Surface tension effects on cryogenic liquid injection dynamics in supercritical environment
Surface tension effects on cryogenic liquid injection dynamics in supercritical environment
复制标题
表面张力对超临界环境中低温液体喷射动力学的影响
DOI：
10.1063/5.0159754
复制
发表时间：
2023-09
影响因子：
4.6
通讯作者：
J. V. Madana Gopal;Robert Morgan;G. de Sercey;G. Tretola;K. Vogiatzaki
中科院分区：
文献类型：
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作者：
J. V. Madana Gopal;Robert Morgan;G. de Sercey;G. Tretola;K. Vogiatzaki
在低温火箭发动机和新型发动机结构（如回热分离循环发动机）中，通常会遇到将低温流体注入超临界环境（与注入低温流体的临界点相比）的情况。注入超临界环境的低温剂的物理特性尚不清楚。虽然表面张力通常被认为在超临界流体中不存在或可以忽略不计，但最近的实验研究已经确定了表面张力的存在及其对超临界环境中液态烃的影响。本研究工作提出了一种替代计算简单的自适应表面张力算法，用于模拟注入超临界环境的液体。本文给出的数值模拟分别对应于液氮和液态甲烷注入超临界条件后发生相变的单态和双态情况。在对相关数值工作进行批判性回顾之后，本文首先简要解释了涉及超临界流体的二元流体界面中表面张力效应背后的物理原理，并提出了为什么这种效应与超临界低温射流相关？然后，讨论了基于自适应表面张力的新建模框架的基本原理和细节及其含义。低温与近临界温度液氮和液态甲烷注入动力学的数值模拟结果表明，在这两种情况下，流体动力学和热力学的作用是截然不同的。在这些条件下，还探讨了表面张力的作用。
The injection of cryogenic fluids into environments where the prevailing conditions are supercritical in comparison to the critical point of the injected cryogenic fluid is encountered in cryogenic rocket engines, and novel engine architectures such as the recuperated split cycle engine. The physical characteristics of cryogens injected into supercritical environment are rather unclear. While surface tension is usually assumed to be absent/negligible for supercritical fluids, recent experimental research has identified the existence of surface tension and its effects on liquid hydrocarbons in supercritical environment. This research work proposes an alternative computationally simple adaptive surface tension algorithm for the simulation of a liquid injected into supercritical environment. The numerical simulations presented here correspond to single- and binary-specie cases of iquid nitrogen and liquid methane respectively, undergoing phase transition post their injection into supercritical conditions. Following a critical review of related numerical works, this paper begins with a brief explanation of the physics behind the surface tension effect in a binary-fluid interface in which a supercritical fluid is involved and we present why this effect is of relevance to supercritical cryogenic jets? Then, the rationale and specifics of the the new modelling framework based on adaptive surface tension is discussed along with its implications. The results of the numerical simulations of low-temperature vs near-critical temperature iquid nitrogen and liquid methane injection dynamics revealed the drastically different fluid- and thermo-dynamics at play in these two cases. The role of surface tension at these conditions is also explored.