At the new generations of turbines, the role of cooling systems is going to be more important.They lead to an increase of efficiency through higher process temperatures. In this thesis we look at a combined impingement and effusion cooling system and investigate the influence of several geometrical parameters. Due to the combination of those two cooling systems, an increase of the cooling efficiency should be reached.
This thesis is written at the Institut for Thermodynamics at the university of the Bundeswehr Munich, in cooperation with the chair for thermofluiddynamic at the technical university of Munich. It contains a numerical parameter study using the CFD-simulation tool OpenFOAM. The numerical simulation should support the experimental investigation of a combined impingement/effusion cooling system. At first we build a parametrical mesh. After this, we make the parameter study where we consider a variation of the impingement holes (d = 6/7, 5/9 mm) and the variation of the distance between the impingement and effusion plate (h = 12/20/28mm). For calculations we use the k −ω−SST turbulence model and a first orderdiscretization method.
The parameter study shows the influence of the hole diameter on the pressure loss through the configuration and shows, that the whole change takes place at the impingement plate. Furthermore it shows the stream behavior into the effusion holes as well as the imbalanced velocity and mass flow field inside the effusion holes. Additionally it is given a qualitative view into the stream behavior between the impingement and effusion plate under regard of the vortex structure and dependency of different parameters.
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At the new generations of turbines, the role of cooling systems is going to be more important.They lead to an increase of efficiency through higher process temperatures. In this thesis we look at a combined impingement and effusion cooling system and investigate the influence of several geometrical parameters. Due to the combination of those two cooling systems, an increase of the cooling efficiency should be reached.
This thesis is written at the Institut for Thermodynamics at the university o...
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