Quasi 3-D Inverse Design Method, Optimization Criterion for Very Low Head Axial Turbine Design
The 3-D shape of turbo-machines, their design is a delicate and difficult task. Small changes in geometrical details can lead to large changes in performance, like resulting head, efficiency and cavitation characteristics. In turbo-machine manufactures are often designed based on combination of experience of the designer and direct Computational Fluid Dynamic (CFD) analysis of the flow inside the machine. The goal of this study is to develop Quasi 3-D Inverse method or design problem has been developed which can assist the designer in realizing better design. In particular the developed methods can be applied to the design Very Low Head Turbine for which the flow is assumed to be incompressible. The core flow is considered to be inviscid and the viscosity effects are assumed to be restricted to relatively thin boundary layers. The paper briefly explains the quasi 3-D design and analysis. Both guide vanes and runner blades are designed using quasi 3-D inverse method. For a direct method, the geometry of the guide vane and the runner is used as input and the flow filed and the performance are obtained as a result. In contrast, for an inverse method the performance is prescribed, via loading function and both the flow field and the blade curvature distribution obtained as a result of the inverse or design analysis. Since the inverse design method introduces an additional unknowns are the blade curvature and additional boundary condition is needed to solve the inverse or design problem. The method has been verified and applied to the design of two quasi 3-D of free vortex and mixed vortex of guide vane and runner. The inverse or design problem is improved the inception of the cavitation. This is the result of the prescribed zero incidence at leading edge of blades of guide vane and runner.
Inverse method design method Quasi 3-D Very Low Head Turbine
Priyono Sutikno I Nengah Diasta
Laboratory of Fluid Machinery. Faculty of Mechanical and Aerospace Engineering ITB
国际会议
The 7th International Conference on Fluid and Thermal Energy Conversion(第七届流动技术与热能转化国际会议 FTEC 2011)
郑州
英文
390-401
2011-09-24（万方平台首次上网日期，不代表论文的发表时间）