On Boundary Layer Relaminarization in an Highly Accelerated High Pressure Turbine Stator Flow

Author:

Bader Pascal1,Sanz Wolfgang1

Affiliation:

1. Graz University of Technology, Graz, Austria

Abstract

The boundary layer represents the thin layer between the wall and the free stream. Although this zone is small in respect to the free stream its state — whether it is laminar or turbulent — has a high impact on wall parameters like skin friction but also on the free stream. The state of the boundary layer is influenced by free stream parameters like free stream turbulence intensity or acceleration. Transition can occur from laminar to turbulent, but also from turbulent to laminar. The latter process is called relaminarization. Transition and relaminarization has already been detected in laboratory conditions but also occur in real-life flow around aeroplane wings, but also in turbomachines. In this work a high pressure stator of a two-spool, two-stage turbine is analyzed numerically regarding transition and relaminarization to show how the boundary layer flow along casing and blade is influenced by these phenomena. It is found out in this work, that the boundary layer along the blade, hub and shroud undergoes transition and also relaminarization despite the high free stream velocities and turbulence levels inside the machine. The differences between a transitional and fully turbulent simulation regarding loss generation by wall friction are given.

Publisher

American Society of Mechanical Engineers

Cited by 1 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Numerical simulation of jet impingement relaminarization using nonlinear eddy viscosity turbulence models;Engineering Applications of Computational Fluid Mechanics;2023-01-06

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