Ground performance testing method of cabin safety valve

Abstract

The invention belongs to the technology of aircraft cabin pressure control system test, and specifically relates to a ground performance testing method of a cabin safety valve. The method is characterized in that air supplying volume flow rate of a cabin is calculated under a high-altitude test condition, and then corresponding mass flow rate is calculated under a ground condition based on the high-altitude volume flow rate and is treated as the air supplying volume of a ground test cabin; and air with special mass flow rate is supplied to the cabin through a flow rate control device, so thatthe volume flow rate of air flowing through the safety valve in the ground test is consistent with that in high-altitude test, and the opening degree of the safety valve is consistent with that in thehigh-altitude test, and as a result, the performance of the safety valve is accurately measured under the ground condition; the testing efficiency is effectively improved; the testing cost is decreased; and the method is high in actual application value.

Description

Technical field [0001] The invention belongs to the test technology of an aircraft cockpit pressure control system, and in particular relates to a ground performance test method of a cockpit safety valve. Background technique [0002] At present, the pneumatic safety valve is installed between the atmospheric environment chamber and the cockpit to ensure that the residual pressure of the aircraft cockpit does not exceed the structural safety pressure. Therefore, it is necessary to conduct high-altitude performance tests on installed aerodynamic safety activities. [0003] At present, there are two performance test methods for pneumatic safety valves: [0004] The first is to simulate the high-altitude flight environment. The safety valve is installed between the atmospheric environment cabin and the cockpit. The atmospheric environment cabin is pumped to the cruising altitude of the aircraft through the vacuum system. The air supply flow of the cockpit is simulated accordin...

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Problems solved by technology

[0004] The first is to simulate the high-altitude flight environment. The safety valve is installed between the atmospheric environment cabin and the cockpit. The atmospheric environment cabin is pumped to the cruising altitude of the aircraft through the vacuum system. The air supply flow of the cockpit is simulated according to the air supply volume of the actual environmental control system of the aircraft, and the simulated cockpit is measured. The pressure difference with the atmospheric environment is the cabin residual pressure value, and the cabin residual pressure value is the working pressure of the safety valve, but this method needs to simulate the high-altitude flight environment, and the test cost is high

[0005] The second is that the safety valve performance test is pressurized on the ground; since the air supply flow rate of the cockpit is given in the form of mass flow rate, the current various test methods for the air supply to the cockpit are measured according to the mass flow rate, and the gas supply to the cockpit is measured by the mass flow rate in the atmospheric environment chamber. When the air reaches the cruising altitude of the aircraft, the air density in the cockpit is consistent with the actual situation of the aircraft. However, when the atmospheric chamber is connected to the atmospheric environment for ground tests, the air supply in the cockpit is still measured by mass flow rate because the air density in the cockpit is higher than that of the cockpit at high altitude. It will cause the actual volume flow through the safety valve to decrease, and the opening of the valve will decrease under the same pressure difference, which cannot accurately verify the exhaust performance of the safety valve. The reliability of the test results is low

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