喷射器内流场数值分析

发布时间：2018-01-06 15:10

本文关键词：喷射器内流场数值分析　出处：《应用科技》2016年06期 　论文类型：期刊论文

【摘要】：为了增加对喷射器内部流场的系统认识,同时为喷射器数学模型的建立和设计提供参考,采用数值分析的方法,研究了喷射器的运行特性及内部流场。研究结果表明,当混合流场中涡的卷吸作用主导混合时,混合层边界可用于表征相的分布范围;可以通过分析湍动能和涡耗散率定性描述喷射器内流场混合层内涡的特性;当压力不匹配度小于1时,高速蒸汽的可压缩性对涡卷起的抑制作用,需要较长的混合区均衡流场,但可压缩性对混合层发展的影响有上限;当压力不匹配度大于1时,喷管出口处的激波可使混合层增长速度变大,使流场在较短的距离内便达到均衡状态,有效缩短喷射器长度。
[Abstract]:In order to increase the systematic understanding of the internal flow field of the ejector and to provide a reference for the establishment and design of the ejector mathematical model, the numerical analysis method is adopted. The operating characteristics and internal flow field of the ejector are studied. The results show that the boundary of the mixing layer can be used to characterize the distribution range of the phase when the entrainment of the vortex dominates the mixing. By analyzing the turbulent kinetic energy and the dissipation rate, the characteristics of the vortex in the mixed layer of the jet flow field can be described qualitatively. When the pressure mismatch degree is less than 1:00, the compressibility of the high speed steam can restrain the vorticity, which requires a long equilibrium flow field in the mixing region, but the influence of compressibility on the mixed layer development is upper bound. When the pressure mismatch is greater than 1:00, the shock wave at the nozzle outlet can increase the growth speed of the mixing layer, make the flow field equalize in a short distance, and effectively shorten the length of the ejector.
【作者单位】：哈尔滨工程大学核安全与仿真技术国防重点实验室;
【分类号】：TH69
【正文快照】： 喷射器的工作原理是压力不同的两股介质间进行质量交换、动量交换和热量交换后,混合流体以相对居中的压力经扩压管增压后排出。两股流体中压力较高者称为工作介质(P),压力较低者称为引射介质(H)。引射介质与工作介质的质量流量之比μ=mH/mP称为喷射器的引射系数。喷射器以其

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