跨/超临界环境下液氮射流的机理研究  

Mechanism of liquid nitrogen jets under trans/supercritical conditions

作　　者：刘宏升[1] 马杰 李亮 吴丹[1] 解茂昭[1] LIU Hongsheng;MA Jie;LI Liang;WU Dan;XIE Maozhao(Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education,Dalian University of Technology,Dalian 116024,China;Weichai Power Company Limited,Weifang 261000,China)

机构地区：[1]大连理工大学海洋能源利用与节能教育部重点实验室,辽宁大连116024 [2]潍柴动力股份有限公司,山东潍坊261000

出　　处：《中南大学学报（自然科学版）》2022年第4期1516-1524,共9页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51576029);辽宁省教育厅科学研究经费项目(L2020001)。

摘　　要：以开源软件OpenFOAM为平台,开发出适于跨/超临界射流的模型,以研究跨/超临界条件下的喷雾混合特性。模型基于真实流体状态方程和扩展的压力隐式分割算法(PISO),并结合雷诺平均(RANS)湍流模型,对跨/超临界条件下的液氮射流进行模拟,重点分析射流的伪沸腾特性。研究结果表明:在跨临界射流伪沸腾发生之前,射流表面形成显著的密度分层可抑制湍流扩散和混合层发展;在超临界射流下,混合层内的密度梯度较小,这导致射流能够更快地达到自相似状态。A CFD model applicable for trans/supercritical jets was developed to study spray mixing characteristics under trans/supercritical conditions using the open source software OpenFOAM as a platform.The model was based on the real-fluid equation of state and the extended pressure-implicit with splitting of operators algorithm(PISO),combined with the Reynolds average(RANS)turbulence model,the liquid nitrogen jet under trans/supercritical conditions was simulated,and the pseudo-boiling characteristics were analyzed.The results show that before the pseudo-boiling of the transcritical jet occurs,a significant density stratification on the jet surface can depress the turbulent diffusion and development of the mixing layer.Under supercritical condition,the density gradient in the mixing layer is small,which causes the jet to reach a self-similar state faster.

关 键 词：跨/超临界喷雾 伪沸腾 真实流体状态方程 数值模拟 

分 类 号：TK123[动力工程及工程热物理—工程热物理]