Optimization and verification of wind tunnel free-flight similarity law for separation of cluster munition  

作　　者：Fei XUE Jun TANG Huaqiang WANG Zenghui JIANG Yuchao WANG Han QIN Peng BAI 

机构地区：[1]China Academy of Aerospace Aerodynamics,Beijing 100074,China [2]Hubei Aerospace Flight Vehicle Institute,Wuhan 430048,China [3]Beijing Institute of Control Engineering,Beijing 100036,China

出　　处：《Chinese Journal of Aeronautics》2021年第3期61-70,共10页中国航空学报（英文版）

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

摘　　要：In view of the separation form of the separator from the back of the carrier upward and from the side of the carrier outward, separation-safety research is carried out by taking the separation of a cluster munition as an example. In previous wind tunnel free-flight tests, the similarity law of vertical, downward, moving submunition was used to design submunitions at different positions in different initial-velocity directions, which resulted in large discrepancies between wind tunnel test results and real flight. In a wind tunnel test, each submunition has an independent time-reduction ratio with respect to the dispenser. Even if the separation trajectory of a single submunition is accurate, there will be errors in the position of each submunition at a given time. Therefore, it is necessary to determine the time-reduction ratio between submunitions, and to modify the test results later. In order to ensure the accuracy of wind tunnel test results, the similarity law of a freeflight test in a wind tunnel is derived in this paper. The time-correction scheme to ensure motion similarity between submunitions is solved. Numerical simulation is used to simulate the separation of a wind tunnel test and real aircraft, and the motion parameters of different submunitions are solved. The results show that the new similarity laws derived for different types of submunitions can greatly reduce the errors caused by previous similarity laws. In addition to the case for the separation of a cluster munition, the similarity law can also be applied to the free-flight test design of wind tunnels for vertical separation and horizontal separation of other kinds of aircraft.

关 键 词：Cluster munition Ejection separation Free-flight wind tunnel test Multi-body separation Similarity-law derivation 

分 类 号：TJ414[兵器科学与技术—火炮、自动武器与弹药工程]