Experimental investigation of pressure losses and flow characteristics in bend-diffusers by means of installing turning baffles
A combined bend-diffuser is often used either as an ejector or an adapter in a duct line. Flow within a bend-diffuser is complex to be judged, thus susceptible to losses. In this study, turning baffles were used particularly to improve the overall performance of system in terms of pressure losses re...
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2011
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| நிகழà¯à®¨à®¿à®²à¯ˆ அணà¯à®•à®²à¯: | http://eprints.uthm.edu.my/4596/ http://eprints.uthm.edu.my/4596/1/ICME_2011__1_%2C_6%2D7_June_2011%2C_Putrajaya.pdf |
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| தொகà¯à®ªà¯à®ªà¯: | A combined bend-diffuser is often used either as an ejector or an adapter in a duct line. Flow within a bend-diffuser is complex to be judged, thus susceptible to losses. In this study, turning baffles were used particularly to improve the overall performance of system in terms of pressure losses reduction and flow uniformity. The mechanisms of pressure losses and flow characteristics in a bend-diffuser with and without turning baffles were experimentally investigated. Bend-diffusers with and without baffles of 90o bend angle and area ratio (AR) of 7.2 were considered. Static pressure and air velocity were measured using pitot static probe and digital manometer with accuracy of 0.1Pa by traversing. Three stations, i.e., before bend (S1), before diffuser (S2), and after diffuser (S3) with two planes each were considered for measurement. Pressure losses coefficients obtained for a bend-diffuser without baffle were Kbend(w/o), 1.249 and 1.145 for (a) and (b) planes respectively, Kdiffuser(w/o), 1.290 and 0.578 for (a) and (b) planes respectively and Ksystem(w/o), 1.306 and 1.746 for (a) and (b) planes respectively. For a bend-diffuser with baffle, Kbend(with), 0.227 and – 0.351 for (a) and (b) planes respectively, Kdiffuser(with), 2.899 and 1.275 for (a) and (b) planes respectively and Ksystem(with), 0.573 and -0.134 for (a) and (b) planes respectively. The baffles installed in a bend-diffuser is proven to improve the overall system performance in terms of pressure losses reduction, however, further efforts should be taken to impro vve flow uniformity. |
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