Journal of Thermophysics and Heat Transfer ( IF 2.1 ) Pub Date : 2021-06-01 , DOI: 10.2514/1.t6217 Yichao Jin 1 , Wei Yao 2
In the framework of large eddy simulation, a supercritical jet has been modeled by using the extended corresponding states (ECS) method, the cubic Peng–Robinson (PR) equation of state, as well as the ideal gas law. The accuracy of ECS and PR was first verified for a binary mixture against the standard data. A zone-adaptive hybrid ECS/ideal method was developed to efficiently model the supercritical jet while maintaining accuracy, because most of the flow region can be approximately described by the ideal gas law. Quick expansion and local speedup driven by the drastic heating were observed during the development of the supercritical jet. By using the hybrid ECS method, the predictions are consistent with those calculated by the original ECS method, with a speedup ratio of 5–10 achieved. The hybrid ECS method was generalized by defining the expression formulas that describe the isosurface in the pressure–temperature–composition space for typical fuel mixtures.
中文翻译:
超临界 [数学] 射流由混合扩展对应状态方法建模
在大涡模拟框架下,超临界 射流已通过使用扩展对应状态 (ECS) 方法、三次 Peng-Robinson (PR) 状态方程以及理想气体定律建模。ECS 和 PR 的准确性首先通过二进制验证混合标准数据。开发了一种区域自适应混合 ECS/理想方法,以在保持精度的同时有效地模拟超临界射流,因为大多数流动区域可以由理想气体定律近似描述。在超临界射流的发展过程中观察到由剧烈加热驱动的快速膨胀和局部加速。通过使用混合ECS方法,预测与原始ECS方法计算的预测一致,实现了5-10的加速比。混合 ECS 方法通过定义描述典型燃料混合物压力-温度-成分空间中的等值面的表达式公式进行了推广。