Characterisation of a small viscous flow turbine

Lemma, Engida; Deam, Rowan; Toncich, Dario J.; Collins, R

doi:10.1016/j.expthermflusci.2008.07.009

Cited by 48 publications

(60 citation statements)

References 35 publications

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“…Lawn and Rice 13 reported that the theoretical highest efficiency of the disk rotor can reach 81%, which is close to the 80% predicted by Allen. Lemma et al 14 and Deam et al 15 conducted theoretical and experimental research on a bladeless turbine with a disk diameter of 0.05 m and a gaseous working medium. They found that its experimental efficiency was 18%-25%.…”

Section: Previous Work On Bladeless Turbinementioning

confidence: 99%

Experimental study on bladeless turbine using incompressible working medium

Wang

Yao

et al. 2017

Advances in Mechanical Engineering

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The bladeless turbine has a promising future as a new power generation system. To explore the operating characteristics of the turbine, a bladeless turbine experimental platform with an incompressible working medium was designed and built. The relationships among performance parameters were analysed in experiments, and studies were conducted on the flow characteristics of the working medium inside the turbine using numerical simulation software. The causes of entry and exit losses were analysed. The data acquired by simulation were consistent with the result of calculations using the partial loss model developed in this article, which means that this model is capable of calculating the partial loss of a bladeless turbine and is thus suitable for the design and optimization of bladeless turbines.

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Section: Previous Work On Bladeless Turbinementioning

confidence: 99%

Experimental study on bladeless turbine using incompressible working medium

Wang

Yao

et al. 2017

Advances in Mechanical Engineering

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“…We have assumedr o = 0.528 and α = 6.2 • (i.e., 0.11 radian), the values adopted in the experimental study of Ref. 32. Sample computations were also repeated at other values ofr o and α, but it was found that they do not reveal any new physics; hence, they are not reported here.…”

Section: Resultsmentioning

confidence: 99%

The physics of pressure variation in microchannels within corotating or static discs

Guha

Sengupta

2016

Physics of Fluids

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“…According to the public literature, nozzles or a volute can be adopted as the stator of Tesla turbines, thus they can be divided into nozzled Tesla turbines and voluted Tesla turbines. Among all investigations on Tesla turbines, only a few are on the voluted Tesla turbines, which were studied experimentally and numerically to analyze their performance characteristics by Lemma et al [9]. The results show that the turbine efficiency in the experiment is about 25%, and the low efficiency is due to several kinds of losses, such as bearing losses and end wall losses.…”

Section: Introductionmentioning

confidence: 99%

Influence of Disc Tip Geometry on the Aerodynamic Performance and Flow Characteristics of Multichannel Tesla Turbines

Deng

Chi

et al. 2019

Energies

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As a competitive small-scale turbomachinery option, Tesla turbines have wide potential in various fields, such as renewable energy generation systems and small power equipment. This paper investigates the influence of disc tip geometry, including its profile and relative height, on the aerodynamic performance and flow characteristics of one-to-one and one-to-many multichannel Tesla turbines. The results indicate that compared to the turbine with blunt tips, the isentropic efficiency of the one-to-one turbine with sharp tips has a little decrease, which is because the relative tangential velocity gradient near the rotational disc walls decreases a little and additional vortices are generated at the rotor inlet, while that of the one-to-many turbine with sharp tips increases significantly, resulting from an increase in the relative tangential velocity in the disc channels and a decrease in the low Mach number and vortex area; for instance the turbine efficiency for the former relatively decreases by 3.6% and that for the latter increases by 13.5% at 30,000 r/min. In addition, the isentropic efficiency of the one-to-many turbine with sharp tips goes up with increasing relative height due to increasing improvement of flow status, and its increment rate slows down. A circular or elliptic tip performs better with lower relative height and a triangular tip behaves better with higher relative height. To sum up, a blunt disc tip is recommended for the one-to-one turbine, and a sharp disc tip is for the one-to-many turbine. The relative height and tip profile of the one-to-many turbine should be determined according to their effects on turbine performance, manufacturing difficulty and mechanical deformation.

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Characterisation of a small viscous flow turbine

Cited by 48 publications

References 35 publications

Experimental study on bladeless turbine using incompressible working medium

Experimental study on bladeless turbine using incompressible working medium

The physics of pressure variation in microchannels within corotating or static discs

Influence of Disc Tip Geometry on the Aerodynamic Performance and Flow Characteristics of Multichannel Tesla Turbines

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