Numerical prediction of imperfections influence on the film cooling effectiveness
Journal Title: Recueil de mécanique - Year 2016, Vol 1, Issue 2
Abstract
Film cooling is one of the most used techniques for cooling turbine blades. This process is influenced by several geometric and aerodynamic parameters. One such parameter is the geometric shape of the injection holes: their forms and arrangements ... etc. This paper presents the influence of the hole imperfections on the effectiveness of film cooling by means of a computer code ANSYS-CFX. The effect of a jet ejected through a perfect orifice is used as a reference. The effectiveness of film cooling with imperfections in the Injection hole is compared to the perfect case. A toric shape acts as a discrete imperfection. The results are presented as two-dimensional graphs and contours. It is found that an imperfection located at the upstream diameter of the cylinder decreases the effectiveness. Under the same conditions and for the same fixed imperfection near the exit of the cylinder the effectiveness improves. For an injection rate of 1.5, the effectiveness becomes better, than the perfect case. Imperfection placed further from the outlet of the cylinder does not have a significant influence on the cooling effectiveness.
Authors and Affiliations
Azzeddine KHORSI, Mohammed HAMEL
Keywords
Related Articles
- EP ID EP302252
- DOI 10.5281/zenodo.1134937
- Views 53
- Downloads 0
Characterization of organic/inorganic perovskite material CH3NH3PbI3 prepared by spray pyrolysis with moving nozzle method
Methylamine lead tri-iodide (MAPbI3 or CH3NH3PbI3) is a promising organic/inorganic perovskite material in photovoltaic applications. It attracted researcher's attention for its good power conversion efficiency that step...
Numerical investigation of a laminar flow in a tubular chain of a heated floor slab
The present work deals with a numerical study of a laminar flow in a tubular string of a floor slab based on a model of stabilization algorithms that of Gauss and Thomas. The transport equations for the motion amount and...
Nanoindentation applied to the study of biomaterials
A biomaterial is a material used and adapted for medical applications. In order to extend the life of the human body, the biomaterial is the alternative most considered by doctors. Metals used as biomaterials have high y...
Analysis of the influence of angular speed on the wear of a trapezoidal toothed timing belt
Timing belts are essential elements in automobile mechanics. Notched and tensioned, the belt allows the engine components to act synchronously. Its function is mainly to drive the crankshaft and the camshaft, which thems...
Three-dimensional functional tolerancing automated by MT2M and Qualitative Tol
This paper deals with automatic three-dimensional (3D) functional tolerancing. A combination between the Minimum Transfer Modified Method (MT-2M) and qualitative tolerancing method for prismatic parts is developed. The M...