Flow characteristics inside a diffuser of complex shape

Flow characteristics inside a diffuser of complex shape -...

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Unformatted text preview: 277 Flow characteristics inside a di V user of complex shape M E H Benhamza 1 *, L Khezzar 2 and A J Marquis 3 1 Centre Universitaire de Guelma, Algeria 2 College of Engineering, Sultan Qaboos University, Muscat, Oman 3 Mechanical Engineering Department, Imperial College of Science, Technology and Medicine, London, UK Abstract: An experimental study was made of an incompressible flow through a model S-shaped semicircular to circular transition di V using duct. The transition di V user has a lengthexit diameter ratio of 3 and a duct o V set ratio of 0.3. The operating Reynolds number based on hydraulic diameter and bulk velocity is 40 000. The refraction index matching technique and laser Doppler velocimetry were used for velocity measurements. The measurements indicate that flow distortion persists at the outlet and the separation of the boundary layers is incipient. Semicircular to circular transition duct flow was studied in order to document the transition duct flow field and to provide detailed duct flow data for comparison with numerical code prediction. Experimental results also suggest thatflow data for comparison with numerical code prediction....
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