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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers, Part D. Journal of Automobile Engineering >An experimental study on spray characteristics after impingement on a piston surface through an asymmetrical multi-hole injector of a direct-injection spark ignition gasoline engine
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An experimental study on spray characteristics after impingement on a piston surface through an asymmetrical multi-hole injector of a direct-injection spark ignition gasoline engine

机译：直喷式火花点火汽油机不对称多孔喷射器撞击活塞表面后喷雾特性的实验研究

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The impinging spray development inside direct-injection spark ignition (DISI) engines directly influences the engine performance and emissions. A detailed understanding of this process is very important in designing an injection system and controlling a strategy. To examine the effects of various factors on the development of a spray impinging on the piston top surface, experiments were conducted under various injection pressures, ambient pressures, and piston top surface shapes inside an optical constant-volume chamber employing a high-speed shadow photography technique. Also, the effects of the injection pressure, ambient pressure, and piston top surface shape on the impinging spray concentration, impinging spray tip penetration, impinging spray radius, impinging spray height, and impinging spray tip speed were analysed. It is shown that atomization after the spray had impinged on the piston top surface became increasingly better as the injection pressure increased. The concentration of the spray plumes before and after the spray had impinged on the piston top surface became increasingly richer as the ambient pressure increased. The impinging spray tip penetration and radius increased with increasing injection pressure, but the impinging spray tip penetration and radius decreased with increasing ambient pressure. This investigation is favourable to providing further basic data for the impinging spray history and the mixture preparation of DISI engines.
机译：直喷式火花点火（DISI）发动机内部的撞击式喷雾直接影响发动机的性能和排放。在设计注射系统和控制策略时，对此过程的详细了解非常重要。为了检查各种因素对撞击在活塞顶表面上的喷雾形成的影响，在各种注射压力，环境压力和光学恒定容积室内的活塞顶表面形状下，使用高速阴影摄影进行了实验技术。而且，分析了喷射压力，环境压力和活塞顶表面形状对冲击喷雾浓度，冲击喷雾尖端渗透，冲击喷雾半径，冲击喷雾高度和冲击喷嘴速度的影响。结果表明，随着喷射压力的增加，喷雾撞击在活塞顶面上后的雾化变得越来越好。随着环境压力的增加，喷雾撞击在活塞顶面上之前和之后的喷雾羽流的浓度变得越来越浓。撞击的喷嘴穿透力和半径随着注入压力的增加而增加，但是撞击的喷嘴穿透力和半径随着环境压力的增加而减小。这项研究有助于为冲击喷雾历史和DISI发动机的混合物制备提供更多的基础数据。

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