Pressure bifurcation phenomenon on supersonic blowing trailing edges

Martinez-Cava, Alejandro and Wang, Yinzhu and Vicente, Javier de and Valero, Eusebio (2019). Pressure bifurcation phenomenon on supersonic blowing trailing edges. "AIAA Journal", v. 57 (n. 1); pp. 153-164. ISSN 1533-385X. https://doi.org/10.2514/1.J057056.

Description

Title: Pressure bifurcation phenomenon on supersonic blowing trailing edges
Author/s:
  • Martinez-Cava, Alejandro
  • Wang, Yinzhu
  • Vicente, Javier de
  • Valero, Eusebio
Item Type: Article
Título de Revista/Publicación: AIAA Journal
Date: 2019
ISSN: 1533-385X
Volume: 57
Subjects:
Faculty: E.T.S. de Ingeniería Aeronáutica y del Espacio (UPM)
Department: Matemática Aplicada a la Ingeniería Aeroespacial
Creative Commons Licenses: Recognition - Non commercial - Share

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Abstract

Turbine blades operating in transonic–supersonic regime develop a complex shock wave system at the trailing edge: a phenomenon that leads to unfavorable pressure perturbations downstream and can interact with other turbine stages. Understanding the fluid behavior of the area adjacent to the trailing edge is essential in order to determine the parameters that have influence on these pressure fluctuations. Colder flow, bled from the high-pressure compressor, is often purged at the trailing edge to cool the thin blade edges, affecting the flow behavior and modulating the intensity and angle of the shock waves system. However, this purge flow can sometimes generate nonsymmetrical configurations due to a pressure difference that is provoked by the injected flow. In this work, a combination of Reynolds-averaged Navier–Stokes simulations and a global stability analysis is employed to explain the physical reasons of this flow bifurcation. By analyzing the features that naturally appear in the flow and become dominant for some value of the parameters involved in the problem, an antisymmetrical global mode, which is related to the sudden geometrical expansion of the trailing-edge slot, is identified as the main mechanism that forces the changes in the flow topology.

Funding Projects

TypeCodeAcronymLeaderTitle
Horizon 2020675008SSeMIDUNIVERSIDAD POLITECNICA DE MADRIDStability and Sensitivity Methods for Industrial Design

More information

Item ID: 54310
DC Identifier: http://oa.upm.es/54310/
OAI Identifier: oai:oa.upm.es:54310
DOI: 10.2514/1.J057056
Official URL: https://arc.aiaa.org/doi/abs/10.2514/1.J057056
Deposited by: Memoria Investigacion
Deposited on: 03 Apr 2019 11:54
Last Modified: 03 Apr 2019 11:54
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