Film cooling has dramatically contributed to the performance improvement of gas turbines, as it is a very effective technique for turbines. Large eddy simulation (LES) began be used in study film 20 years ago, and meaningful results have been found, but not yet intensively reviewed. In this review paper, we analyze introduce about 70 papers published on LES over past years. Numerical instabilit...

Abstract: The major effects of cylindrical and row trenched cooling holes with angles alpha=30, beta=0, alpha=40, beta=0 alpha=50, at BR=3.18 on the effectiveness film near combustor end wall surface is an important subject to study in detail. In current study, researchers used a FLUENT package 16/11 simulate 3-D model Pratt Whitney gas turbine engine. this research, RNG turbulence K-ε was anal...

Spray cooling is one of the most promising technologies in applications which require large heat removal capacity in very small areas. Previous experimental studies have suggested that one of the main mechanisms of heat removal in spray cooling is forced convection with strong mixing due to droplet impingement. These mechanisms have not been completely understood mainly due to the large number ...

introduction: the main objective of all organizations is to improve the efficiency and effectiveness of the personnel’s performance and this partly depends on effective management. managers are valuable assets and studying their behavior and personality dimensions may provide important guide for effectiveness and efficiency improvement. in this connection, the objective of this research is to d...

Experimental investigations have been conducted to improve the cooling effectiveness of film-cooling technology. A multiple row cylindrical holes at flat surface was considered by inclining 35° along streamwise direction. low-speed wind tunnel with main flow speed 10 m/s devised create a cross Reynolds number 196,167 and five blowing ratios 0.3, 0.5, 0.7, 1, 2. The proposed triangular-shaped th...