Raharjo, R. Firson Joko; (2003) Two-dimensional inverse design and optimisation of turbomachinery blades. Masters thesis (M.Phil), UCL (University College London).

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Abstract

The two-dimensional multiblock unsteady Euler and Navier-Stokes solver for turbomachinery blades has been developed. These flow solvers were used to analyse and design the turbomachinery blades using inverse and optimisation method. The inverse method employs the Euler solver base on cell-vertex scheme in conjunction with artificial viscosity and Runge-Kutta integrator. Further development of this solver led to the Navier-Stokes solver with the Baldwin-Lomax turbulence model and the Abu-Ghannam and Shaw transition model. The viscous code was applied for designing more complicated design parameter such as heat transfer coefficient distribution using optimisation method. Both flow solvers were first validated by using experimental measurements. Additionally, the result from commercial software Fluent was also used for validation of the viscous flow solver. In the inverse method, the blade is modified until the obtained mass-averaged tangential velocity is close enough to the specified one. The blade is updated for each iteration using the blade modification algorithm, which derived from the slip condition on the wall and fixed thickness distribution. The inverse method was validated numerically by reproducing a VKI turbine rotor blade in the upper transonic flow. Two examples of inverse method are shown with specific thickness distributions. While, in the optimisation method the blade is generated for each iteration using the developed subroutine NURBS, which generates camber line and thickness distribution by control points. This subroutine and the viscous flow solver are employed in the framework of iSight to run and analyse the optimisation process. The validation and two examples of optimisation method on the pressure loading and on the heat transfer coefficient are presented.

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