摘要
对不同密度气体在圆管射流情况下的湍流混合过程进行了大涡模拟计算,研究气体密度比对下游气体混合过程的影响.考虑了氦气和二氧化碳分别射入空气中的两种情况,其雷诺数分别为7 000和32 000.计算得到的速度、质量分数等各项参数均与试验结果吻合良好,研究表明在相同的射流动量通量下,低密度射流比高密度射流混合发展得更快.同时验证了变密度射流的准相似性,并分析了其中的相干涡结构.计算研究了CO2射流在不同射流速度下的湍流场,发现低速射流相比于高速射流具有更高的混合速率.
The large eddy simulation of the turbulent mixing process for different density gases in the case of circular tube jet was carried out to investigate the effect of gas density ratio on the downstream gas mixing process. The results show that with helium and carbon dioxide injecting into air, the Reynolds numbers are 7 000 and 32 000, respectively. The calculated results of velocity and mass fraction are in good agreement with the experimental results. For the same jet flow flux, the low-density jets are developed faster than high-density jets. The pseudo-similarity of the variable-density jet is verified, and the coherent vortex structure is analyzed. The turbulent flow fields of carbon dioxide jets at different jet velocities are calculated to show that the low velocity jet has higher mixing rate than the high velocity jet.
作者
张春
王平
曾海翔
李伟超
ZHANG Chun;WANG Ping;ZENG Haixiang;LI Weichao(School of Energy and Power Engineering,Jiangsu University,Zhenjiang,Jiangsu 212013,China;Institute for Energy Research,Jiangsu University,Zhenjiang,Jiangsu 212013,China)
出处
《江苏大学学报（自然科学版）》
EI
CAS
北大核心
2019年第6期662-667,700,共7页
Journal of Jiangsu University：Natural Science Edition
基金
国家自然科学基金资助项目(51576092,91741117)
江苏省自然科学基金资助项目(BK20151344)
关键词
气体
变密度射流
大涡模拟
流向涡
平面涡
相干结构
gas
variable density jet
large eddy simulation
streamwise vorticity
plane vorticity
coherent structure
