Abstract
The starting process of the flow in the nozzle of the JF-14 shock tunnel (1.6 m in length, 500 mm in outlet diameter) in the State Key Laboratory of High Temperature Gas Dynamics is analyzed by calculation and experiment. Two key factors which directly affect the duration of the nozzle starting are the velocity of the expansion wave and the low-velocity zone generated by the interaction between the secondary shock wave and boundary layer on the wall surface. In the process of the nozzle starting, the flow field stabilizes at the center of the nozzle outlet first, and then gradually stabilizes along the radius direction, thus defining the central startup and complete startup of the nozzle. It is found that there is a critical initial pressure. When the initial pressure is lower than the critical pressure, the airflow can reach stability in the nozzle outlet center with the shortest time, otherwise, the time required is much longer. The time required for the airflow to stabilize in the whole outlet section is mainly affected by the size of the low-velocity zone. It is also found that only at a very low initial pressure can the airflow simultaneously reach stability at the entire outlet of the nozzle.
Highlights
With an increase in the flight Mach number of an aircraft, the temperature of the gas near the stagnation point rises sharply
The experimental study of this problem depends on flight tests and shock tunnel tests
In order to accurately understand the starting characteristics of the nozzle, an experimental study on the nozzle starting process was conducted by using the JF-14 shock tunnel, and the nozzle starting process was numerically calculated using the thermochemical non-equilibrium reaction model
Summary
With an increase in the flight Mach number of an aircraft, the temperature of the gas near the stagnation point rises sharply. In the case of the high-enthalpy shock tunnel, whose effective test duration is quite short, the research on the startup duration of the nozzle is attracting increasing attention, especially the effects of the initial pressure and the reservoir region conditions on the starting process. In order to accurately understand the starting characteristics of the nozzle, an experimental study on the nozzle starting process was conducted by using the JF-14 shock tunnel (the State Key Laboratory of High Temperature Gas Dynamics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, China), and the nozzle starting process was numerically calculated using the thermochemical non-equilibrium reaction model.
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