Numerical Simulation and Experimental Study on Aerodynamic Characteristics of the Ejection Life-saving Rocket Sled

Abstract

The full-scale rocket sled test is a low-risk and cost-effective research method to address the challenges of aircraft ejection life-saving tests under high-speed operating conditions. In order to determine the influence of aerodynamic forces on the working state of the ejection rescue rocket sled, a full-scale dual track ejection rescue rocket sled model was established in this paper. Meanwhile,based on the CFX solver, the impact of three turbulence models (k - ε, k - ω, SST) on the numerical simulation results was compared and analyzed. It shows that the relative errors of drag force and lift force are less than 1. 5%. Then the aerodynamic characteristics of the sled body and cockpit of the ejection rescue rocket sled were numerical simulated based on SST turbulence model. The numerical simulation results indicate that the equivalent resistance coefficient of the ejection rescue rocket sled monotonically increases with the increase of velocity, and the ratio of sled body to cabin resistance shows a pattern of first decreasing and then increasing under subsonic and transonic conditions. The impact of rocket sled body on the drag force, lift force and pressure distribution of the ejection rescue cockpit cover is relatively small,with a relative absolute error of less than 16%. Therefore,the flow field of the rocket sled shows insignificant effect on the cutting performance test of the aircraft cockpit cover. Rocket sled tests were conducted for ejection rescue under subsonic conditions. The experimental data are in good agreement with the numerical simulation results, which verifies the reliability of the numerical simulation method. The research conclusion can provide ideas for aircraft ejection life-saving experiments.