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Study of choked flows through a Convergent Nozzle

Journal of Thermal Science 2010年第3期19卷 193-197页

作者： Kazunori KUBO Yoshiaki MIYAZATO Kazuyasu MATSUO Department of Mechanical Systems Engineering Faculty of Environmental EngineeringThe University of Kitakyushu1-1 HibikinoWakamatsu-kuKitakyushu City808-0135Japan

When sonic nozzles of significantly smaller diameter are used as standard flow meters,the critical back pressure ratio is affected by the boundary layer at the nozzle ***,the effect of the boundary layer on choking criteria is still ***,the choking phenomenon of a convergent nozzle flow has been experimentally investigated using four convergent nozzles with the same diameter followed by a straight pipe of a variable *** a result,it is shown that the critical back pressure ratio is smaller than that for the steady one-dimensional is-entropic flow and decreases as the boundary layer thickness ***,the main flow Mach number at the nozzle exit is supersonic when the back pressure ratio is equivalent to the choking condition,and the Mach number increases as the boundary layer thickness increases.

关键词： Boundary Layer Convergent Nozzle choked flow Choking Pressure Ratio

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Delivery of inert gas through a vertical borehole using inert gas generator: A theoretical study

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International Journal of Mining Science and Technology 2020年第4期30卷 501-510页

作者： Rickard Hansen Sustainable Minerals Institute The University of QueenslandBrisbaneQueensland 4072Australia

The delivery of the inert gas through a vertical borehole using inert gas generator or IGG is *** limitations and/or transient effects are *** the analysis,the borehole diameter,borehole length,type of borehole and partial condensation prior to entering the borehole were varied.A choked flow will occur for a contraction exit or borehole of 0.3 m in diameter if no condensation prior to the contraction *** partial condensation takes place,a borehole diameter of 0.3 m will be possible if almost 50%of the water vapour ***,pressure losses along boreholes with a diameter of 0.3 or 0.4 m are significant and could pose a challenge if trying to mitigate the pressure *** a booster fan prior to the inlet of the 0.4 m lined borehole would still be a *** corresponding case with a 0.5 m borehole presents much more favourable pressure *** 0.5 m diameter lined borehole should be regarded as the lower *** rapid heating of the unlined borehole surface will increase the risk of thermal spallation and possibly imposing *** the mechanisms during gas delivery will increase the likelihood of a successful inertisation.

关键词： GAG Inert gas Condensation Pressure loss choked flow Gas velocity Borehole Heat transfer

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