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Experimental study of unsteady supersonic flow interacting with porous cavity and jets or rods

Journal of Thermal Science 2014年第2期23卷 153-159页

作者： nao kuniyoshi Minoru Yaga Isao Teruya Masaaki Ishikawa Graduate schools of engineering and science University of the Ryukyus1 SenbaruNishiharaOkinawa903-0213Japan Department of Mechanical System Engineering University of the Ryukyus1 SenbaruNishiharaOkinawa903-0213Japan

In this study,an experiment was performed to clarify the flow field,in which the jets were normally injected into a main supersonic flow surrounded by a porous cavity,and this report figures out interaction between starting shock wave and porous *** the experiment,a porous cavity is attached to a main duct and jets and rods are inserted to the main duct on the porous *** reveal this flow field,the thermal tuft probe was adopted to experimentally investigate the flow in the *** the experiments,the effect of the porous cavity with jets or rods on the flow field is studied by means of visualization of schlieren method with a high speed camera and measurement of cavity flow with thermal tuft *** a results,frequency analysis of output of the thermal tuft probe revealed that some clear dominant frequencies were confirmed when the starting shock wave existed around the porous cavity in all cases of jets and rods ***,visualization of schlieren method with a high speed camera clarified that a starting shock wave had the same dominant frequencies as that of the flow fluctuation in the cavity only around the cavity.

关键词： Shock wave Compressible flow Porous cavity Unsteady flow direction

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Numerical Simulation of Interaction between Supersonic Flow and Backward Inclined Jets Surrounded by Porous Cavity

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Open Journal of Fluid Dynamics 2017年第3期7卷 276-287页

作者： nao kuniyoshi Minoru Yaga Department of Marine Electronics and Mechanical Engineering Tokyo University of Marine Science and Technology Koto-ku Japan Department of Mechanical Systems Engineering University of the Ryukyus Nishihara Japan

As one of supersonic mixing techniques, a supersonic mixing technique using a cavity and a porous wall has been proposed. The cavity and the porous wall generate the low speed region in the cavity, which enhances mixing the main flow with the jets. In this study, numerical simulations were conducted to clarify the effects of backward inclined jets on the mixing technique using a porous wall and a cavity. In the numerical simulations, three patterns of jet injections which combined normal jets with backward inclined jets were studied. As a result, the combination of a backward inclined jet and a normal jet generates the suction flow behind the backward inclined jet, which is useful for making the injected jets flow into the cavity. In addition, the introduction of backward inclined jets reduces the total pressure loss. On the other hand, the mass flow rate through the porous holes decreases with increase in the number of the backward inclined jets.

关键词： Supersonic Mixing Cavity Porous Wall Backward Inclined Jet

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Study of Interaction between Supersonic Flow and Rods or Jets Surrounded by Porous Cavity

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Open Journal of Fluid Dynamics 2012年第4期2卷 337-342页

作者： nao kuniyoshi Minoru Yaga Akito Koda Isao Teruy Masaaki Ishikawa Department of Mechanical System Engineering University of the Ryukyus Okinawa Japan Graduate School of Engineering and Science University of the Ryukyus Okinawa Japan Makino Milling Machine Co. Ltd. Tokyo Japan

In this experiment, the effects of the combination of jets or rods and a porous cavity on the supersonic flow field are studied by means of visualization of schlieren method and the measurements of wall static pressures and the flow direction in the cavity with the thermal tuft probe. Three cases of jets or rods arrangements are tested in the experiments. As a result, a bow shock wave which is generated by the jets or rods is observed by mean of schlieren method. And it is confirmed that the expansion region appears downstream of the rods but is not in case of the jets pattern. Moreover the pressure ratios of starting shock wave passing through porous cavity for jets pattern differ from that of rods pattern. In the cavity, the flow direction at the measurement position in the cavity is always opposite to the main flow, as long as the starting shock wave is located upstream of the porous cavity for all cases. Difference in the backward flow ratio between the jets and rods patterns is observe after the starting shock wave passes through the porous cavity.

关键词： Shock Wave Compressible Flow Porous Cavity Bow Shock Wave

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