高压环境下剪切稀化非牛顿撞击射流直接数值模拟

doi:10.7527/S1000-6893.2019.22783

流体力学与飞行力学

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高压环境下剪切稀化非牛顿撞击射流直接数值模拟

朱呈祥, 郑浩铭, 尤延铖

厦门大学航空航天学院, 厦门 361005

收稿日期:2018-11-07 修回日期:2018-12-06 出版日期:2019-06-15 发布日期:2019-02-26
通讯作者: 尤延铖 E-mail:yancheng.you@xmu.edu.cn
基金资助:
国家自然科学基金（51606161）；中央高校基本科研业务费专项资金（20720170055）；福建省自然科学基金（2016J06011）

Direct numerical simulation of impinging jet with non-Newtonian shear thinning properties at high ambient pressure

ZHU Chengxiang, ZHENG Haoming, YOU Yancheng

School of Aerospace Engineering, Xiamen University, Xiamen 361005, China

Received:2018-11-07 Revised:2018-12-06 Online:2019-06-15 Published:2019-02-26
Supported by:
National Natural Science Foundation of China (51606161); Fundamental Research Funds for the Central Universities (20720170055); Natural Science Foundation of Fujian Province (2016J06011)

摘要/Abstract

摘要： 高压环境下的撞击射流是液体火箭推进系统中广泛采用的一种燃料雾化方法，其雾化效果将直接决定最终燃烧效率。采用直接数值模拟（DNS）工具，对10 MPa高压环境下剪切稀化非牛顿直角撞击射流的三维非定常雾化特征、机理及非牛顿特性进行了研究。结果表明：高压环境下该撞击射流的雾化流场呈圆形辐射状分布并形成Mushroom头部和Ω状的局部凸起，气体中的涡量分布表现为有序贴附区和无序爆炸区两类，液膜向液丝的破碎主要受平均气体力和平均黏性力作用影响，而液丝向液滴的破碎则主要受局部流场参数影响，撞击雾化过程中液体无量纲表面积不断增长并可分为5个阶段。此外，撞击射流头部在局部强剪切力作用下其无量纲黏性系数最低降至仅0.7。

关键词: 撞击射流, 非牛顿流体, 高压环境, 直接数值模拟(DNS), 剪切稀化

Abstract: Impinging liquid jets have been widely used in liquid rocket propulsion systems as a fuel atomization method. The breakup efficiency of impinging liquid jets directly determines the mixing and combustion efficiency of the fuel. The present work applies a Direct Numerical Simulation (DNS) tool to study the three-dimensional unsteady impinging jet breakup with non-Newtonian shear thinning properties at high ambient pressure 10 MPa, including the three-dimensional structure, breakup mechanism, and non-Newtonian feature of the liquid. The results indicate that the impinging jet breakup exhibits a radial circular flow structure and forms a Mushroom head and an Ω shape local protruding. The distribution of gas vorticity is split into two categories that include the regulated attached region and irregular blasting region. The breakup from liquid sheet to ligament is determined by the average air force and viscous force, whereas the breakup from ligament to droplet is determined by local flow parameters. The dimensionless liquid surface area increases with time and can be divided into five phases. Additionally, the non-dimensional viscosity of the liquid at the impinging jet head decreases to only 0.7 due to high local shear stresses.

Key words: impinging jets, non-Newtonian fluid, high pressure environment, direct numerical simulation (DNS), shear thinning

中图分类号:

V231.2

朱呈祥, 郑浩铭, 尤延铖. 高压环境下剪切稀化非牛顿撞击射流直接数值模拟[J]. 航空学报, 2019, 40(6): 122783-122783.

ZHU Chengxiang, ZHENG Haoming, YOU Yancheng. Direct numerical simulation of impinging jet with non-Newtonian shear thinning properties at high ambient pressure[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2019, 40(6): 122783-122783.

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E-mail：hkxb@buaa.edu.cn

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高压环境下剪切稀化非牛顿撞击射流直接数值模拟

Direct numerical simulation of impinging jet with non-Newtonian shear thinning properties at high ambient pressure

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