Study On A Thrust-vector Control Technique Of The Ejection-rocket With The Spoiler

The ejection-rocket is a main propulsion unit of the rocket ejection-seat, generally mounted beneath the bottom of the seat-bucket. This rocket-motor is used to carry the seat-man mass away from the accident aircraft and let it get clear of the tail-fin for safely saving the occupant's life. Along with the technique of the ejection increased, the escape envelope of ejection-seat has become wider and wider. Ironically, the ejection statistics have consistently shown that the successful recovery rate still is very low in a condition of adverse attitude with low altitude and high speed. The primal problem is that the thrust direction of rocket-motor couldn't be altered corresponding to the attitude of the ejected-seat and therefore the adverse ejection-attitude of ejected-seat couldn't be promptly corrected. Then, the dangers would occur in such kind of adverse ejection-attitudes, as the seat-man mass would quickly make a dash against the ground just because it's too late for the escape parachute to be deployed and for the seat/man separation to be effected.Introducing a helm-gear, this topic adopts a spoiler technique on a thrust-vector control to accomplish a real-time control onto the rocket-motor thrust-vector. The paper has made a detailed analysis about the R&D of ejection-seat and it's rocket-motor at first, and then the performance analysis about the lateral force resulted from the spoiler. On the basis of the above, the prototype configuration of the spoiler and the stretch-length into the flow-field of nozzle-vent have been ascertained according to the overall requirement of ejection-seat. Afterwards, the related testing-design about the tested rocket-motor has been made according to the overall requirement of the rocket-motor and testing- technique has been ascertained. Finally, The ignition tests with and without spoilers under the static conditions and the ignition tests for the spoiler joint-operation driven by the simulated signals under the dynamic conditions have been conducted. The testing results have demonstrated that the spoiler-type thrust-vector controller met the overall requirement and attained the goal of a real-time control onto the thrust direction of rocket-motor, which will improve the escape performance of ejection-seat in the adverse attitude and will make expansion on the escape envelope of ejection-seat.