Effect of Change in the Curvature of Flow and Performance Characteristics of Straight and S-shaped Diffuser
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ORIGINAL CONTRIBUTION
Effect of Change in the Curvature of Flow and Performance Characteristics of Straight and S-shaped Diffuser Arun Gupta1 • Hardial Singh1
•
Ashok Kumar Raghav1
Received: 10 July 2019 / Accepted: 4 July 2020 The Institution of Engineers (India) 2020
Abstract The effect of the change in the curvature of the stream and the execution attributes of straight walled and S-shaped rectangular diffusers having a center-length of 500 mm and an area ratio of 1.5 is studied in this paper. Straight and S-shaped diffusers with a square inlet and a rectangular outlet have been fabricated using an alternate turn angle. The cross-flow velocity, static pressure and total pressure variation along the length, at different sections of the diffusers, are measured using pressure tapings and normal three-hole probe. The low performance is due to the generation of secondary flows as a result of the geometrical curvature and the additional losses are due to the surface roughness of the diffusers. The total pressure loss coefficient for all the diffusers is nearly identical and seems to be independent of the angle of turn. In this paper, results were shown in the form of pressure recovery coefficient, coefficient of total pressure loss, average cross-flow velocity and flow deviation. Furthermore, pressure and velocity contours were developed for the entire study of all four designs of the diffuser.
AS v e P Psi Ps CPR Re A2 W2 q Uavgi l Dh Pti Pt CTL
Aspect ratio Velocity of fluid (m/s) Rate of turbulent kinetic energy dissipation (J/kg.s) Pressure (Pa) Static pressure at inlet (Pa) Static pressure (Pa) Coefficient of static pressure recovery Reynolds number Area of outlet section (m2) Width of outlet (m) Density of fluid (kg/m3) Mass average mean velocity at inlet Viscosity of working fluid (Pa.s) Hydraulic diameter at the inlet (m) Total pressure at inlet (Pa) Total pressure (Pa) Coefficient of total pressure loss
Introduction Keywords Straight-walled diffuser S-shaped diffuser Flow deviation Coefficient of static pressure recovery Coefficient of total pressure loss List of Symbols AR Area ratio A1 Area of inlet section (m2) W1 Width of inlet (m) & Hardial Singh [email protected] 1
Department of Mechanical Engineering, Amity University Haryana, Gurgaon, India
Diffuser is a mechanical device that reduces the velocity and increases the static pressure. The main function of a diffuser is to convert the overall dynamic pressure into static pressure without the loss of mixture pressure. The diffuser’s task and configuration for the foremost part depend on the subsonic and supersonic section stream. The curved diffusers can be of two types: (1) A diffuser with the straight axis and curved wall (2) A diffuser whose sum bends and the curvature has a curved axis. Dean et al. [1] in their research studies the straight channel diffuser performance at high inlet Mach numbers. The pressure recovery of a straight wall, single plane
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J. Inst. Eng. India Ser. C
divergence diffuser with an inlet Mach num
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