Multi-objective Optimization of Valve Port Structure of Launcher Based on LBM

Abstract

In order to optimize the valve port structure in the launching device,reduce the peak load during the launching process, and improve the reliability and stability of the launching device, the orthogonal experimental design and lattice Boltzmann method were used for simulation research aiming at the valve port components in the launcher. The influences of inlet angle α,outlet angle β,through hole length L and through hole area S on the peak load and exit speed were analyzed,and the response model between each factor and response was obtained. Then,according to the requirements of different exit-speeds and the obtained curve-model,the structural parameters of the valve port with the lowest peak load on the ammunition were selected to ensure the stability of the ammunition launching process. The valve port selected by this method was simulated and verified,and compared with the data before optimization. The results show that the structural parameters of the valve port after optimization are α = β = 45°,L = 27.5 mm,S= 170 mm2;the peak load on the ammunition is reduced to 6 428.4 N,a decrease of 20.15%; the maximum pressure in the low-pressure chamber is reduced to 0.807 7 MPa,a decrease of 21.42%;the exit speed is reduced to 22.4 m/ s,a decrease of only 9.49%. After optimization,the peak load of the ammunition is significantly reduced, and the reduction amplitude of the exit speed is small. The optimization effect is significant,and the scheme is feasible.