SEMIFREE-JET TESTING APPARATUS

摘要

PROBLEM TO BE SOLVED: To lower the back pressure of a supersonic nozzle and to enhance a starting property without making the capacity and the size of a pump or an exhauster large. SOLUTION: In this semifree-jet testing apparatus, a supersonic diffuser 6 is connected to the exit part 2b of a supersonic nozzle 2 which takes into a supersonic airflow, The extrance part 10a of a subsonic diffuser 10 is made to communicate with the exit part of the supersonic diffuser 6. A turbo-engine 11 is connected to the exit part 10b of the subsonic diffuser 10. A cowl external bypass part 14 is formed on the side of a cowl 7a which becomes the surface of the supersonic diffuser 6. A cowl external bypass part 15 which changes the opening area of the cowl external bypass part 14 is equipped at the part.