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
Study of the pressure distribution during the optical glass polishing
The reproduction of very high quality surfaces during the optical glass polishing is the mannered main objective. To come closer this objective, it is necessary to take in consideration all polishing parameters while mor...
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...
Presentation of a three-dimensional metrology software
This paper presents a three-dimensional metrology software,named « GFDSoft » Geometrical Form Defect Software, developed by MOULAI-KHATIR. GFDSoft implements the least squares adjustment criterion (which is the most comm...
Thermal regulation of photovoltaic’s cells with a phase change material
Elevation temperature of photovoltaic’s (PV) cells reduced his efficiency, but the use of phase change material’s (PCM) behind the PV can maintain his temperature close of the ambient. This paper studies the use of PCM o...
Comparative study between two three-dimensional metrology software
This article presents a comparative study between two three-dimensional metrology software, the Metrosoft software of the "Metromec" machine of the National Polytechnic School of Oran and the Geoverif experimental softwa...