Title: Aerodynamic optimization of a microturbine inserted in a magic-angle spinning system
Authors : Herzog, Nicoleta
Wilhelm, Dirk
Koch, Stefan
Purea, Armin
Osen, David
Knott, Benno
Engelke, Frank
Published in : Journal of Fluids Engineering
Volume(Issue) : 138
Issue : 12
Pages : 121106
Publisher / Ed. Institution : The American Society of Mechanical Engineers
Issue Date: 2016
License (according to publishing contract) : Licence according to publishing contract
Type of review: Peer review (Publication)
Language : English
Subjects : Fluid dynamics; Turbine
Subject (DDC) : 620: Engineering
Abstract: The fluid dynamics of a microturbine system that is applied in a device for chemical and biological analysis—a so-called magic-angle spinning (MAS) probe—is investigated. The drive fluid is pressurized air at ambient temperature provided by nozzles aligned on an intake spiral, driving a Pelton-type microturbine. Computational fluid dynamics (CFD) simulations have been performed and compared with fluid dynamics measurements of the MAS system with 1.3 mm rotor diameter for spinning rates between 23 kHz and 67 kHz. The main optimization criteria of the MAS system are rotor speed and turbine stability and not primarily efficiency, which is standard for turbomachinery applications. In the frame of fabrication tolerances, a sensitivity study has been carried out by varying the nozzles diameter and the nozzle position relative to the rotor. The presented fluid dynamics study of the microturbine system includes the analysis of local fluid flow values such as velocity, temperature, pressure, and Mach number, as well as global quantities like forces and driven torque acting on the turbine. Comparison with the experimental results shows good agreement of the microturbine efficiency. Furthermore, the parameter study of the nozzle diameter reveals optimization potential for this high-speed microturbine system employing a smaller nozzle diameter.
Departement: School of Engineering
Organisational Unit: Institute of Applied Mathematics and Physics (IAMP)
Institute of Energy Systems and Fluid Engineering (IEFE)
Publication type: Article in scientific Journal
ISSN: 1528-901X
0098-2202
URI: https://digitalcollection.zhaw.ch/handle/11475/10585
Published as part of the ZHAW project : Entwicklung eines Ultra-Low-Temperature NMR Probenkopfes für hochgeschwindigkeits Magic-Angle-Spinning Anwendungen mit Hilfe von Computational Fluid Dynamics (CFD) Simulationen
Appears in Collections:Publikationen School of Engineering

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