Axial Bladeless Turbine Suitable for High Supersonic Flows

Vinha, Nuno; Paniagua, Guillermo; Sousa, Jorge; Saracoglu, Bayindir H.

doi:10.2514/1.b35818

Cited by 10 publications

(6 citation statements)

References 7 publications

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“…Lampart and Jędrzejewski 18 studied the entry nozzle of a bladeless turbine using gas as the working medium and they obtained optimal parameters for the turbine with the maximum efficiency. Vinha et al 19 employed a compressible flows with three-dimensional (3D) Reynolds-Averaged Navier-Stokes (RANS) simulations for high-speed applications where the optimum revolutions per minute (RPM) for efficiency is discussed with velocity triangles and where a similar quadratic trend is seen.…”

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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“…Figure 1(a) depicts the bladeless turbine with a flat design with a working operation as detailed in Ref. [11] in which a swirl angle is crucial for power generation from the viscous forces acting on the hub. Figure 1(b) shows a bladeless turbine with a wavy surface.…”

Section: The Wavy Bladeless Turbinementioning

confidence: 99%

“…A third class of fluid machine is the bladeless turbine. Vinha et al [11] proposed an axial bladeless turbine (MBDA patent EP 2868864 [12]) operating in the steady supersonic flow regime (flows with Mach number around 3.5 and an inlet relative swirl angle of 16 deg). In this type of smooth/flat axial turbine, the power is extracted by only using the viscous forces.…”

Section: Introductionmentioning

confidence: 99%

“…In this type of smooth/flat axial turbine, the power is extracted by only using the viscous forces. Additionally, a preswirler or nozzle guide vanes are needed to generate power (absolute inlet flow angle of 30 deg [11]). The power extraction was explained by means of velocity triangles and the effect of the viscous forces were studied via steady Reynolds averaged Navier-Stokes (RANS) simulations.…”

Section: Introductionmentioning

confidence: 99%

“…Schmidt reported the use of radial bladeless turbines for power production from biomass combustion and achieved efficiencies from 11% to 13% [16]. For an axial turbine, a power extraction up to 0.4 MW was achieved for a bladeless turbine with a length of 0.7 m and with a hub radius of 0.345 m and an inlet flow angle of 30 deg [11]. Braun et al [17] studied the influence of wavy axial bladeless turbines for unsteady moving shocks for one single operational point and found a significant effect of the pressure forces acting on the hub.…”

Section: Introductionmentioning

confidence: 99%

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Design and Experimental Assessment of Bladeless Turbines for Axial Inlet Supersonic Flows

Braun

Paniagua

Falempin

et al. 2020

Journal of Engineering for Gas Turbines and Power

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Supersonic inlet flow is usually considered to be detrimental to the performance of turbine systems. A new class of bladeless turbines was developed, which allows for power extraction from supersonic axial inflows without swirl with minimal maintenance cost. This is achieved through a wavy hub surface that promotes shocks and expansion fans and hence generates torque. In a first step, a baseline bladeless turbine is designed and the power extraction is analyzed. The bladeless turbine surface is parametrized in matlab and subsequently imported into Hexpress (Numeca) to mesh an unstructured grid. The first layer thickness is kept below one for all the simulations. The unstructured mesh is loaded into cfd++ (Metacomp) to solve the three dimensional steady Reynolds-averaged Navier–Stokes (RANS) equations. Second, the work extraction principle is broken down from a three-dimensional unsteady problem into a two-dimensional steady phenomenon. An experimental campaign is outlined and test details are discussed. Finally, after the experimental characterization, the operational envelope and scaling of the bladeless turbine are described for several reduced mass flows, reduced speeds, and geometrical features of the turbine (amplitude of the wavy surface, helix angle, hub radius, and length of the axial turbine).

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A Review of Supersonic Turbines Based on Constant Volume Combustion Cycle

Wen

2021

Lecture Notes in Electrical Engineering

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Axial Bladeless Turbine Suitable for High Supersonic Flows

Cited by 10 publications

References 7 publications

Experimental study on bladeless turbine using incompressible working medium

Experimental study on bladeless turbine using incompressible working medium

Design and Experimental Assessment of Bladeless Turbines for Axial Inlet Supersonic Flows

A Review of Supersonic Turbines Based on Constant Volume Combustion Cycle

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