POGO active suppression method and system based on overflow valve

Abstract

The invention relates to a POGO active suppression method and system based on an overflow valve. The system comprises a pressure sensor, a controller and the overflow valve. The pressure sensor is installed on a high-pressure pipeline behind an engine pump and used for sensing the pressure pulsation condition of fluid in the high-pressure pipeline behind the pump, and a sensed pressure signal is sent to the controller. The controller generates an excitation signal according to the pressure signal and is used for controlling the opening degree of the overflow valve; and the overflow valve is used for adjusting the opening degree and the overflow amount according to the excitation signal sent by the controller, and then the pressure pulsation of the high-pressure pipeline behind the engine pump is reduced.

Description

technical field [0001] The invention belongs to the field of overall design of liquid carrier rockets, and mainly relates to POGO and pressure pulsation suppression of liquid carrier rockets. Background technique [0002] During the flight of the liquid launch vehicle, the interaction between the structural system and the propulsion system may cause the liquid rocket to generate unstable longitudinal vibration. Because its vibration form is similar to "walking on stilts", it is named POGO vibration. POGO is one of the major issues affecting the flight reliability and even the success of the launch vehicle. Therefore, suppressing or even eliminating POGO vibration has become a key technology in the design process of liquid launch vehicles and one of the important prerequisites for manned spaceflight. [0003] At present, in engineering, the vibration of POGO is mainly suppressed by installing a pressure accumulator in front of the pump. The air cavity in the pressure accumula...

AI Technical Summary

Problems solved by technology

The bellows accumulator has obvious suppression effect on the structural first-order POGO instability, but it is difficult to suppress the high-order POGO vibration

[0005]2. For the cryogenic propulsion system of a large launch vehicle, the volume of the pressure accumulator must be made large to meet the requirements of POGO suppression, and it is difficult to adapt to the increasingly compact pipeline layout system

[0006]3. The diaphragm of the metal diaphragm box commonly used in my country’s launch vehicles is very thin, and the diaphragms are welded and formed. The weld seam of the large metal model is very long. Prone to fatigue damage, low reliability

[0007]4. The gas injection pressure accumulator commonly used in foreign launch vehicles, because there is no isolation device between the gas cavity and the liquid, there is a risk of gas influx into the delivery pipe during the rocket flight , may affect the normal operation of the engine

Images