Process and Characteristics of Pressure Building in Cavity under High-speed Flow
The evolution of internal pressure within a cavity with pores under the action of high-speed inflow has significant im-plications for the separation of missile nose cones,the shedding of fairings,and the opening of hatch doors. Around the cavity structure featuring inlet pores and outlet pores,theoretical and numerical models have been established to predict changes in cavity pressure. These models,combined with experimental validation,have been used to investigate the effects of pore loca-tion,inlet and outlet area,and cavity volume on the pressurization process within the cavity. The results indicate that the posi-tion and size of the exhaust pores have a significant impact on the pressurization effectiveness of the cavity. With an air intake to outlet area ratio of 0. 75,pores in the windward area of the cavity can enhance the pressurization rate during the initial phase. However,in the steady state,as the pores transition from intake to exhaust,the pressure within the cavity decreases by approximately 39％ compared to the condition without outlet pores. The pressure changes in the cavity are more complex in are-as where the surface slope transitions influenced by the evolution of flow patterns,leading to a reduction to 50％ of the pressure in the absence of exhaust in the steady state. When the pores are located at the rear of the cavity,the pressure during the steady state is the lowest,approximately 44％ of that in the non-exhaust condition. Meanwhile,an increase in the inlet area signifi-cantly raises the cavity pressure,while an increase in the area of the exhaust pores lowers the cavity pressure and reduces the time required for pressurization. The volume of the cavity has a certain effect on the rate of pressurization but has a minimal im-pact on the final pressurization outcome.
high speed aircraftpressure changepore flow ratenumerical simulation
万方数据
维普
