Experimental investigation of the flow inside a water model of a gas turbine combustor: Part 2 - higher order moments and flow visualization

• Tipo: Artigo em Revista Científica Internacional
• Data: 1995

Autores

McGuirk, JJ (Autor) Outra; José Laginha Palma (Autor) FEUP

Revista

Título: Journal of Fluids Engineering, Transactions of the ASME

Vol. 117

Páginas: 459-467

ISSN: 0098-2202

Editora: ASME

Indexação

Scopus - 6 Citações

Outras Informações

ID Authenticus: P-008-P1F

Abstract (EN): The measurements of mean and turbulent quantities presented in Part 1 showed a strong influence of the primary jet system and evidence of the existence of bimodal distributions of the azimuthal velocity was also noted. Due to the importance of this phenomenon for combustor operation, a further study was carried out and measurements of higher order moments (skewness and flatness) were taken, followed by spectral analysis and high-speed flow visualization. These showed that, under the present flow conditions, the time behavior of the six radially impinging primary jets is similar to that encountered in single jet instability studies, with a dominant frequency corresponding to a Strouhal number of 0.27, when correlated with the primary jet characteristics. The unsteady nature of the flow around the primary jets and the high turbulence anisotropies observed suggest that accurate calculations of gas turbine combustor flows are likely to be impossible with models based on time-averaged version of the governing equations, even with closure at the second moment level.

Idioma: Inglês

Tipo (Avaliação Docente): Científica