NDLI: Cavitation Modelling in Different Designs of Micro Kaplan Hydro-Turbine

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Cavitation Modelling in Different Designs of Micro Kaplan Hydro-Turbine

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Elgammal, Tarek Sakamoto, Tomoki Ryoichi, S. Amano
Copyright Year	2018
Abstract	The paper investigates the cavitation in micro-turbomachinery, using a small-sized water system. Unsteady numerical model is architected to predict cavitating flows through a 7.5 cm axial hydro-turbine working at 2.8 m water head. Based on the validated simulations, specific turbine designs (regular design and rim-drive turbines) are simulated with cavitating flow conditions including different rotation speeds (1000–5000 rpm) and outlet pressures (0, -24, -48, -96, kPa gage). Phase change interactions (liquid water and vapor) were considered by adding the physics models of Volume of Fluid (VOF) multiphase, cavitation, and Large Eddy Simulation (LES) turbulence. Records featured spatial variation in the cavitation pattern between the two designs. Rim-drive turbine stands against cavitation along the rim integration lines, but it starts the hub cavitation earlier than the regular turbine. The proposed rim-drive bests the regular geometry before cavitation, and the relative efficiency gap increased to be 16% at extreme cavitation condition.
Sponsorship	Power Division Advanced Energy Systems Division Solar Energy Division Nuclear Engineering Division
File Format	PDF
ISBN	9780791851395
DOI	10.1115/POWER2018-7109
Volume Number	Volume 1: Fuels, Combustion, and Material Handling; Combustion Turbines Combined Cycles; Boilers and Heat Recovery Steam Generators; Virtual Plant and Cyber-Physical Systems; Plant Development and Construction; Renewable Energy Systems
Conference Proceedings	ASME 2018 Power Conference collocated with the ASME 2018 12th International Conference on Energy Sustainability and the ASME 2018 Nuclear Forum
Language	English
Publisher Date	2018-06-24
Publisher Place	Lake Buena Vista, Florida, USA
Access Restriction	Subscribed
Subject Keyword	Water Turbulence Computer simulation Vapors Turbomachinery Cavitation Modeling Flow (dynamics) Gages Rotation Physics Design Geometry Hydraulic turbines Fluids Large eddy simulation Simulation Engineering simulation Turbines
Content Type	Text
Resource Type	Article

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