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Effect of varying inflow reynolds number on pressure recovery and flow uniformity of 3-D turning diffuser

Nordin , Normayati and Abdul Karim , Zainal Ambri and Othman, Safiah and R. Raghavan, Vijay (2013) Effect of varying inflow reynolds number on pressure recovery and flow uniformity of 3-D turning diffuser. In: 3rd International Conference and Exhibition on Sustainable Energy and Advanced Material (ICE-SEAM 2013) , 30-31 October 2013, MITC, Malacca.

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Abstract

Various diffuser types characterized by the geometry are introduced in the flow line to recover the energy. A 3-D turning diffuser is a type of diffuser that its cross-section diffuses in all 3 directions of axes, i.e. x, y and z. In terms of applicability, a 3-D turning diffuser offers compactness and more outlet-inlet configurations over a 2-D turning diffuser. However, the flow within a 3-D turning diffuser is expected to be more complex which susceptible to excessive losses. As yet there is no established guideline that can be referred to choose a 3-D turning diffuser with an optimum performance. This paper aims to investigate the effects of varying inflow Reynolds number (Rein) on the performance of 3-D turning diffuser with 90o angle of turn. The outlet pressure recovery (Cp) and flow uniformity (u) of 3-D turning diffuser with an area ratio (AR=2.16) and outlet-inlet configurations (W2/W1=1.44, X2/X1=1.5), operated at inflow Reynolds number of Rein= 5.786E+04-1.775E+05 have been experimentally tested. The experimental rig was developed incorporated with several features of low subsonic wind tunnel. This was mainly to produce a perfect fully developed and uniform flow entering diffuser. Particle image velocimetry (PIV) was used to examine the flow quality, and a digital manometer provided the average static pressure of the inlet and outlet of turning diffuser. There is a promising improvement in terms of flow uniformity when a 3-D turning diffuser is used instead of a 2-D turning diffuser with the same AR. An unexpected trend found with a drop of pressure recovery at maximum operating condition of Rein=1.775E+05 shall require further investigations. The results obtained from this study will be in future used to validate the numerical codes. Upon successful validation, several other configurations will be numerically tested in order to establish the guidelines in the form of mathematical models.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: turning diffuser; flow uniformity; pressure recovery; particle image velocimetry (PIV)
Subjects: T Technology > TJ Mechanical engineering and machinery > TJ1-162 Mechanical engineering and machinery
Divisions: Faculty of Mechanical and Manufacturing Engineering > Department of Plant and Automotive Engineering
Depositing User: Mrs. Normayati Nordin
Date Deposited: 12 Dec 2013 07:26
Last Modified: 12 Dec 2013 07:26
URI: http://eprints.uthm.edu.my/id/eprint/4594
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