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首页> 外文期刊>Atomization and Sprays: Journal of the International Institutes for Liquid Atomization and Spray Systems >EXPERIMENTAL STUDY ON FLOW FIELDS OF FUEL DROPLETS AND AMBIENT GAS OF DIESEL SPRAY-FREE SPRAY AND FLAT-WALL IMPINGING SPRAY
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EXPERIMENTAL STUDY ON FLOW FIELDS OF FUEL DROPLETS AND AMBIENT GAS OF DIESEL SPRAY-FREE SPRAY AND FLAT-WALL IMPINGING SPRAY

机译：柴油机无雾喷雾和平壁撞击式喷雾燃料流及周围气体流场的实验研究

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摘要

The ambient gas flow fields of the free spray and flat wall-impinging spray were measured by using laser induced fluorescence-particle image velocimetry (LIF-PIV) technique in non-evaporating condition. The ambient gas velocity distribution and gas mass flow rate into the spray were analyzed. The droplet flow velocity and vorticity of free spray and impinging spray were measured by particle image velocimetry (PIV) technique, the correlation of spray droplet flow and ambient gas flow under the free spray and impinging spray conditions was studied. The effects of impinging distances (30 mm, 40 mm) and injection pressures (100 MPa, 200 MPa, 300 MPa) were taken into account. Comparing with the free spray, the impinging spray restricts the ambient gas flow at the specific timing; however, showing the same or higher ambient gas flow as function of the penetrating length. Furthermore, the increased vorticity intensity implies that the turbulent mixing and mixture formation inside the spray tend to be improved. The increased fuel injection pressure effectively improves the ambient gas flow and the vorticity intensity of the spray. The effect of injection pressure on the improvement of ambient gas flow becomes moderate under the impingement condition. The shorter spray-wall impinging distance restricts the increase of the spray volume and the ambient gas mass flow rate.
机译：在非蒸发条件下，通过使用激光诱导荧光颗粒图像测速技术（LIF-PIV）技术，测量了自由喷雾和扁平壁撞击喷雾的环境气体流场。分析了进入喷雾的环境气体速度分布和气体质量流量。利用粒子图像测速技术（PIV）测量了自由喷雾和撞击喷雾的液滴流速和涡度，研究了自由喷雾和撞击条件下喷雾液滴与周围气体流量的相关性。考虑了撞击距离（30 mm，40 mm）和注射压力（100 MPa，200 MPa，300 MPa）的影响。与自由喷雾相比，撞击喷雾在特定的时间限制了周围的气体流量。但是，根据穿透长度的不同，显示出相同或更高的环境气体流量。此外，增加的涡流强度意味着喷雾内部的湍流混合和混合物形成趋于改善。增加的燃料喷射压力有效地改善了周围的气流和喷雾的涡流强度。在撞击条件下，注入压力对改善周围气流的影响变得中等。较短的喷雾壁撞击距离限制了喷雾量和周围气体质量流量的增加。

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