Investigation on test technique for hypersonic flow-through model nozzle outlet airflow parameters measurement

The accurate measurement of hypersonic flow-through model nozzle outlet airflow parameters is significant for the estimation of the inner flow path aerodynamic characteristics. The presently available test methods are not satisfactory. A new test technique for measuring the outlet parameters is investigated, using a lifting body with air-breathing inlet, but without rudders, elevators and all stabilizers. The interference of two static tubes at different distances and the possible measurement error caused by the angle of airflow and static tube were studied by CFD. And a three degrees of freedom pressure measurement device was developed. The tests at Mach 6 were conducted to measure the nozzle wall pressure, static pressure and pitot pressure of nozzle outlet in Φ1m hypersonic wind tunnel of CARDC. Results indicate that the temperature of the nozzle outlet wall has significant impact on the repeatability of the measurement. When the distance between the nozzle outlet wall and the pressure harrow is less than six times of the static pressure tube diameter, the accuracy of the static pressure measurement would decrease.