Numerical Investigation of Transonic Non-ideal Gas Flows Around a Circular Cylinder at High Reynolds Number

IF 2 3区工程技术 Q3 MECHANICS

Flow, Turbulence and Combustion Pub Date : 2023-10-28 DOI:10.1007/s10494-023-00496-1

Camille Matar, Xavier Gloerfelt, Paola Cinnella

引用次数: 0

Abstract

High Reynolds transonic ideal and non-ideal gas flows around a smooth circular cylinder are investigated by means of Large Eddy Simulations over a range of Mach numbers encompassing the drag divergence. The global aerodynamic performance of the cylinder in both air and a dense vapor are compared, as well as the influence of the thermodynamic behavior of the working fluid on the wake development. The drag divergence is delayed in the dense vapor flow compared to air, and the overall pressure drag is increased due to the lower back pressure. Loss generation mechanisms are also studied via entropy production in the boundary layer and by means of a loss breakdown analysis commonly used in turbomachinery. The specific entropy production rate is found to be lower in the dense gas flow compared to air. Finally, the momentum loss coefficient is reduced upon suppressing unsteady transonic vortex shedding.

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高雷诺数下环绕圆形圆柱体的跨音速非理想气体流的数值研究

通过大涡流模拟研究了光滑圆筒周围的高雷诺跨音速理想和非理想气体流，其马赫数范围包括阻力发散。比较了气缸在空气和高密度蒸汽中的整体气动性能，以及工作流体的热力学行为对尾流发展的影响。与空气相比，稠密蒸汽流中的阻力发散延迟了，并且由于背压较低，整体压力阻力增加了。此外，还通过边界层中的熵产生以及涡轮机械中常用的损耗分解分析，对损耗产生机制进行了研究。研究发现，与空气相比，稠密气流中的比熵产生率更低。最后，在抑制非稳态跨音速涡流脱落时，动量损失系数会降低。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Flow, Turbulence and Combustion 工程技术-力学

CiteScore

5.70

自引率

8.30%

发文量

审稿时长

2 months

期刊介绍： Flow, Turbulence and Combustion provides a global forum for the publication of original and innovative research results that contribute to the solution of fundamental and applied problems encountered in single-phase, multi-phase and reacting flows, in both idealized and real systems. The scope of coverage encompasses topics in fluid dynamics, scalar transport, multi-physics interactions and flow control. From time to time the journal publishes Special or Theme Issues featuring invited articles. Contributions may report research that falls within the broad spectrum of analytical, computational and experimental methods. This includes research conducted in academia, industry and a variety of environmental and geophysical sectors. Turbulence, transition and associated phenomena are expected to play a significant role in the majority of studies reported, although non-turbulent flows, typical of those in micro-devices, would be regarded as falling within the scope covered. The emphasis is on originality, timeliness, quality and thematic fit, as exemplified by the title of the journal and the qualifications described above. Relevance to real-world problems and industrial applications are regarded as strengths.