Experimental and numerical analyses to enhance the performance of a microturbine diffuser

Benini, Ernesto; Toffolo, Andrea; Lazzaretto, Andrea

doi:10.1016/j.expthermflusci.2005.09.003

Cited by 14 publications

(3 citation statements)

References 20 publications

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“…Many researchers have conducted exhaustive research regarding the subject [3][4]. Professor Huang, College of Oral Medicine from Taipei Medical University, investigates the luminance and the brightness field distribution of the micro structures of a light guiding plate (LGP) by micro injection molding (MIM) and micro injection-compression molding (MICM) [5].…”

Section: Introductionmentioning

confidence: 99%

Effect of Micro Structures of Diffusers on Optical Properties of LED Light

Zhou

Zheng

et al. 2012

KEM

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The diffusers with microlens arrays and V-cut micro structures of LED light were designed in this paper. Based on the theory of non-linear ray tracing, optical properties of the diffusers with three different micro structures were simulated by Lighttools. The three different structures are diffuser with non-structures, diffuser with 0.4mm in diameter microlens arrays and diffuser with V-cut which groove width is 0.4mm and the material of the diffusers was PP (polypropylene). Three types of diffusers were fabricated by extrusion rolling method and their transmittance and uniformity were tested. The simulation showed that diffuser with V-cut micro structures had the best transmittance and uniformity. The experiment showed that the diffusers produced by extrusion rolling method had perfect reprint effect. The simulation results and experiment results had much consistency in transmittance and uniformity. This research is helpful to solve the non-uniform luminescence and glare problems of the LED light.

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Section: Introductionmentioning

confidence: 99%

Effect of Micro Structures of Diffusers on Optical Properties of LED Light

Zhou

Zheng

et al. 2012

KEM

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“…Zhang et al 12 used digital particle image velocimetry (DPIV) to measure the flow angle at the impeller exit and in the VLS. Benini et al 13 used experimentation and numerical calculation to enhance the performance of the vaned diffuser. Kim et al 14 discussed the effect of changing the vaned diffuser geometry on the compressor performance.…”

Section: Introductionmentioning

confidence: 99%

A study of off-design performance improvement for a centrifugal refrigerant compressor

Hung

Chung

Liu

et al. 2017

Advances in Mechanical Engineering

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This study numerically investigates the effects of changing vaned diffuser angles and vaneless diffuser widths of a twostage centrifugal refrigerant compressor on the reduction of surge flow rate and the improvement of part-load performance. The first stage has a low-solidity vaned diffuser, while the second stage has a vaneless diffuser. The analysis results show that adjusting the angle of low-solidity vaned diffuser in the first stage can lower the surge flow rate and keeps high efficiencies at low flow rates. The inlet guide vane of the first stage can also lower the surge flow rate; however, their simultaneous actuation cannot lower the surge flow rate further. Reducing the vaneless diffuser width of the second stage can lower the surge flow rate. Meanwhile, simultaneously adjusting the individual inlet guide vanes of the second stage can also effectively lower the surge flow rate. If the diffuser width of the first stage is reduced while the low-solidity vaned diffuser blade angle is fixed, the surge flow rate will be lowered obviously as the inlet guide vane is adjusted. However, reduction in diffuser width decreases the efficiency at low flow rate. Controlling the inlet guide vane and diffuser width well can lower the surge flow rate to 30% of the design flow.

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“…Benini et al (2006) sugerem o uso de um modelo de fluxo em estado estacionário para impelidores, uma vez que as flutuações no fluxo de um compressor centrífugo são importantes apenas na folga do difusor, o que não é verificado para o impelidor sem difusor aqui estudado. Assim, definindo-se o fluxo foi como tridimensional, turbulento e compressível, no estado estacionário, é possível utilizar as equações de Navier-Stokes com média de Reynolds (RANS), em sua forma de conservação instantânea, para continuidade, quantidade de movimento e energia total em uma estrutura estacionária:…”

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Modelagem e simulação de escoamento turbulento em compressor de CO2 supercrítico.

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Experimental and numerical analyses to enhance the performance of a microturbine diffuser

Cited by 14 publications

References 20 publications

Effect of Micro Structures of Diffusers on Optical Properties of LED Light

Effect of Micro Structures of Diffusers on Optical Properties of LED Light

A study of off-design performance improvement for a centrifugal refrigerant compressor

Modelagem e simulação de escoamento turbulento em compressor de CO2 supercrítico.

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