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首页> 外文期刊>International Journal of Heat and Mass Transfer >Investigation on effects of upstream flow on submerged jet flow from short cylindrical orifice in common-rail injector
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Investigation on effects of upstream flow on submerged jet flow from short cylindrical orifice in common-rail injector

机译：共轨喷油器短圆柱孔上游流动对淹没射流影响的研究

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摘要

During the fuel injection process of a common rail (CR) fuel system, submerged jet occurs in the injector control valve. Different with the free jet of the nozzle, this submerged jet determines the needle movement and causes great effects on the fuel injection. This work presents an investigation on the submerged jet characteristics of a cylindrical orifice under conditions of varied boundary pressures. An optical test rig is used to examine the submerged jet, and a three-dimension numerical model is built to investigate the details of the submerged jet. The results reveal that for a given inlet pressure, as the back pressure declines, bubbles incept at the orifice inlet, then develop to the orifice outlet, and finally jet into the background liquid. The development process of the impingement force is divided into three periods. This downstream three-period impingent force results from the upstream cavitation flow. The crucial turning points (such as the cavitation inception, choking, cavitation at the orifice outlet) of the downstream impingent force coincide with those of the incoming energy such as the liquid momentum flux, the turbulence kinetic energy. Further, the developing tendency of the downstream impingent force is similar to those of the incoming energy. (C) 2018 Elsevier Ltd. All rights reserved.
机译：在共轨（CR）燃油系统的燃油喷射过程中，喷油器控制阀中会发生浸没式射流。与喷嘴的自由射流不同，该浸没射流决定了针的运动，并对燃油喷射产生了很大影响。这项工作提出了在变化的边界压力条件下圆柱孔口的浸没式射流特性的研究。使用光学试验台检查水下射流，并建立三维数值模型来研究水下射流的细节。结果表明，对于给定的入口压力，当背压下降时，气泡会在孔口入口处出现，然后发展到孔口出口，最后喷射到本底液体中。冲击力的发展过程分为三个阶段。下游的三周期冲击力是由上游的空化流产生的。下游冲击力的关键转折点（例如，气蚀开始，阻塞，孔出口处的气蚀）与进入的能量（例如液体动量通量，湍流动能）相一致。此外，下游冲击力的发展趋势与进入能量的趋势相似。 （C）2018 Elsevier Ltd.保留所有权利。

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