Small air pillow pressurization system and method for reusable low-temperature power system storage box

Abstract

The invention provides a small air pillow pressurization system and method for a reusable low-temperature power system storage box. The small air pillow pressurization system comprises a ground pressurization system, an on-device pressurization system, a self-generation pressurization system and an acquisition control system. The ground pressurization system is used for completing normal-temperature helium pressurization on a fuel storage tank and a liquid oxygen storage tank before ignition of an engine; the self-generation pressurization system is used for pressurizing the liquid oxygen storage tank together with the on-device pressurization system at the initial stage of starting of the engine and independently pressurizing the liquid oxygen storage tank after the engine is stably started; and the acquisition control system is used for acquiring the air pillow pressure of the fuel storage tank and the liquid oxygen storage tank, outputting control instructions of electromagnetic valves according to pressure control belts of the electromagnetic valves on a fuel tank pressurization air path and an oxygen tank pressurization air path after processing the air pillow pressure, and controlling the on-off of the fuel tank pressurization air path and the oxygen tank pressurization air path.

Description

technical field [0001] The invention belongs to the field of aerospace technology, and in particular relates to a system and method for repeatedly using a small air pillow storage tank of a low-temperature power system, which is especially suitable for a carrier of a small air pillow storage tank using low-temperature liquid oxygen as an oxidant. Background technique [0002] When the main engine of the space vehicle power system is working, the propellant needs to meet a certain inlet pressure to ensure its stable and reliable operation. For low-temperature power vehicles with limited storage tank volume and small air pillows, when the engine is started, the propellant in the storage tank enters the pump chamber of the engine instantly, and negative water hammer occurs in valves and turbo pumps, which causes the static pressure of the propellant to drop rapidly. However, due to the small air pillow of the storage tank and the performance of the self-generating supercharging...

AI Technical Summary

Problems solved by technology

For low-temperature power vehicles with limited storage tank volume and small air pillows, when the engine is started, the propellant in the storage tank enters the pump chamber of the engine instantly, and negative water hammer occurs in valves and turbo pumps, which causes the static pressure of the propellant to drop rapidly. However, due to the small air pillow of the storage tank and the performance of the self-generating supercharging system on the engine is low at the initial stage of engine start-up, it is too late to pressurize the storage tank at this time, and the pressure of the storage tank will drop sharply. Under the combined effect of the decline, it is likely to cause the static pressure of the low-temperature propellant to be too small to vaporize. At this time, the low-temperature propellant will enter the pipeline and pump components in the state of gas phase or gas-liquid two-phase mixed fluid, causing cavitation of the pump. , flying, or prolonging the start time and thrust climb time, resulting in pressure and flow fluctuations, stall operation, oxygen-enriched combustion, etc., causing abnormal operation of the engine, and even causing a complete failure of the start, affecting the launch of the vehicle

[0003] As more and more attention is paid to the development of reusable vehicles, the demand for small air pillow pressurization is also becoming more and more intense. There is no systematic research on the pressurization scheme of the small air pillow in the power storage tank

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