ディーゼル燃料噴射ノズルを模擬した２次元ノズル内水中での気泡核成長の実験とCFD流れ場での気泡力学解析

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書誌事項

タイトル別名
  • Experiment and CFD-aided Bubble Dynamics Analysis on Bubble Nucleus Growth in Water through Two-dimensional Nozzle for Diesel Fuel Injector Nozzle
  • ディーゼル ネンリョウ フンシャ ノズル オ モギ シタ 2ジゲン ノズル ナイスイ チュウ デ ノ キホウカク セイチョウ ノ ジッケン ト CFD ナガレバ デ ノ キホウ リキガク カイセキ
公開日
2025-09-19
DOI
  • 10.11395/jjsem.25.136
公開者
日本実験力学会

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説明

<p>This paper aims to clarify the growth of bubble nuclei in water flowing through the two-dimensional nozzle which is a model of diesel fuel injector nozzle. The nuclei growth is initiated due to tension induced by the sudden pressure drop at the sharp corner of the nozzle edge and it is investigated by means of experiment, CFD flow simulation and bubble dynamics. In the experiment, the observation section of the nozzle is around sharp corner to generate bubbles, and once cavitated, the water cannot return to the observation section. A single-phase water flow is simulated using LES-based CFD to obtain the velocity distribution at the sharp corner in the nozzle edge, flow separation, and vortex formation downstream of the separation point, pressure distribution before and after the sharp corner in the nozzle edge. The growth mechanism of bubble nuclei is clarified with Blake’s cavitation threshold theory and Rayleigh-Plesset equation in the CFD-flow field under experimental conditions. Finally, the bubble nuclei attain the critical radii a little downstream of the sharp corner in the nozzle and then explosively start growing in cases where Blake’s threshold is fulfilled.</p>

収録刊行物

  • 実験力学

    実験力学 25 (3), 136-144, 2025-09-19

    日本実験力学会

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