Experimental Study of Flow in a High Aspect Ratio 90 Deg Curved Diffuser

Majumdar, B. C.; Mohan, Ratan; Singh, Sadhna; Agrawal, D. P.

doi:10.1115/1.2819668

Cited by 15 publications

(6 citation statements)

References 13 publications

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“…M. J. Werle등은 덕트 형태의 풍력 혹은 유체 터빈에 대한 성능증가를 제시하였 다 (12) . 또한 B. Majumdar등은 덕트의 가로-세로 종 횡비(aspect ratio)에 따른 덕트 내 확산기 형상이 유체에 미치는 영향을 실험적으로 제시하였다 (13) . (4) .…”

Section: 서 론unclassified

Study on Flow Velocity Control of a Multiple Hydrofoil Duct via Flow Visualization Techniques

Kim¹,

Sitorus²,

Won³

et al. 2016

Journal of the Korean Society of Visualization

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In this work, we investigate the flow velocity controllability of a diffuser-type multiple hydrofoil duct by experimental and numerical flow visualization approaches. The flow velocity controllability is analyzed by changing the angle of the hydrofoil near the outlet, which is the diffuser, while the incoming flow velocity is 0.6 m/s in the experiment. When the diffuser angle is changed from 0 to 7.5 degree, the maximum velocity inside the duct is varied from 1.35 m/s to 1.52 m/s. Also, it is shown from the numerical analysis that the maximum velocity is varied from 1.09 m/s to 1.17 m/s in the same condition. Thus, the aspect of the acceleration in the duct due to the increase of the diffuser angle is similar between the both approaches. Therefore, the multiple hydrofoil duct can be used to control the flow speed inside the duct for continuously extracting power close to a rated capacity.

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Section: 서 론unclassified

Study on Flow Velocity Control of a Multiple Hydrofoil Duct via Flow Visualization Techniques

Kim¹,

Sitorus²,

Won³

et al. 2016

Journal of the Korean Society of Visualization

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“…They have proposed distinctive strategies for enhancing the result of executed work. Majumdar et al [5] analyzed concentrated the flow in an S-formed diffusing pipe of rectangular cross-sectional and having area ratio 2. They found that vertical movements created in the pipe alter their course of revolution past the enunciation plane.…”

Section: Introductionmentioning

confidence: 99%

Flow Performance Comparison Along the Centerline in Straight and S-Shaped Diffuser

Singh¹

2020

Journal of Thermal Engineering

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In this paper of the S-shaped diffuser with area ratio (AR) 1.5, an experimental investigation was conducted to analyze the effect of the change in curvature of a straight-wall diffuser. During this study, a Straight diffuser was changed in to a curved diffuser at different angles as their same upper and lower limbs (60/60, 90/90). Profile equations of diffusers were generated with the help of MATLAB/Simulink v2017a software. In this work centerline length is constant for all three profiles, Centerline length that's utilized in the sector of circle and radius of curvature is calculated. S-shaped diffuser had a different unique angle with square inlet and a rectangular outlet. S-shaped diffuser CPR and CTL results compared with a straight walled diffuser with the different inlet velocity and Reynolds Number. These outcomes from this research obtained the coefficient of static pressure gain and coefficient of total pressure loss for the three profile of the diffuser (Straight, 60/60, and 90/90 S-Shaped Diffuser).

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“…Experiments to determine the flow structure in a large area (AR=3.4) curved diffuser (Δβ=90 o with elliptical centre line was carried out by Majumadar et al, [13]. Majumadar et al, [14] made detailed flow velocity, pressure and turbulence intensity measurements in a 90 o turn curved diffuser of inlet aspect ratio 6 and area ratio 2. Weng and Guo, [15] presented a new approach of swirl control in an S shaped diffuser, called the 'Automatic Adjustable Blade (AAB) method.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis on Flow Through S Shaped Diffusers

Agrawal¹,

Powle²

2020

RJET

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Many times, due to space limitations it is necessary to decelerate and turn fluid simultaneously. For such requirement curved diffusers are being used. Five S shaped diffusers of turning angle 120 o were fabricated. The area ratio was 2.5, 3.5, 4.5, 5.5 and 6.5. The pressure on the outer wall is more than that on the inner wall in the first curvature and less in the second curvature. Variation in actual pressure recovery coefficient (Cp) and pressure recovery efficiency (η) is not very much within the range of Reynolds number tested for a particular diffuser. As area ratio increases value of Cp and η also increases. The optimum area ratio for 120 o diffuser is 4.5.

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Experimental Study of Flow in a High Aspect Ratio 90 Deg Curved Diffuser

Cited by 15 publications

References 13 publications

Study on Flow Velocity Control of a Multiple Hydrofoil Duct via Flow Visualization Techniques

Study on Flow Velocity Control of a Multiple Hydrofoil Duct via Flow Visualization Techniques

Flow Performance Comparison Along the Centerline in Straight and S-Shaped Diffuser

Performance Analysis on Flow Through S Shaped Diffusers

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