Theoretical Analysis and Numerical Simulation of Real Gas Effect in Compressible Pipe Flow

被引：0
|
作者：
Jin Y.-C. [1 ,2 ]
Cheng D. [3 ]
Wu K. [1 ]
Fan X.-J. [1 ,2 ]
机构：
[1] State Key Laboratory of High Temperature Gas Dynamics, Institute of Mechanics, Chinese Academy of Sciences, Beijing
[2] School of Engineering Science, University of Chinese Academy of Sciences, Beijing
[3] China Academy of Aerospace Aerodynamics, Beijing
来源：
Tuijin Jishu/Journal of Propulsion Technology | 2022年 / 43卷 / 07期
关键词：
Compressible flow; Hydrocarbon fuel; Numerical simulation; Real gas effect; Supercritical fluid;
D O I：
10.13675/j.cnki.tjjs.201012
中图分类号：
学科分类号：
摘要：
To explore the characteristics of compressible flow and influential factors of complex hydrocarbon fuels in scramjet engines，the role of real gas effect in compressible flow is revealed under typical operating conditions. The crucial influence of fundamental derivative of gas dynamics（Γ）is illustrated theoretically based on the equilibrium thermodynamics，and the characteristics close to critical point of various hydrocarbon fuels are clarified by exploiting the fundamental derivative. It is found that the minimum value of Γ decreases and even becomes negative as the molecular structure of hydrocarbon fuels getting more complex，and the negative value region is mainly concentrated near the saturated steam line. Meanwhile，a serial of numerical simulations are conducted for two-dimensional supercritical pipe flow by leveraging the equation of state in cubic form. It is confirmed that the abnormal decrease of Mach number in supersonic expansion flow is mainly dominated by the nonlinear dependence of sound speed on the fluid density. Further parametric studies also exhibit that the thermal dynamic routes of pressure and temperature along the channel approach the saturated steam line in the p-T phase diagram with increased inlet pressure or decreased inlet temperature，which induces more remarkable non-classical aerodynamic phenomena. © 2022 Journal of Propulsion Technology. All rights reserved.
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