幂律流体液膜射流的时间不稳定性分析（英文）

发布时间：2018-01-12 18:22

本文关键词：幂律流体液膜射流的时间不稳定性分析（英文）　出处：《内燃机学报》2017年03期 　论文类型：期刊论文

【摘要】：基于时间模式不稳定性理论,研究了无黏静止气体中二维幂律流体液膜射流不稳定过程.在对幂律流体本构方程线性近似的基础上,通过对非对称模式和对称模式的色散方程的推导和求解,研究了广义雷诺数、韦伯数、气/液密度比以及幂律指数对于液膜破碎的影响.结果表明:在两种模式下,不论剪切变稀流体还是剪切变稠流体,液体的黏性和表面张力都会抑制液膜破碎,而气/液相互作用力则促进液膜破碎.而且,幂律指数越小,液膜射流越容易破碎.同时,尽管非对称模式在液膜破碎过程总是占据主导地位,但是当两种模式的最大扰动增长率的量级同阶时,对称模式对于液膜破碎也起着重要作用.
[Abstract]:Time model is based on the stability theory of inviscid stationary gas in two-dimensional power-law fluid liquid jet instability. In the process of power-law fluid constitutive equations based on the linear approximation, the dispersion equation is derived and solved for asymmetric and symmetric mode model, study the generalized Reynolds number, Weber number, gas liquid / density ratio and power-law index for breakup of liquid film. The results show that in the two mode, regardless of shear thinning fluid or shear thickening fluid, viscosity and surface tension of liquid film will inhibit crushing, and gas / liquid interaction facilitates the breakup of liquid film. Moreover, the power-law index is small the liquid jet, more easily broken. At the same time, although the asymmetric mode in the film breaking process is always dominant, but when the two modes of the maximum growth rate of the same order of magnitude, broken up for the symmetric mode liquid membrane It plays an important role.

【作者单位】：天津大学内燃机燃烧学国家重点实验室;天津大学内燃机研究所;中国第一汽车股份有限公司无锡油泵油嘴研究所;
【基金】：天津市应用基础与前沿技术研究计划重点资助项目(15JCZDJC39600)
【分类号】：O358
【正文快照】： The breakup of a liquid sheet is widely employed in engineering and practice.Generally,liquids can be classified into Newtonian liquids and non-Newtonian liquids.For example,traditional fuels such as gasoline and diesel are Newtonian fluids.The gel prope

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