Effect of turning angle on performance of 2-D turning diffuser via Asymptotic Computational Fluid Dynamics

Khong, Y T; Nordin, Normayati; Seri, Suzairin Md; Mohammed, Akmal Nizam; Sapit, Azwan; Taib, Ishkrizat; Abdullah, Kamil; Sadikin, Azmahani; Razali, Mohd Azahari

doi:10.1088/1757-899x/243/1/012013

Cited by 4 publications

(10 citation statements)

References 13 publications

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“…The performance correlations for 2-D curved diffuser with varying angle of turn from 30°to 180° were developed by using the technique of Asymptotic Computational Fluid Dynamics (ACFD). The main steps to develop the performance correlation for 2-D curved diffuser using ACFD technique are as follows [2,12,16]:…”

Section: Acfd Methodsmentioning

confidence: 99%

“…These indexes are greatly affected by the diffuser's geometry and operating parameters. Previous studies proved that the performance of a curved diffuser is affected by its degree of angle of turn [12]. Due to the curved geometry of a diffuser, the centrifugal force created inside it which results in flow separation would decrease the performance of a curved diffuser [13].…”

Section: Introductionmentioning

confidence: 99%

“…There are currently correlations for curved diffusers such as the work of Nordin et al, [14] and Khong et al, [12] but it is not comprehensive enough to include angle variations from 30°to 180°. Thus, the objective of the current study is to evaluate numerically the effect of angle of turn on performance and develop the performance correlations of 2-D curved diffuser by varying the angle of turn from 30°to 180°.…”

Section: Introductionmentioning

confidence: 99%

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Development of Performance Correlations using ACFD Method for 2-D Curved Diffuser

Shariff¹,

Nordin²,

Chun³

et al. 2020

CFDL

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Diffuser is a fluid mechanical device which allows the recovery of pressure energy from the fluid flow on the outlay of kinetic energy. Performance of turning diffuser is evaluated primarily by pressure recovery coefficient, and flow uniformity,. The varying of geometrical and operating parameters could alter the performance of the diffuser. Hence, this study aims to investigate the effect of angle of turn, on 2-D curved diffuser performance and to develop performance correlations. The angle of turn was varied from 30°to 180°. The evaluation for performance of the curved diffusers was done by using ANSYS Fluent with the most appropriate turbulence model of Reynolds Stress Model (RSM) added with enhanced wall treatment of + =1.0. Performance correlations in terms of pressure recovery and flow uniformity were developed by implementing Asymptotic Computational Fluid Dynamics (ACFD) technique. Pressure recovery of the curved diffusers showed a declining pattern by approximately 79.5% while flow uniformity shows higher distortion up to 52.6% with the increase of angle of turn from 30°to 180°. Hence, it has been proven that the increase of angle of turn has affected the performance of curved diffuser significantly. The ACFD performance correlations has provided acceptable deviations to both CFD and experimental results.

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Section: Acfd Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Development of Performance Correlations using ACFD Method for 2-D Curved Diffuser

Shariff¹,

Nordin²,

Chun³

et al. 2020

CFDL

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show abstract

“…In fluid analysis, outlet pressure recovery coefficient, Cp and flow uniformity index, σout are basically used to measure the performances of the diffusers. Asymptotic Computational Fluid Dynamics (ACFD) is the technique combining the asymptotic analysis with Computational Fluid Dynamics that could provide a relationship between dependent and independent variables [1,5].…”

Section: Introductionmentioning

confidence: 99%

“…The main problem in achieving high recovery is the flow separation which results in non-uniform flow distribution and excessive losses [4,5]. The geometrical curve shape of turning diffuser will reduce the pressure recovery and flow uniformity and hence the diffuser performance is decreased [5 -7].…”

Section: Introductionmentioning

confidence: 99%

Asymptotic Computational Fluid Dynamic (ACFD) Study of Three-Dimensional Turning Diffuser Performance by Varying Angle of Turn

Tham

Nordin

Hariri

et al. 2019

IJIE

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Effect of Expansion Direction/Area Ratio on Loss Characteristics and Flow Rectification of Curve Diffuser

Nordin

Manshoor

Karim

et al. 2021

CFDL

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Curve diffuser is frequently used in applications such as HVAC, wind- tunnel, gas turbine cycle, aircraft engine etc. as an adapter to join the conduits of different cross-sectional areas or an ejector to decelerate the flow and raise the static pressure before discharging to the atmosphere. The performance of the curve diffuser is greatly affected by the abrupt expansion and inflection introduced, particularly when a sharp 90o curve diffuser is configured with a high area ratio (AR). Therefore, the paper aims to numerically investigate the effect of the expansion direction of AR=1.2 to 4.0 curve diffuser on loss characteristic and flow rectification. 90o curve diffuser operated at inflow Reynolds Number, Rein=5.934 × 104 to 1.783 × 105 was considered. Results show that pressure recovery improves when the area ratio increases from 1.2 to 2.16 for both 2D expansion (z- direction) and 3D expansion (x- and z- direction). On the other hand, the increase of inflow Reynolds number causes the flow uniformity to drop regardless of the expansion directions. 3D expansion (x- and z- direction) curve diffuser with AR=2.16, operated at Rein=8.163 × 104, is opted as the most optimum, producing the best pressure recovery up to 0.380. Meanwhile, 2D expansion (z-direction) curve diffuser of AR=2.16, , operated at Rein= 5.934 × 104, is chosen to provide the best flow uniformity of 2.330 m/s. 2D expansion (x- direction) should be as best avoided as it provides the worst overall performance of 90o curve diffuser.

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Effect of turning angle on performance of 2-D turning diffuser via Asymptotic Computational Fluid Dynamics

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Cited by 4 publications

References 13 publications

Development of Performance Correlations using ACFD Method for 2-D Curved Diffuser

Development of Performance Correlations using ACFD Method for 2-D Curved Diffuser

Asymptotic Computational Fluid Dynamic (ACFD) Study of Three-Dimensional Turning Diffuser Performance by Varying Angle of Turn

Effect of Expansion Direction/Area Ratio on Loss Characteristics and Flow Rectification of Curve Diffuser

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