Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Performance Investigation of Bladeless Micro-expanders
Interest in small scale turbines is growing mainly for small scale power generation and energy harvesting applications. Conventional bladed turbines impose manufacturing limitations, lower performance and higher cost, which hinder their implementation at a small scale. Tesla bladeless turbomachines are recently being investigated due to many advantages such as their simple design and ease of manufacturing with acceptable performance. If an efficient design is achieved, this will be a promising machine in the area of small-scale power generation and energy harvesting. However, low (less than 40%) overall experimental isentropic efficiency has been recorded in the literature for Tesla turbines. In this study, firstly, a 0-D model is developed to design the expander rotor. A systematic algorithm is presented, and results of the model are compared with 2-D rotor model results. A 3D computational fluid dynamic (CFD) analysis of rotor and stator with real fluid gas is performed to characterize flow in the Tesla micro expander (all three prototypes studied). The experimental turbine efficiencies were found to be lower compared to the CFD results. The gap in the efficiency is discussed by analyzing CFD and experimental results. A systematic experimental, numerical performance and losses investigation of Tesla turbines for micro-power generation is carried out combining experimental and numerical approaches. In the first prototype, a flexible test rig for the Tesla turbine fed with air is developed of about 100W net mechanical power, with a modular design of two convergent-divergent nozzles to get subsonic as well as supersonic flow at the nozzle exit. Extensive experiments are done by varying design parameters such as disk thickness, the gap between disks, radius ratio and outlet area of exhausts with speeds ranging from 10000 rpm to 40000 rpm. Major losses such as stator and ventilation losses at end disks together with mechanical, leakage and exhaust losses are evaluated experimentally and numerically. The effect of ...
Performance Investigation of Bladeless Micro-expanders
Interest in small scale turbines is growing mainly for small scale power generation and energy harvesting applications. Conventional bladed turbines impose manufacturing limitations, lower performance and higher cost, which hinder their implementation at a small scale. Tesla bladeless turbomachines are recently being investigated due to many advantages such as their simple design and ease of manufacturing with acceptable performance. If an efficient design is achieved, this will be a promising machine in the area of small-scale power generation and energy harvesting. However, low (less than 40%) overall experimental isentropic efficiency has been recorded in the literature for Tesla turbines. In this study, firstly, a 0-D model is developed to design the expander rotor. A systematic algorithm is presented, and results of the model are compared with 2-D rotor model results. A 3D computational fluid dynamic (CFD) analysis of rotor and stator with real fluid gas is performed to characterize flow in the Tesla micro expander (all three prototypes studied). The experimental turbine efficiencies were found to be lower compared to the CFD results. The gap in the efficiency is discussed by analyzing CFD and experimental results. A systematic experimental, numerical performance and losses investigation of Tesla turbines for micro-power generation is carried out combining experimental and numerical approaches. In the first prototype, a flexible test rig for the Tesla turbine fed with air is developed of about 100W net mechanical power, with a modular design of two convergent-divergent nozzles to get subsonic as well as supersonic flow at the nozzle exit. Extensive experiments are done by varying design parameters such as disk thickness, the gap between disks, radius ratio and outlet area of exhausts with speeds ranging from 10000 rpm to 40000 rpm. Major losses such as stator and ventilation losses at end disks together with mechanical, leakage and exhaust losses are evaluated experimentally and numerically. The effect of ...
Performance Investigation of Bladeless Micro-expanders
RENUKE, AVINASH (Autor:in) / Renuke, Avinash / TRAVERSO, ALBERTO / CIANCI, ROBERTO
30.05.2022
doi:10.15167/renuke-avinash_phd2022-05-30
Hochschulschrift
Elektronische Ressource
Englisch
DDC:
690
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