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
Modeling the radiate and energy balance of a building located in the Adrar region
In this paper, we study the effect of temperature and external solar flow on the evolution of daily solar radiation incidental on the walls of a building located in the ADARAR region of Algeria. The numerical simulations...
DTC-RNA control with 36 sectors of induction motor by PI-fuzzy speed regulator
Direct Torque Control (DTC) is the direct control of the electromagnetic torque of the machine. This article presents a 36-sectors DTC command of an induction machine based on intelligent controllers. A classical PI cont...
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...
Theoretical and experimental investigation of on glass solar still
This paper presents a theoretical and experimental work performed on a glass solar still. The solar distiller under study was fabricated with cheap glass and the polyethylene as absorber, and was tested under the climati...
Numerical prediction of imperfections influence on the film cooling effectiveness
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: th...