基于改进TAB模型的液滴变形破碎动力学研究

Research on the Droplet Deformation and Breakup Dynamics based on Improved TAB Model

为研究单个液滴在高温气流中的变形破碎过程,以正十二烷液滴为例,建立了考虑对流、辐射耦合加热对液滴物性和气流热物性变化的改进泰勒类比破碎(TAB)模型,编制了计算程序。在与文献结果对比验证的基础上,数值模拟了高温环境中液滴变形破碎过程,得到了不同环境因素下液滴表面温度和无量纲直径的变化规律。研究结果表明:考虑液滴升温所预测的液滴变形明显加快;在较高辐射源温度下,辐射加热对液滴表面温度和变形的影响较小;随着气液相对速度加快,对流换热系数增大,液滴温升对液滴变形的促进作用增强。

In order to study the deformation and breakup process of single fuel droplet in high temperature nitrogen flow,Taking the n-dodecane droplet as an example,an improved Taylor analogy breakup(TAB)model considering the changes of droplet physical properties and gasflow thermophysical properties under the coupled heating of convection and radiation was established,and a calculation code was developed.Based on the comparison and verification with the literature results,the process of droplet deformation and breaking in high temperature gasflow was numerically simulated..The results show that the droplet deformation predicted by considering the droplet temperature rise is accelerated;At a high radiation source temperature,the radiation heating has limited effect on droplet surface temperature and deformation;With the increase of gas-liquid relative velocity,the convection coefficient increases,and the promoting effect of droplet temperature rise on droplet deformation increases.