Design analysis of Tesla micro-turbine operating on a low-boiling medium

Lampart, Piotr; Kosowski, Krzysztof; Piwowarski, Marian; Jędrzejewski, Łukasz

doi:10.2478/v10012-008-0041-5

Cited by 28 publications

(31 citation statements)

References 3 publications

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“…The 'pressure-based' solver with the sequential solving of the governing equations as well as the SIMPLE algorithm for correction of pressure and velocity is applied. 31,32 So the mesh model of Case 3 is adopted in this article, and the results are independent of the mesh number. Figure 8 shows the change in efficiency based on atmospheric pressure and obtained from numerical simulation and from experiment for varying rotor speed when the inlet pressure is 0.26 MPa.…”

Section: Numerical Simulation and Analysismentioning

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: Numerical Simulation and Analysismentioning

confidence: 99%

Experimental study on bladeless turbine using incompressible working medium

Wang

Yao

et al. 2017

Advances in Mechanical Engineering

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“…[35] Experiments were carried out to investigate how the inlet pressure affects the rotation speed and the output performance of the TENG. [35] Experiments were carried out to investigate how the inlet pressure affects the rotation speed and the output performance of the TENG.…”

Section: Basic Structure and Working Mechanism Of Bt-tengmentioning

confidence: 99%

Bladeless‐Turbine‐Based Triboelectric Nanogenerator for Fluid Energy Harvesting and Self‐Powered Fluid Gauge

Chen

Tang

Han

et al. 2018

Adv Materials Technologies

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triboelectrification and electrostatic induction. [2][3][4] It can convert ambient mechanical energy from various sources, such as wind, [5] human body motion, [6] and ocean wave, [7,8] into useful electrical energy. The TENG shows a great potential as self-powered active sensors with applications including wearable electronics, [9,10] infrastructure monitoring, [11] and medical science. [12] There are also the advantages of cost-effective, simple fabrication, and high efficiency.The critical challenge for the practical applications of TENG is relatively low output power, which is determined by the surface charge density and the working frequency. Several methods have been developed to increase the charge density on the dielectric surface, such as corona charging and charge pump. [13][14][15][16][17] However, the surface charge density is limited to a relatively low value because of air breakdown. [18] On the other hand, increasing the working frequency of the TENG is found to be a feasible method for improving the current. [19][20][21][22] As a typical structure, the rotational disk-based TENG has been widely studied. Owing to the nonintermittent and ultrafast rotation-induced charge transfer, it achieves a very high sinusoidal current output performance. Driven by powerful electromotors and complicated gear system, the rotation speed of the TENG reaches several hundred rpm and even 1000 rpm. But it is hard to increase the frequency further, because of the structure and the material strength. [23,24] However, the bladeless turbine is reported to have advantages of very high rotation speed, simple fabrication, easy maintain, as well as wide selection of materials. [25][26][27][28] Here, we combine a bladeless turbine with triboelectric nanogenerator (BT-TENG), which transforms the fluid flow into rotation motion and generates electrical output. It can achieve high rotation speed without electromotors. When blown by compressed air at pressure of 48 kPa, the BT-TENG rotated at ≈7500 rpm, which is about eight times faster than those reported in previous literature. [29,30] Thanks to its high-frequency rotation, the short-circuit current reached 63 µA, and the output power was 3.6 mW. Due to the planar structure of both the turbine and TENG, it is very easy to integrate multiple layer TENG on the whole system. When six TENGs were integrated with the bladeless turbine coaxially, the total short-circuit current was up to 180 µA and the output power increased to 15 mW, which is Triboelectric nanogenerator (TENG) is attractive as an energy harvesting and self-powered sensing technology. The working frequency and surface charge density are the key factors that influence the output performance. To boosting the output of the TENG by improving the working frequency, a bladeless turbine-based triboelectric nanogenerator (BT-TENG) is designed, which transforms the fluid flow into a high rotation motion that drives the rotation TENG. When blown by compressed air, the BT-TENG rotates at an average speed of 7500 rpm. Owing to its...

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“…O princípio Tesla possui diversas aplicações e em vários casos: turbinas a vapor (RAJE et al, 2015, p. 30 e 31), casos em que o fluido de trabalho contém particulados (como sal e água contaminada) (RAJE et al, 2015, p. 30 e 31), casos com fluidos de baixa e alta viscosidades (RAJE et al, 2015, p. 30 e 31), DAVs (Dispositivos de Assistência Ventricular) (YU, 2015, p. 4), cogeração em micro-plantas de geração de energia (LAMPART et al, 2009), sistemas pico-hidráulicos para eletrificação rural (HO-YAN, 2011) etc.…”

Section: Introductionunclassified

Projeto, Fabricação e Caracterização de uma Bomba Tesla

Alonso

2018

Mecatrone

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Resumo -Dispositivos Tesla são compostos de discos rotativos (sem palhetas) que funcionam por efeito da camada limite (i.e., por forças de atrito viscoso atuando no fluido e efeito Coandă). Segundo esse princípio de funcionamento, o fluxo resulta contínuo e não pulsátil. O objetivo deste projeto é projetar, fabricar e caracterizar uma bomba Tesla visando melhorar eficiência e potência. A bomba Tesla tem várias aplicações, porém a eficiência de seu funcionamento é consideravelmente baixa, o que abre espaço para otimização do seu projeto. Este projeto é realizado por meio de otimização do rotor e da voluta da bomba Tesla para operação com um fluido newtoniano em escoamento laminar. O funcionamento da bomba Tesla é simulado usando o Método de Elementos Finitos na plataforma FEniCS e validado com o software ANSYS R CFX. A otimização topológica é implementada na plataforma FEniCS utilizando-se a biblioteca dolfin-adjoint no cálculo de sensibilidades (derivadas) e o algoritmo IPOPT para otimização. São fabricados e caracterizados experimentalmente dois protótipos: um protótipo de bomba Tesla usando CDs (discos de policarbonato usados para armazenamento digital de dados) como os discos do rotor, com o espaçamento otimizado por análise paramétrica; e um protótipo projetado pelo método de otimização topológica (fabricado por meio de manufatura aditiva). Palavras-chave -Bombas centrífugas; Dinâmica dos fluidos (Simulação); Método dos elementos finitos; Métodos topológicos (Otimização).Versão inicial submetida em 02 de Fev. de 2018. Versão final aceita em 26 de Jun. de 2018. Publicado em 01 de Dez. de 2018.Abstract -Tesla devices consist of rotating disks (without blades), whose operation is based on the boundary layer effect (i.e., viscous friction forces acting on the fluid and Coandă effect). According to this working principle, the flow becomes continuous and nonpulsatile. The objective of this project is to design, fabricate and characterize a Tesla pump aiming to improve its efficiency and power. The Tesla pump has various applications, but the efficiency of its operation is quite low, which makes room for the optimization of its design. This project is based on the optimization of the rotor and the volute of a Tesla pump operating with a newtonian fluid in laminar flow. The operation of the Tesla pump is simulated by using the Finite Element Method in the FEniCS platform and validated with the software ANSYS R CFX. The topology optimization is implemented in the FEniCS platform by using the dolfin-adjoint library for sensitivity (derivative) calculation and the IPOPT algorithm for optimization. Two prototypes are fabricated and characterized experimentally, consisting of a Tesla pump composed of CDs (polycarbonate discs used as digital data storage) as the rotor disks; and a prototype designed by the topology optimization method (fabricated by additive manufacturing).

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Design analysis of Tesla micro-turbine operating on a low-boiling medium

Cited by 28 publications

References 3 publications

Experimental study on bladeless turbine using incompressible working medium

Experimental study on bladeless turbine using incompressible working medium

Bladeless‐Turbine‐Based Triboelectric Nanogenerator for Fluid Energy Harvesting and Self‐Powered Fluid Gauge

Projeto, Fabricação e Caracterização de uma Bomba Tesla

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