] 1. According to the fuel supply test requirements such as a flight attitude simulated on the ground, overload coefficient n, etc. proposed in the test task book, use the following formula to calculate the flow resistance △P required to be controlled by the overload simulation system:
[0040] ΔP=(n-1)ρ(z 2 -z 1 )g
[0041] ρ is the fuel density;
[0042] z 2 is the height of the engine inlet, z 1 is the height of the fuel level in the fuel tank, z 2 Determined when installing the tested helicopter fuel system, z 1 Determined according to the test requirements;
[0043] g is the acceleration due to gravity;
[0044] Overload coefficient n=1~3.5g;
[0045] 2. Fill the fuel tank with fuel: fill the fuel tank to z1 height;
[0046] 3. Adjust the simulated flight attitude: make the attitude of the simulator be the attitude specified by the test requirements;
[0047] 4. Adjust the fuel flow: fully open the second valve, control the opening of the first valve by col...
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The invention belongs to simulation test technology, and relates to a helicopter fuel system positive overload ground simulation device and method. The present invention measures the pressure difference at both ends of the valve by adding a valve, and compares it with the specified value to control the opening of the valve so that the pressure difference is equal to the potential change value caused by fuel overload in the fuel pipeline. At the same time, the engine flow simulation system must be controlled to make the fuel flow change as required. Therefore, it is possible to simulate both the inlet pressure of the engine and the pressure at the outlet of the booster pump.
Description
technical field [0001] The invention belongs to simulation test technology, and relates to a helicopter fuel system positive overload ground simulation device and method. Background technique [0002] In the ground simulation test of the helicopter fuel system, it is usually required to simulate the positive overload of the helicopter from 1g to 3.5g to verify the fuel supply capability of the fuel system. At present, there are two methods for simulating the positive overload in the ground simulation test of the helicopter fuel system, one is to simulate through the fuel oil level angle, and the other is to simulate by using the negative pressure in the fuel tank. The fuel oil surface angle simulation method mainly uses the characteristic that the fuel liquid level is perpendicular to the overload direction, calculates the oil surface angle of the fuel liquid level relative to the fuel tank through the overload; and then uses the characteristic that the fuel liquid level is ...
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IPC IPC(8): G01M15/00B64F5/60
CPCB64F5/60G01M15/00
Inventor 杨小龙韩杨杨宇王成闵兴明郭芳吴燕燕罗铁苟杨勇志赵辉
Owner CHINA HELICOPTER RES & DEV INST