The Study of Model Dropping Test Technology in High-Speed Wind Tunnel Driven by Gas and Electromagnetic Force

It is necessary to evaluate the separation safety for the delivery of supersonic embedded weapons in the new generation fighter aircraft. As an unsteady test method based on kinematic dynamics similarity theory, the high-speed wind tunnel model dropping test technology has significant advantages in the study of the separation problems with strong unsteady interference such as the delivery of embedded weapons. Currently, there are problems in the dropping test of embedded models in high-speed wind tunnels, such as unsynchronized mechanism unlocking, inaccurate initial parameters, and uncontrollable open-loop dropping process. In order to solve these problems, a novel air-magnetic coupling ejection mechanism was designed which driven by gas and electromagnetic force. Firstly, the electromagnetic locking structure was designed, and the U-shaped structure was determined to be used for the electromagnetic locking structure through comparing electromagnetic simulation of different electromagnetic structures. The electromagnetic force theory modeling and simulation of the U-shaped electromagnetic locking structure were also carried out, and good consistency was achieved between the two method. Secondly, the electromagnetic compensative structure was designed and optimized with the compensative ability as the optimization objective. Then, a new gas-magnetic coupling ejection mechanism was designed, and the ability of electromagnetic locking structure was test through ground calibration. Finally, the experimental verification was conducted in the high-speed wind tunnel. The results showed that the electromagnetic locking structure could generate enough locking force on the model, which could meet the test requirements. The gas-magnetic coupling ejection technology has achieved good results in the wind tunnel test.