气固两相湍流非定常压力脉动特性数值模拟研究  

Numerical Investigation on Unsteady Pressure Oscillation of Gas⁃Solid Two⁃Phase Turbulent Flow

作　　者：阳勇 臧雯雯 韩省思 毛军逵[1] YANG Yong;ZANG Wenwen;HAN Xingsi;MAO Junkui(College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,P.R.China)

机构地区：[1]南京航空航天大学能源与动力学院,南京210016

出　　处：《Transactions of Nanjing University of Aeronautics and Astronautics》2024年第3期311-324,共14页南京航空航天大学学报（英文版）

基　　金：supported in part by the National Natural Science Foundation of China(Nos.52376114,92041001);the Natural Science Foundation of Jiangsu Province(No.BK20200069);the National Science and Technology Major Projects(Nos.J2019-Ⅲ-0015-0059,2017-Ⅲ-0005-0029).

摘　　要：与发动机振荡燃烧相关的气固两相流中的压力脉动现象长期以来备受关注。为了解发动机气固两相流动中的非定常压力脉动特性,以典型的后台阶气固两相流动为研究对象,使用发展的自适应湍流模拟(Self-adaptive turbulence eddy simulation,SATES)和离散相模型(Discrete phase model,DPM)相结合的方法,对两相流场进行了三维非定常高精度数值计算。以实验数据作为参考验证了计算方法的精度和可靠性。通过将两相流场的压力脉动信号与纯气相流场进行对比,发现加入颗粒后流场压力脉动主导频率略有变化,无量纲压力脉动幅值明显减小;进一步研究了固体颗粒直径和质量分数对脉动特性的影响规律,发现随着颗粒直径变大,流场振幅先减小后增大。颗粒直径为10μm时,振幅最小;随着质量分数的增大,流场振幅呈现出下降趋势。研究表明气固两相流中颗粒的参数变化对振荡主频影响较小,对脉动振幅影响显著。Relevant to thermoacoustic combustion instability in engines,the pressure oscillations in gas-solid two-phase turbulent flow have long been a topic of great concerns.To understand the pressure oscillation characteristics in gas-solid two-phase flow,three-dimensional unsteady numerical calculations are conducted for typical two-phase gas-solid backstep flow using the combined self-adaptive turbulence eddy simulation(SATES)and discrete phase model(DPM)method.The accuracy and reliability of the numerical method is firstly validated by comparisons with the experimental data.Then,the unsteady pressure signal of the two-phase gas-solid flow is compared with that of the pure gas phase flow,and it is found that with the addition of solid particles,the dominant frequency of pressure oscillation is slightly changed,and the oscillation amplitude significantly decreases.Finally,the effects of diameter and mass fraction of solid particles on the pressure oscillation are investigated.It is found that with increasing the solid particle diameter,the amplitude of pressure oscillation firstly decreases and then increases,and the amplitude exhibits the smallest with the diameter of 10μm;with increasing the mass fraction of solid particle,the pressure oscillation amplitude shows a decreasing trend.The results demonstrate that the properties of solid particles in two-phase flow have a small impact on the dominant frequency of pressure oscillation,while a significant impact on the oscillation amplitude.

关 键 词：压力脉动 后台阶气固两相流 自适应湍流模拟 离散相模型 频谱特性 

分 类 号：V435[航空宇航科学与技术—航空宇航推进理论与工程] TJ760.33[兵器科学与技术—武器系统与运用工程]