A FAST LAGRANGIAN SIMULATION METHOD FOR FLOW ANALYSIS AND RUNNER DESIGN IN PELTON TURBINES

In the present work, an alternative numerical methodology is developed for a fast and effective simulation and analysis of the complex flow and energy conversion in Pelton impulse hydro turbines. The algorithm is based on the Lagrangian approach and the unsteady free-surface flow during the jet-buck...

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Bibliographic Details
Published in:Journal of hydrodynamics. Series B 2012-12, Vol.24 (6), p.930-941
Main Authors: ANAGNOSTOPOULOS, John S., PAPANTONIS, Dimitris E.
Format: Article
Language:English
Subjects:
bucket shape parameterization
Buckets
Computational fluid dynamics
Computer simulation
Engineering
Engineering Fluid Dynamics
Fluid flow
hydraulic efficiency
Hydraulics
Hydrology/Water Resources
Lagrangian simulation
Mathematical models
Numerical and Computational Physics
numerical design optimization
Parametrization
Pelton turbine
Simulation
Turbines
拉格朗日方法
数值模拟方法
模型应用
水斗式水轮机
流道设计
流量分析
自由表面流
进化算法
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Summary:In the present work, an alternative numerical methodology is developed for a fast and effective simulation and analysis of the complex flow and energy conversion in Pelton impulse hydro turbines. The algorithm is based on the Lagrangian approach and the unsteady free-surface flow during the jet-bucket interaction is simulated by tracking the trajectories of representative fluid particles at very low computer cost. Modern regression tools are implemented in a new parameterization technique of the inner bucket surface. Key-feature of the model is the introduction of additional terms into the particle motion equations to account for various hydraulic losses and the flow spreading, which are regulated and evaluated with the aid of experimental data in a Laboratory Pelton turbine. The model is applied to study the jet-runner interaction in various operation conditions and then to perform numerical design optimization of the bucket shape, using a stochastic optimizer based on evolutionary algorithms. The obtained optimum runner attains remarkably higher hydraulic efficiency in the entire load range. Finally, a new small Pelton turbine (150 kW) is designed, manufactured and tested in the Laboratory, and its performance and efficiency verify the model predictions.
ISSN:1001-6058
1878-0342
DOI:10.1016/S1001-6058(11)60321-1