Topology Rule-Based Methodology for Flow Separation Analysis in Turbomachinery

IF 1.3 Q2 ENGINEERING, AEROSPACE
P. Duquesne, Joffrey Chanéac, Gabriel Mondin, J. Dombard
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引用次数: 2

Abstract

Boundary-layer flow separation is a common flow feature in many engineering applications. The consequences of flow separation in turbomachinery can be disastrous in terms of performance, stability and noise. In this context, flow separation is particularly difficult to understand because of its three-dimensional and confined aspects. Analyzing the skin friction lines is one key point to understanding and controlling this phenomenon. In the case of separation, the flow at the wall agglutinates around a manifold while the fluid from the boundary layer is ejected toward the flow away from the wall. The analysis of a three-dimensional separation zone based on topology is well addressed for a simple geometry. This paper aims at providing simple rules and methods, with a clear vocabulary based on mathematical background, to conduct a similar analysis with complex turbomachinery geometry (to understand a surface with a high genus). Such an analysis relies on physical principles that help in understanding the mechanisms of flow separation on complex geometries. This paper includes numerous typical turbomachinery surfaces: the stator row, vaneless diffuser, vaned diffuser, axial rotor and shrouded and unshrouded centrifugal impeller. Thanks to surface homeomorphisms, the generic examples presented can easily be converted into realistic shapes. Furthermore, classical turbomachinery problems are also addressed, such as periodicity or rotor clearance. In the last section, the proposed methodology is conducted on a radial diffuser of an industrial compressor. The flow at the wall is extracted from LES computations. This study presents the different closed separation zones in a high-efficiency operating condition.
基于拓扑规则的涡轮机械流动分离分析方法
边界层流动分离是许多工程应用中常见的流动特征。在涡轮机械中,流动分离的后果在性能、稳定性和噪声方面可能是灾难性的。在这种情况下,流动分离是特别难以理解的,因为它的三维和有限的方面。分析表面摩擦线是理解和控制这一现象的关键。在分离的情况下,壁面处的流动在歧管周围聚集,而来自边界层的流体则向远离壁面的流动方向喷射。基于拓扑的三维分离区分析很好地解决了简单几何的问题。本文旨在提供简单的规则和方法,在数学背景的基础上,用清晰的词汇,对复杂的涡轮机械几何进行类似的分析(理解高格曲面)。这种分析依赖于有助于理解复杂几何结构上流动分离机制的物理原理。本文包括许多典型的涡轮机械表面:定子排、无叶扩压器、有叶扩压器、轴向转子以及有冠和无冠离心叶轮。由于曲面同胚性,所提供的一般示例可以很容易地转换为现实形状。此外,经典的涡轮机械问题也被解决,如周期性或转子间隙。在最后一节中,提出的方法是在工业压缩机的径向扩散器上进行的。壁面处的流动从LES计算中提取。研究了不同封闭分离区在高效工况下的分布。
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
CiteScore
2.30
自引率
21.40%
发文量
29
审稿时长
11 weeks
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