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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Cloud cavitation vortex shedding inside an injector nozzle
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Cloud cavitation vortex shedding inside an injector nozzle

机译：在喷射器喷嘴里面的云空化涡旋棚子

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摘要

The development and collapse of cloud cavitation and its link to surface erosion within a transparent test single-orifice nozzle operating with a closed Diesel fuel hydraulic circuit, has been characterized using high-speed imaging. Data have been obtained for a range of cavitation and Reynolds numbers under fixed lift positions. Post processing of a large number of images acquired with short exposure time (1 mu s) allowed the elucidation of the distinct flow phenomena associated with the highly transient two-phase flow. At the inlet of the flow orifice, the vapour cloud was found to occupy the largest part of the nozzle hole cross-section. Coherent vortical structures of a hairpin shape have been detected to onset at the closure region of this vapour cloud and shed downstream in a fully transient manner. The effect of the operating parameters on the temporal and spatial characteristics with regards to the emergence and collapse of the hairpin vortices has been quantified. It has been established that the cavitation-vortex shedding was taking place in a periodical manner, characterized by a Strouhal number. (C) 2017 Elsevier Inc. All rights reserved.
机译：云空穴的开发和崩溃及其在具有闭合柴油燃料液压回路操作的透明试验单孔喷嘴内表面腐蚀的链路，采用高速成像特征。已经在固定提升位置下的一系列空化和雷诺数获得了数据。通过短曝光时间（1μs）获取的大量图像的后处理允许阐明与高瞬态的两相流相关的不同流动现象。在流动孔口的入口处，发现蒸汽云占据喷嘴孔横截面的最大部分。已经检测到发夹形状的相干涡流结构，以便在该蒸汽云的封闭区域上起作用，并以完全瞬时的方式缩小下游。运行参数对发夹涡流的出现和塌陷的时间和空间特征的影响已经过分了。已经确定了空化涡旋脱落是以期刊的方式进行，其特征在于Strouhal数。 （c）2017年Elsevier Inc.保留所有权利。

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