Experimental and Computational Investigation of Rayleigh-Bénard Flow in the Rotating Cavities of a Core Compressor
Experimental and Computational Investigation of Rayleigh-Bénard Flow in the Rotating Cavities of a Core Compressor
复制标题
核心压缩机旋转腔中瑞利-贝纳德流动的实验和计算研究
DOI：
10.1115/gt2017-64884
复制
发表时间：
2017
影响因子：
2.6
通讯作者：
C. Long
中科院分区：
文献类型：
--
作者：
M. R. Puttock;Martin George Rose;C. Long
本文介绍了一种新的实验测量，在条件下的航空发动机的代表，从旋转腔的内周面（护罩）的传热。这些结果取自苏塞克斯大学的多腔试验台，该试验台设计成类似于燃气涡轮机高压压缩机内部空气系统。护罩Nusselt数取决于护罩Grashof数，并且对通流轴向雷诺数不敏感。护罩Nusselt数的大小与水平板湍流自由对流的公认相关性一致，但显示出与层流自由对流相似的趋势（Nusselt数到Grashof数的梯度）。
为了研究空腔流场结构，进行了高分辨率的三维非定常RANS模拟，特别关注了近围带区域。这证明了与已发表的工作一致的流动结构，但也表明存在一种Rayleigh-Benard流动，该流动表现为沿着空腔周边传播的一系列条纹。这些结构可以在文献中找到，尽管情况不同。虽然这些条纹已经在模拟中显示出来，但如果没有实验证实，它们的存在就无法得到证实。
This paper presents new experimental measurements, at conditions representative of an aero engine, of heat transfer from the inner peripheral surface (shroud) of a rotating cavity. The results are taken from the University of Sussex Multiple Cavity Rig, which is designed to be similar to a gas turbine high pressure compressor internal air system. The shroud Nusselt numbers are shown to be dependent on the shroud Grashof number and insensitive to throughflow axial Reynolds number. The magnitude of the shroud Nusselt numbers are consistent with accepted correlations for turbulent free convection from a horizontal plate, yet show a trend (gradient of Nusselt to Grashof numbers) that is similar to laminar free convection.
A supporting high-resolution 3D unsteady RANS simulation was conducted to investigate the cavity flow structure with particular attention paid to the near shroud region. This demonstrated flow structures that are consistent with published work but also show the existence of a type of Rayleigh-Benard flow that manifests as a series of streaks that propagate along the periphery of the cavity. These structures can be found in the literature albeit in different circumstances. Whilst these streaks have been shown in the simulation their existence cannot be ratified without experimental confirmation.