Tesla turbine; ORC; Micro expanders; Experimental campaign; Fluid dynamics
Abstract :
[en] The increasing interest in micro power generation is pushing the research world to find new solutions for increasing the efficiency of micro Organic Rankine Cycles. One of their main issues is the efficiency and the reliability of the expander. The Tesla turbine is an old/new expander, which has found a renewed interest in the last years because of the increasing appeal towards distributed micro generation, where this expander becomes competitive. This peculiar technology seems adapted to micro generation in Organic Rankine Cycle thanks to its main characteristic, which is its simple structure that allows for high reliability and cheapness. In recent years, this expander has been analytically and numerically assessed when working with organic fluids. In this study, the experimental investigation of a Tesla turbine working with R1233zd(E) is presented. One of the main achievements was the assessment of the blockage effect of disks edges when the pressure drop through the machine is relevant as in case of Organic Rankine Cycles (e.g. higher than 3–4 bars), resulting into a relatively
large amount of flow deviation through the clearances between the rotor disks package and the case, which implies a throttling effect thus resulting into a relevant performance loss. This effect was accounted by a model that well fitted the experimental data. The achieved results confirmed the validity and the large applications potential of this emerging technology, especially in the fields of micro power generation, low inlet temperature and low expansion ratios. A maximum net power output of 371 W was obtained, proving the feasibility of utilizing Tesla turbines in Organic Rankine Cycle applications. A maximum shaft efficiency of 9.62% and a maximum adiabatic efficiency of 30% were achieved. The results and the developed model of disks edge losses effects represent an important step ahead, in physical depiction of the phenomenology, over the currently available literature, fundamental for the improvement of the design procedure of Tesla turbines for Organic Rankine Cycles.
Disciplines :
Energy
Author, co-author :
Talluri, Lorenzo; Università degli Studi di Firenze - UniFI > Dipartimento di Ingegneria Industriale
Dumont, Olivier ; Université de Liège - ULiège > Département d'aérospatiale et mécanique > Systèmes énergétiques
Manfrida, Giampaolo; Università degli Studi di Firenze - UniFI > Dipartimento di Ingegneria Industriale
Lemort, Vincent ; Université de Liège - ULiège > Département d'aérospatiale et mécanique > Systèmes énergétiques
Fiaschi, Daniele; Università degli Studi di Firenze - UniFI > Dipartimento di Ingegneria Industriale
Language :
English
Title :
Experimental investigation of an Organic Rankine Cycle Tesla turbine working with R1233zd(E)
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