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Numerical prediction of film cooling of turbine blades using multiblock curvilinear grids

University of British Columbia

In the present thesis, a computational capability is developed for the prediction of film cooling of turbine blades. This includes the development of two comprehensive numerical codes and the associated methods. To address the difficulties associated with complex configurations of turbine blades and convergence problems, several numerical techniques are used, including curvilinear coordinate-based calculations, multigrid acceleration, do main segmentation and grid generation. Investigation and validation of these methods are carried out and novel techniques are proposed to achieve an efficient numerical solver. Two computer codes have been developed. One is a 3D curvilinear coordinate-based CFD code, called CMGFD, which can be used to calculate laminar/turbulent flows in arbitrary geometries using non-structured curvilinear grids. The methods developed here have been implemented into the codes. To support the application of the CMGFD code, a multigrid elliptic grid generation code, MBEGG, was developed which can be used to generate multi-block curvilinear grids for the CMGFD code. A multigrid method is used to solve the three elliptic grid generation equations thus providing an efficient grid generator. The developed computational codes are applied to study film cooling of an experimental turbine blade model. The computational domain follows the physical geometry which includes a curved blade surface and a number of injection holes. A block structured curvilinear grid is generated by the MBEGG code which exactly represents the inclined, round film-holes and the curved blade surface. The computational results show that the developed numerical tool has the potential to accurately model the complex cooling process in actual blade geometries.

Thesis/Dissertation

application/pdf

2009-04-15

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http://hdl.handle.net/2429/7146

Mathematics

University of British Columbia

UBCV

DSpace