先細ノズル流れのチョークに関する研究 : 第1報,チョーク圧力比とチョーク流量に関する実験(流体工学,流体機械)  [in Japanese] Investigation of Choking in a Convergent Nozzle Flow : 1st Report, An Experiment on Choking Pressure Ratio and Choked Flow Rate(Fluids Engineering)  [in Japanese]

The choking phenomenon of a convergent nozzle flow has been experimentally investigated using four nozzles with the same diameter but different boundary layer thickness at the exit of the nozzle. It is observed that the pressure ratio across the nozzle when the flow is just choked depends on the boundary layer thickness at the nozzle exit, and both the choking pressure ratio and the choked mass flow rate decrease with increasing boundary layer thickness. The main flow at the exit of the nozzle when the flow is choked is supersonic, and the Mach number increases with increasing boundary layer thickness.