Aerodynamic characteristics of store during lateral jet assisted separation from cavity using free drop technique

Abstract

Aimed at the problem of store separation from internal cavity, this paper innovatively puts forward a separation scheme of using lateral jet to assist store safe separation. The jet ensures that the store is continuously subjected to down head moment during separation, so as to ensure safe separation. The wind tunnel free drop test technique with lateral jet is established, which can ensure that there is no support interference in the motion process of the store and more truly simulate the motion of the store. The feasibility of the new separation scheme is proved by wind tunnel test. The test shows that the new scheme can also change the more dangerous state into a safe state. Through the analysis of the test data, the pitching moment coefficients of the store under different pressures in the high-pressure cylinder are obtained, and the effects of aircraft and cavity on the pitching moment of the store are obtained. The 3 stages of store passing through cavity shock wave are found. The results show that the lateral jet provides the store with continuous head down moment, and makes the store overcome the head up moment caused by the shock wave in front of the cavity, so as to ensure the safety of separation.