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Experimental investigation of 2-D turning diffuser performance by varying inflow Reynolds Number

Nordin, Normayati and Abdul Karim, Zainal Ambri and Othman, Safiah and Raghavan, Vijay R. (2013) Experimental investigation of 2-D turning diffuser performance by varying inflow Reynolds Number. In: Proceedings of the International Conference on Mechanical, Automotive and Aerospace Engineering (ICMAAE 2013), 2-4 July 2013, Kuala Lumpur.

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Abstract

A turning diffuser is a kind of adapter used in the fluid flow system to recover surplus energy by converting kinetic energy to pressure energy. Nevertheless, minimal energy is commonly recovered as the flow within turning diffuser is often disrupted due to the nature of its geometry, leading to excessive losses. This paper aims to investigate the performance of 2-D turning diffuser by varying inflow Reynolds number (Rein). The outlet pressure recovery (Cp) and flow uniformity (σu) of 2-D turning diffuser with an area ratio of AR=2.16, 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 at the inlet and outlet of turning diffuser. The best produced pressure recovery of Cp=0.239 was recorded when the system was operated at maximum Rein=1.775E+05. However, the flow uniformity was considerably distorted, σu=6.12 with the increase of Rein Keywords- turning diffuser; flow uniformity; pressure recovery; particle image velocimetry (PIV) mainly due to secondary flow separation. A compromise between the maximum permissible pressure recovery and flow uniformity needs to be sought. The results obtained from this study will be in future used to validate the CFD codes. Several other configurations will be tested numerically in order to establish mathematical models.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: turning diffuser; flow uniformity; pressure recovery; particle image velocimetry (PIV)
Subjects: T Technology > TH Building construction > TH7005-7699 Heating and ventilation. Air conditioning
Divisions: Faculty of Mechanical and Manufacturing Engineering > Department of Plant and Automotive Engineering
Depositing User: Normajihan Abd. Rahman
Date Deposited: 14 Oct 2013 02:22
Last Modified: 21 Jan 2015 08:13
URI: http://eprints.uthm.edu.my/id/eprint/4372
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