Patent ID: 6101957
Filing Date: 2000-08-15
Classification: F02K,F23G,F42B,Y10S

Abstract:
An apparatus for the burning of a solid rocket motor having a rocket nozzle which generates exhaust gases containing flammable and explosive products, comprising:a cylindrical shaped mixing chamber having a circumferential wall and a first opening at one end of said mixing chamber, the first opening of said mixing chamber being adapted to receive said solid rocket motor allowing a portion of said solid rocket motor and said rocket nozzle to be located within said mixing chamber;said solid rocket motor being secured to said mixing chamber by means of a clamp positioned at the first opening of said mixing chamber, said clamp including a seal abutting said solid rocket motor to form a gas tight seal for preventing an escape of said exhaust gases through the first opening of said mixing chamber;said mixing chamber having a second opening at the other end of said mixing chamber and a plurality of air injection ports located in the circumferential wall of said mixing chamber near said rocket nozzle; anda multistep expansion nozzle positioned in the second opening of said mixing chamber and attached to said mixing chamber, said multistep expansion nozzle having an inner wall with a stair-step shaped inner surface, said stair-step shaped inner surface comprising a plurality of steps having an aspect ratio in a range of between five and seven.