Cold air driving forced starting system and method for liquid rocket engine

Abstract

A cold air driving forced starting system of a liquid rocket engine comprises a high-pressure gas cylinder, an electric explosion valve and a starting turbine. The high-pressure gas cylinder is used for providing high-pressure helium, and an outlet of the high-pressure gas cylinder is connected with an inlet of the electric explosion valve; an outlet of the electric explosion valve is connected with an inlet of the starting turbine and used for controlling opening of high-pressure starting gas. A cold air inlet end of the starting turbine is connected with the electric explosion valve, and an exhaust outlet directly leads to the outside; and a starting turbine shaft of the starting turbine is coaxial with the engine turbine pump and is used for converting the cold air power into turbine power and transmitting the turbine power to the rocket engine turbine pump to provide power for starting the rocket engine. The system is used for starting the rocket engine, the system is simple, the structure is reliable, operation is easy, the maintenance cost is low, secondary use can be continued only by replacing the gas cylinder, and the starting requirement of the liquid rocket engine is met; according to the invention, the starting turbine power and working time can be accurately controlled by selecting the volume, pressure and exhaust flow of the gas cylinder.

Description

technical field [0001] The invention belongs to the technical field of liquid rocket engines, and in particular relates to a forced start system and method for liquid rocket engines driven by cold air. Background technique [0002] For the pump-type liquid rocket engine, the turbo pump needs to run before the rotation reaches the full operating pressure, which makes the rocket engine need a special starting system and method. At present, the common starting methods of the liquid rocket engine include: gunpowder starter start, starter box Starting and self-starting etc. The gunpowder starter needs to develop a special solid gunpowder starter, which has a long development period and high cost; the starter box needs to add two extrusion supply systems, which greatly increases the complexity of the engine system and reduces the reliability of the engine to a certain extent; Self-starting has high requirements on the engine's starting conditions, transition time and transition r...

AI Technical Summary

Problems solved by technology

The gunpowder starter needs to develop a special solid gunpowder starter, which has a long development period and high cost; the starter box needs to add two extrusion supply systems, which greatly increases the complexity of the engine system and reduces the reliability of the engine to a certain extent; Self-starting has high requirements on the engine's starting conditions, transition time and transition rate, and requires a lot of hot test runs, making it difficult to develop

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