Large eddy simulation of single and multi-holes of film cooling

علوم کاربردی و محاسباتی در مکانیک

Article 5, Volume 35, Issue 1 - Serial Number 31, March 2023, Pages 71-86   

Document Type: Original Article

DOI: 10.22067/jacsm.2022.78932.1140

Authors

Yaser Taheri¹; Mehran Rajabi Zargarabadi^{* 2}; Mehdi Jahromi³

¹Faculty of Mechanical Engineering, Semnan University, Semnan, Iran

²Faculty of Mechanical Engineering, Semnan University,

³Malek Ashtar University of Technology, Tehran, Iran

Abstract

  In this research, numerical studies have been performed by Reynolds averaged Navier Stokes (RANS) and large eddy simulations (LES) to investigate the effect of a novel film cooling design multi-holes on the film cooling effectiveness over a flat surface. A single cylindrical hole with 11.1 mm diameter and multi-holes (14 holes with a diameter of 2.97 mm) with fan configuration are considered for simulations. Numerical simulations are performed at a fixed density ratio of 1.6, length-to-diameter of 4, an inclined angle of 35^o and blowing ratio 1.25. The results of the present study show that replacing a single hole with multi-holes results in a considerable increase in film cooling effectiveness in both axial and lateral directions, so that leads to an increase of about 94 percent in the area-averaged film cooling effectiveness. In the fan-shaped configuration, the scale of hairpin vortices is smaller than the single cylindrical hole, and forming of the vortices occurs in farther regions downstream of the hole. A pair of anti-jet vortices is formed in the structure of the multi-holes and the rotation direction of these vortices is opposite to the CRVP direction.
 

Keywords

film cooling; multi-holes; large eddy simulation; coherent structures

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