Large Eddy Simulation of Film Cooling Involving Compound Angle Hole with Bulk Flow Pulsation

The effects of pulsations in the main flow on film cooling from a cylindrical hole with a spanwise injection angle (orientation angle) are analyzed using numerical methods. The hole is located on a flat plate with a 35° inclined injection angle, and the compound angle denotes the orientation and inc...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Seung-Il Baek, Joon Ahn
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	large eddy simulation Reynolds-averaged Navier–Stokes simulation gas turbine cooling film cooling Technology T
Acceso en línea:	https://doaj.org/article/5dabc969e8bb4d3aa5d9c32f53070789
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:5dabc969e8bb4d3aa5d9c32f53070789
record_format	dspace
spelling	oai:doaj.org-article:5dabc969e8bb4d3aa5d9c32f530707892021-11-25T17:27:41ZLarge Eddy Simulation of Film Cooling Involving Compound Angle Hole with Bulk Flow Pulsation10.3390/en142276591996-1073https://doaj.org/article/5dabc969e8bb4d3aa5d9c32f530707892021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/22/7659https://doaj.org/toc/1996-1073The effects of pulsations in the main flow on film cooling from a cylindrical hole with a spanwise injection angle (orientation angle) are analyzed using numerical methods. The hole is located on a flat plate with a 35° inclined injection angle, and the compound angle denotes the orientation and inclination angles. The film cooling flow fields for the sinusoidal flow pulsation of 36 Hz from a cylindrical hole with 0° and 30° orientation angles at the time-averaged blowing ratio of <i>M</i> = 0.5 are simulated via large eddy simulation (LES). The CFD results are validated using the experimental data and compared to the Reynolds-averaged Navier–Stokes (RANS) and URANS results. The results reveal that if the pulsation frequency goes from 0 to 36 Hz, the adiabatic film cooling effectiveness decreases regardless of the compound angle; however, the film cooling for the 30° orientation angle exhibits better performance than that for a simple angle (0°). Moreover, if 36 Hz pulsation is applied, the film cooling effectiveness obtained by unsteady RANS exhibits a large deviation from the experimental data, unlike the LES results. The credibility of the LES results relative to the experimental data is demonstrated by comparing the time-averaged <i>η</i> and the phase-averaged temperature contours. The LES results demonstrate that LES can more accurately predict <i>η</i> than the experimental data; in contrast, URANS results are highly overpredicted around the centerline of the coolant spreading. Thus, LES results are more consistent with the experimental results for the time- and phase-averaged temperature contours than the URANS results.Seung-Il BaekJoon AhnMDPI AGarticlelarge eddy simulationReynolds-averaged Navier–Stokes simulationgas turbine coolingfilm coolingTechnologyTENEnergies, Vol 14, Iss 7659, p 7659 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	large eddy simulation Reynolds-averaged Navier–Stokes simulation gas turbine cooling film cooling Technology T
spellingShingle	large eddy simulation Reynolds-averaged Navier–Stokes simulation gas turbine cooling film cooling Technology T Seung-Il Baek Joon Ahn Large Eddy Simulation of Film Cooling Involving Compound Angle Hole with Bulk Flow Pulsation
description	The effects of pulsations in the main flow on film cooling from a cylindrical hole with a spanwise injection angle (orientation angle) are analyzed using numerical methods. The hole is located on a flat plate with a 35° inclined injection angle, and the compound angle denotes the orientation and inclination angles. The film cooling flow fields for the sinusoidal flow pulsation of 36 Hz from a cylindrical hole with 0° and 30° orientation angles at the time-averaged blowing ratio of <i>M</i> = 0.5 are simulated via large eddy simulation (LES). The CFD results are validated using the experimental data and compared to the Reynolds-averaged Navier–Stokes (RANS) and URANS results. The results reveal that if the pulsation frequency goes from 0 to 36 Hz, the adiabatic film cooling effectiveness decreases regardless of the compound angle; however, the film cooling for the 30° orientation angle exhibits better performance than that for a simple angle (0°). Moreover, if 36 Hz pulsation is applied, the film cooling effectiveness obtained by unsteady RANS exhibits a large deviation from the experimental data, unlike the LES results. The credibility of the LES results relative to the experimental data is demonstrated by comparing the time-averaged <i>η</i> and the phase-averaged temperature contours. The LES results demonstrate that LES can more accurately predict <i>η</i> than the experimental data; in contrast, URANS results are highly overpredicted around the centerline of the coolant spreading. Thus, LES results are more consistent with the experimental results for the time- and phase-averaged temperature contours than the URANS results.
format	article
author	Seung-Il Baek Joon Ahn
author_facet	Seung-Il Baek Joon Ahn
author_sort	Seung-Il Baek
title	Large Eddy Simulation of Film Cooling Involving Compound Angle Hole with Bulk Flow Pulsation
title_short	Large Eddy Simulation of Film Cooling Involving Compound Angle Hole with Bulk Flow Pulsation
title_full	Large Eddy Simulation of Film Cooling Involving Compound Angle Hole with Bulk Flow Pulsation
title_fullStr	Large Eddy Simulation of Film Cooling Involving Compound Angle Hole with Bulk Flow Pulsation
title_full_unstemmed	Large Eddy Simulation of Film Cooling Involving Compound Angle Hole with Bulk Flow Pulsation
title_sort	large eddy simulation of film cooling involving compound angle hole with bulk flow pulsation
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/5dabc969e8bb4d3aa5d9c32f53070789
work_keys_str_mv	AT seungilbaek largeeddysimulationoffilmcoolinginvolvingcompoundangleholewithbulkflowpulsation AT joonahn largeeddysimulationoffilmcoolinginvolvingcompoundangleholewithbulkflowpulsation
_version_	1718412352475365376

Large Eddy Simulation of Film Cooling Involving Compound Angle Hole with Bulk Flow Pulsation

Ejemplares similares