Experimental Validation of Numerically Optimized Short Annular Diffusers

Cerantola, D. J.; Birk, A. M.

doi:10.1115/gt2013-94648

Cited by 3 publications

(5 citation statements)

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“…The best pressure recovery performance of 0.445 was obtained at curved diffuser with area ratio of 2 and operated at Reynolds number of 6 x10 4 . Meanwhile, the highest flow uniformity index of 32.04 was obtained at curved diffuser with area ratio of 3 and operated at Reynolds number of 30 x10 4 . From the results, the pressure recovery performance was higher when the area ratio of curved diffuser is low and operated at the lowest Reynolds number.…”

Section: Discussionmentioning

confidence: 96%

“…Flows in diffuser occurs in various engineering devices such as wind tunnel system, HVAC, aircraft engineering etc. Moreover, various types of diffusers which are commonly classified by their geometries and applications such as annular, pyramidal, slab, S-shaped and Y-shaped diffusers [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. The performance of curved diffuser often evaluated based on its pressure recovery and flow uniformity index.…”

Section: Introductionmentioning

confidence: 99%

“…Sudo et al, [12] have run experimental works for 90° and 180° turning angle on a curved diffuser with an objective also to describe the performance based on its pressure recovery. The curved diffuser was built with the same outlet and inlet diameter of 104 mm, radius of curvature of 208 mm and operated at Reynolds number of 6x10 4 . The result of pressure recovery displayed at turning angle of 90° were higher than 180° curved diffuser as the effect of flow separation occur is lower.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Numerical Investigation of 180o Curved Diffuser Performance by Varying Geometrical and Operating Parameters

Rasidi¹,

Seri²,

Nordin³

et al. 2020

CFDL

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The geometry of a curved diffuser often inviting the flow to separate. The flow separation phenomenon plays a vital role in the recovery of pressure inside the diffuser. Besides, the geometrical and operating aspects of a curved diffuser have always been taken into consideration in most relatable researches. Pressure recovery and flow uniformity of a steady, developed entering turbulent flow of a circularsectioned 180° curved diffuser has been investigated numerically by varying geometrical and operating parameters. The curved diffuser with area ratio (2, 3 and 4), radius of inlet and curvature of respectively 50 mm and 180 mm was considered. Different values of Reynolds number 6 × 10 4 , 12 × 10 4 , 18 × 10 4 , 24 × 10 4 , and 30 × 10 4 were tested in every area ratio set. ANSYS code Fluent was used to run the simulation by considering different turbulence models, i.e. the standard kturbulence model (std k-), Spalart-Allmaras turbulence model (SA), k-kl-transition turbulence model and transition SST model. The present work proposed the curved diffuser with AR=2 operated at Re=6x10 4 as the optimum set of parameters, with minimal flow separation occurring in the system.

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Section: Discussionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical Investigation of 180o Curved Diffuser Performance by Varying Geometrical and Operating Parameters

Rasidi¹,

Seri²,

Nordin³

et al. 2020

CFDL

View full text Add to dashboard Cite

show abstract

“…It combines evolutionary strategies with surrogate models in order to select optimal geometric parameters. In the meantime, Cerantola and Birk 46 has carried out the optimized short annular diffuser design from a set of ideal solutions determined by a numerical multiobjective optimization study.…”

Section: Design Optimization Of Exhaust Volutes Towards Improving the Turbine-volute Performancementioning

confidence: 99%

Advances in coupled axial turbine and nonaxisymmetric exhaust volute aerodynamics for turbomachinery

Gao

Tao

Huo

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part G:

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Marine, industrial, turboprop and turboshaft gas turbine engines use nonaxisymmetric exhaust volutes for flow diffusion and pressure recovery. These processes result in a three-dimensional complex turbulent flow in the exhaust volute. The flows in the axial turbine and nonaxisymmetric exhaust volute are closely coupled and inherently unsteady, and they have a great influence on the turbine and exhaust aerodynamic characteristics. Therefore, it is very necessary to carry out research on coupled axial turbine and nonaxisymmetric exhaust volute aerodynamics, so as to provide reference for the high-efficiency turbine-volute designs. This paper summarizes and analyzes the recent advances in the field of coupled axial turbine and nonaxisymmetric exhaust volute aerodynamics for turbomachinery. This review covers the following topics that are important for turbine and volute coupled designs: (1) flow and loss characteristics of nonaxisymmetric exhaust volutes, (2) flow interactions between axial turbine and nonaxisymmetric exhaust volute, (3) improvement of turbine and volute performance within spatial limitations and (4) research methods of coupled turbine and exhaust volute aerodynamics. The emphasis is placed on the turbine-volute interactions and performance improvement. We also present our own insights regarding the current research trends and the prospects for future developments.

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“…They have observed two elliptically shaped counter rotating recirculation vortices behind the dump plane and a central recirculation zone just downstream of dump plane. Cerantola and Birk [10] have experimentally and numerically evaluated short annular diffusers with conical expansion at exit of the annulus using swirlers with different swirl angles. They have considered three area ratios such as 1.61, 1.91 and 2.73 for an inlet Reynolds number of 1.4 × 10 5 .…”

Section: Introductionmentioning

confidence: 99%

Pressure Characteristics Study for the Configuration of Sudden Expansion with Central Restriction and Suction

Das

Chakrabarti

2016

OJFD

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In this paper, an extensive numerical study on pressure characteristics in the configuration of sudden expansion with central restriction and suction has been carried out. During study, Reynolds numbers (Re) are considered from 50 to 200, suction (S) from 2% to 10% of inlet mass flow, percentage of central restriction (CR) from 0% to 40% and aspect ratio (AR) from 2 to 6. The effects of each variable on average static pressure distribution and average stagnation pressure distribution have been studied in detail. The results have been compared with the configuration of plain sudden expansion, and sudden expansion with central restriction only. From the study, it is noted that maximum magnitude of average static pressure rise from throat increases with the increase in percentage of suction, flow Reynolds number and percentage of central restriction. This magnitude is higher at lower aspect ratio. Also, it is observed that maximum magnitude of average static pressure rise from throat is always more in case of suction configuration compared to the case of configuration of without suction. Average stagnation pressure drop at any section increases with the increase in percentage of suction and percentage of central restriction, but it decreases with the increase in Reynolds number. It is noted that higher pressure drop at any section occurs at higher aspect ratio. This pressure drop at a section is more in case of suction configuration compared to the case of without suction.

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Experimental Validation of Numerically Optimized Short Annular Diffusers

Cited by 3 publications

References 0 publications

Numerical Investigation of 180o Curved Diffuser Performance by Varying Geometrical and Operating Parameters

Numerical Investigation of 180o Curved Diffuser Performance by Varying Geometrical and Operating Parameters

Advances in coupled axial turbine and nonaxisymmetric exhaust volute aerodynamics for turbomachinery

Pressure Characteristics Study for the Configuration of Sudden Expansion with Central Restriction and Suction

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