Performance Analysis And Optimization Of Pintle Type Solid Divert And Attitude Control System

As the actuator of air defense and anti missile Kinetic Kill Vehicle(KKV),Solid Divert and Attitude Control System(SDACS)has simple structure,safe and reliabile.It is widely used in air-based,sea-based and other KKV with high safety requirements.Pintle type SDACS realizes thrust regulation by pintle movement,and multi valve coordination is coupled with thrust output.In this paper,the performance calculation model of Pintle type SDACS is established,the flow field simulation and profile optimization of pintle valve are carried out,and the valve opening distribution method is studied,which provides technical support for the optimal design and Application Research of Pintle type SDACS.In this paper,the performance calculation model of Pintle type SDACS is established,and the performance calculation and analysis of SDACS is carried out.The calculation method of the equivalent throat area of pintle valve based on the dichotomy search method and the calculation method of the effective stroke of pintle based on the nested dichotomy method are proposed.The calculation of the equivalent throat area of pintle valve and the effective stroke of pintle are carried out.The polynomial fitting of the equivalent throat area of pintle valve with the stroke of the pintle is realized based on the least square method,which provides a model basis for the design and optimization of pintle profile of the gas valve of SDACS.A recursive matching design method of the pintle profile is proposed.This method can quickly give the pintle head profile that meets the requirements of the linearity of the equivalent throat area of the gas valve with the pintle stroke on the premise that the nozzle profile is known.The optimization method of nozzle profile of pintle valve based on two-dimensional flow field simulation of gas valve is proposed.The nozzle expansion section profile optimization is carried out for the fixed opening and variable opening of gas valve respectively,which realizes the optimal efficiency of pintle valve nozzle,and provides a technical basis for the optimal design of SDACS.The calculation method of thrust correction factor based on the least square method and two-dimensional flow field simulation of gas valve is proposed,and the thrust correction formula meeting the requirements of real-time solution accuracy and efficiency of terminal interception of KKV is obtained,which provides a technical basis for the application research of SDACS.The three-dimensional flow field simulation of pintle valve is carried out,the accurate prediction of thrust performance of gas valve is realized,and the flow field structure of gas valve is obtained,which provides a technical basis for revealing the ablation law of gas valve profile;Comparing the two-dimensional flow field simulation results of gas valve,the effects of inlet angle and flow field simulation dimension on the flow field structure and thrust performance of gas valve are analyzed,and the feasibility of nozzle profile optimization based on two-dimensional flow field simulation of gas valve is verified.The space motion model of KKV is established,including space motion equations,relative motion equations of missile and target,guidance equations,side window constraint equations,etc.the calculation method of valve opening distribution of SDACS meeting the constraint of total opening of gas valve is proposed.The end interception simulation platform of KKV is built,and the end interception simulation is carried out to verify the effectiveness of the calculation method of valve opening distribution.The research results of this paper play a fundamental role in the configuration analysis and design optimization of Pintle type SDACS,and can be widely applied to the performance analysis and design optimization of variable thrust solid motor.It provides a technical basis for the application of SDACS in the terminal interception process of KKV.