Optimization and verification of free flight separation similarity law in high-speed wind tunnel

作     者：Fei XUE Xin JIN Peihua FENG Han QIN Zenghui JIANG Yuchao WANG Peng BAI Fei XUE;Xin JIN;Peihua FENG;Han QIN;Zenghui JIANG;Yuchao WANG;Peng BAI

作者机构：China Academy of Aerospace AerodynamicsBeijing 100074China AVIC Chengdu Aircraft Design&Research InstituteChengdu 610091China Beijing Machinery and Electronics Engineering InstituteBeijing 100074China 

出 版 物：《Chinese Journal of Aeronautics》 (中国航空学报（英文版）)

年 卷 期：2020年第33卷第2期

页      面：501-507页

核心收录：

学科分类：08[工学] 080103[工学-流体力学] 0802[工学-机械工程] 0825[工学-航空宇航科学与技术] 0801[工学-力学（可授工学、理学学位）] 

基　　金：supported by the Advanced Research Fund for Weapons and Equipment Development of China. 

主　　题：Carrier and missile interference Ejection separation Gravity separation High-speed weapon delivery Multi-body separation Similarity law optimization 

摘      要：Based on the similarity of separation time,a similarity law optimization method for high-speed weapon delivery test is derived.The typical separation state under wind load is simulated by the numerical method.The real separation data of aircraft,separation data of previous test methods,separation data of ideal wind tunnel test of previous methods,and simulation data of the proposed optimization method are obtained.A comparison of the data shows that the method proposed can improve the performance of tracking.Similarity law optimization starts with the development of motion equations and dynamic equations in the windless state to address the problems of mismatching between vertical and horizontal displacement,and to address the problems of separation trajectory distortion caused by insufficient gravity acceleration of the scaling model of existing light model.The ejection velocity of the model is taken as a factor/vector,and is adjusted reasonably to compensate the linear displacement insufficiency caused by the insufficient vertical acceleration of the light model method,so as to ensure the matching of the vertical and horizontal displacement of the projectile,and to improve the consistency between the test results of high-speed projection and the actual separation trajectory.The optimized similarity law is applicable to many existing free-throwing modes of high-speed wind tunnels.The optimized similarity law is not affected by the ejection velocity and hanging mode of the projectile.The optimized similarity law is suitable not only for the launching of the buried ammunition compartment and external stores,but also for the test design of projectile launching and gravity separation.