Analysis of streamwise vortices in a supersonic turbine cascade

Autor(es)

Lui, Hugo F. S. ; Wolf, William R. ; Ricciardi, Tulio R. ; Gaitonde, Datta, V

• Tipo de documento: Artigo Científico
• Fonte: AIAA AVIATION FORUM AND ASCEND 2024; v. N/A, p. 10-pg., 2024-01-01.

Resumo

An investigation of streamwise vortices is performed in a supersonic turbine cascade by post-processing wall-resolved large eddy simulation data. For the present flow, the inlet Mach number is M-infinity = 2.0, and the Reynolds number is set as Re = 395, 000. Previous research highlighted the role of near-wall large-scale streaks in driving the separation bubble breathing motion for the current configuration. The present study aims to investigate how streamwise vortices affect the transport of near-wall streaks and, subsequently, the contraction of the separation bubble. For this purpose, Lagrangian coherent structures are extracted from the velocity fields at the leading and trailing edges of the bubble (prior and after the incident shock) by computing the finite-time Lyapunov exponent. As the bubble contracts, there is a noticeable increase in mixing, with the fluid being transported by the streamwise vortices from the high-speed region over the bubble, in the shear layer, towards the wall. This process occurs at specific spanwise locations, resulting in the bubble contraction or even local flow reattachment. (AU)

• Processo FAPESP: 13/08293-7 - CECC - Centro de Engenharia e Ciências Computacionais
• Beneficiário: Munir Salomao Skaf
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• Processo FAPESP: 21/06448-0 - Simulações numéricas de alta fidelidade aplicadas em aerodinâmica não-estacionária, turbulência e aeroacústica
• Beneficiário: William Roberto Wolf
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores - Fase 2
• Processo FAPESP: 19/26196-5 - Simulações de grandes escalas de turbinas axiais supersônicas
• Beneficiário: Hugo Felippe da Silva Lui
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 21/14199-0 - Investigação de interações entre choques e camadas limite em turbinas axiais supersônicas
• Beneficiário: Hugo Felippe da Silva Lui
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado