Design And Experimental Study Of Cone Valve Gas Flow Regulation System

Because of its simple structure,high reliability and high specific impulse,Solid rocket ramjet engine become the choice of future missile weapon propulsion system.Gas generator with variable gas flow technology is the key point of Solid rocket ramjet engine,So that the solid rocket ramjet engine can achieve large airspace,wide range Mach number and high angle of attack flight.Adjustable gas flow gas generator has become a popular research direction.This paper will focus on the following aspects:Gas flow control principle and Adjustment characteristics analysis,control system design,gas generator cone valve design and dynamic seal design,gas generator pressure control algorithm design,gas generator ignition experiment research.(1)The principle of gas generator flow regulation is analyzed,and it is pointed out that there are time-varying phenomena in the process of gas generator.The main factor of time-varying phenomenon is that the free volume is increasing and the time-varying phenomenon has great influence on the controller.The time-varying phenomenon of volume increases the response time and overshoot of the system.At the same time,the influence of the throat area change rate on the gas negative modulation is analyzed.(2)The gas flow control system is designed.The cone valve half-angle and nozzle throat diameter are not determined before the valve stroke,the throat minimum clearance,motor control accuracy and machining accuracy and other factors being considered,which can make the cone valve integrated effect is optimal.Three-layer rubber O-ring plus high-temperature grease combination seal can better seal high temperature and high pressure gas flow of the gas generator,and the stepper motor can work normally under the friction produced by the O-ring,The control strategy based on MCU and the control strategy based on MCU and Labview are established.(3)The control algorithm of gas generator is studied.The traditional PID controller is not suitable as the controller of the gas generator because of the free volume time-variant of the gas generator.Fuzzy proportional integral controller is an on-line tuning technique,which makes proportional and integral coefficients of the traditional proportional integral controller can be self-tuning,which makes the traditional proportional integral controller have real-time auto-tuning function,so that Fuzzy proportional integral controller can control the real-time gas generator system.(4)The ablation of gas generator cone valve was studied.The ablation problem problem of the valve body exists due to the eccentric problem and the material problem of the valve body.The eccentric problem of the cone valve and the nozzle is difficult to solve because of threaded connection of the gas generator,so the better solution to solve the ablation problem is to solve the material problem of the valve body.The anti-ablation performance of taper valve made of tungsten infiltrated copper was verified by experiments,and the effectiveness of the fuzzy PI controller in controlling the pressure is verified by the ignition experiment.