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Abstract <p>Pressure fluctuations on a semi-infinite flat obstacle impinged by a supersonic underexpanded jet are studied. The nozzle exit Mach number is <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({{\text{M}}_a} = 1\)</EquationSource> <!--JAMT2570020Kiselev-m1--> </InlineEquation>, the jet off-design parameter <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(n = 2.1\)</EquationSource> <!--JAMT2570020Kiselev-m2--> </InlineEquation>, and the distance from the nozzle exit to the obstacle <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(h{\text{/}}{D_a} = 2{-} 15\)</EquationSource> <!--JAMT2570020Kiselev-m3--> </InlineEquation> (<InlineEquation ID="IEq4"> <EquationSource Format="TEX">\({D_a}\)</EquationSource> <!--JAMT2570020Kiselev-m4--> </InlineEquation> is the nozzle exit diameter). It&#xa0;is&#xa0;shown that tangential injection of six microjets can lead to a significant reduction in pressure fluctuations on the obstacle. The mass flow rate through all microjets is 0.3% of the mass flow rate through the main jet. A self-oscillating mass-flow-rate regime of jet–obstacle interaction is found to occur at <InlineEquation ID="IEq5"> <EquationSource Format="TEX">\(h{\text{/}}{D_a} &lt; 3\)</EquationSource> <!--JAMT2570020Kiselev-m5--> </InlineEquation>, a self-oscillating regime with acoustic feedback at <InlineEquation ID="IEq6"> <EquationSource Format="TEX">\(3 &lt; h{\text{/}}{D_a} &lt; 8\)</EquationSource> <!--JAMT2570020Kiselev-m6--> </InlineEquation>, and a turbulent aperiodic interaction regime at <InlineEquation ID="IEq7"> <EquationSource Format="TEX">\(h{\text{/}}{D_a} &gt; 8\)</EquationSource> <!--JAMT2570020Kiselev-m7--> </InlineEquation>.</p>

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Effect of Microjets on the Interaction of a Supersonic Jet with a Flat Obstacle

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • N. P. Kiselev,
  • V. I. Zapryagaev,
  • I. N. Kavun,
  • R. A. Styazhkin,
  • A. A. Pivovarov

摘要

Abstract

Pressure fluctuations on a semi-infinite flat obstacle impinged by a supersonic underexpanded jet are studied. The nozzle exit Mach number is \({{\text{M}}_a} = 1\) , the jet off-design parameter \(n = 2.1\) , and the distance from the nozzle exit to the obstacle \(h{\text{/}}{D_a} = 2{-} 15\) ( \({D_a}\) is the nozzle exit diameter). It is shown that tangential injection of six microjets can lead to a significant reduction in pressure fluctuations on the obstacle. The mass flow rate through all microjets is 0.3% of the mass flow rate through the main jet. A self-oscillating mass-flow-rate regime of jet–obstacle interaction is found to occur at \(h{\text{/}}{D_a} < 3\) , a self-oscillating regime with acoustic feedback at \(3 < h{\text{/}}{D_a} < 8\) , and a turbulent aperiodic interaction regime at \(h{\text{/}}{D_a} > 8\) .