Investigation of Choking in a Convergent Nozzle Flow : 1st Report, An Experiment on Choking Pressure Ratio and Choked Flow Rate(Fluids Engineering)

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  • MIYAZATO Yoshiaki
    Department of Mechanical Systems Engineering, Faculty of Environmental Engineering, The University of Kitakyushu
  • KUBO Kazunori
    Department of Mechanical Systems Engineering, Faculty of Environmental Engineering, The University of Kitakyushu
  • KONDO Yosuke
    日機装(株)
  • MATSUO Kazuyasu
    Department of Mechanical Systems Engineering, Faculty of Environmental Engineering, The University of Kitakyushu

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Other Title
  • 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)
  • 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
  • サキボソ ノズル ナガレ ノ チョーク ニ カンスル ケンキュウ ダイ1ポウ チョーク アツリョクヒ ト チョーク リュウリョウ ニ カンスル ジッケン

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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.

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