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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.5

ISSN Imprimer: 2152-5102
ISSN En ligne: 2152-5110

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International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.2018019044
pages 399-412

ESTIMATION OF EFFECTIVE LENGTH ALONG WITH FLOW AND PRESSURE CHARACTERISTIC ANALYSES OF A SUDDEN EXPANSION DIFFUSER AND A HYBRID DIFFUSER

Ashim Guha
Department of Mechanical Engineering, Indian Institute of Engineering Science and Technology, Shibpur, Howrah—711 103, West Bengal, India
Dipak Kumar Mandal
Deptartment of Mechanical Engineering, College of Engineering & Management, Kolaghat, P.O: K.T.P.P. Township, Midnapore (E) - 721171, West Bengal, India
Nirmal Kumar Manna
Department of Mechanical Engineering, Jadavpur University Kolkata, 700032, West Bengal, India
Somnath Chakrabarti
Department of Mechanical Engineering, Indian Institute of Engineering Science and Technology Shibpur, Howrah, 711103, West Bengal, India

RÉSUMÉ

In this paper, the performance simulation of a sudden expansion diffuser and a hybrid diffuser has been carried out. The two-dimensional steady differential equations for conservation of mass and momentum have been solved for Reynolds numbers ranging from 50 to 600. During the simulation, a fixed aspect ratio of 2 has been considered for both diffuser geometries, and a fixed value of half divergence angle of 3.5° has been considered for the hybrid diffuser. At the inlet, a fully developed velocity profile has been used. The effect of Reynolds number on streamline contours and average static pressure has been studied in detail and compared between two diffuser geometries. The effective diffuser lengths for achieving maximum average static pressure at the diffuser exit have been computed for the considered Reynolds numbers.


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