CFD Study Of Flow Field Around Turbine

Hew, Wei Ren (2021) CFD Study Of Flow Field Around Turbine. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Depletion of fossil fuel caused mankind to look for sustainable and green energy resources. The characteristic of hydrokinetic turbine with ability to operate at low head stream and at low cost made it a good choice for use to harness hydro source of energy. As hydrokinetic turbine gain attention by the industry player, many experimental and Computational Fluid Dynamics (CFD) studies related to hydrokinetic turbine have been carried out. Yet the relationship of flow depth variation and wake recovery behind the turbine is still not fully understood. There is limited study about the effects of flow depth variations on the wake recovery behind the turbine. In this paper, a CFD model investigation was done based on published experimental work by Aghsaee and Markfort (2018). A hydrokinetic water turbine was drawn using the MHKF1-180 and NACA4418 foils dimensions. The transient CFD study is conduct using SST k- turbulence model and dynamic mesh method. As sensitivity result proved that SST k- turbulence model and dynamic mesh method give more accurate result compare to k-ε turbulence model and sliding mesh method. The results obtained in this study show that in near wake region, the wake at deeper depth will recover faster as deeper depth has larger surrounding flow field which is able to transfer momentum at a faster rate. At first investigation was planned for three different depths (110 mm, 125 mm and 140 mm) but due to limitation of time only two depths (110 mm and 125 mm) managed to be done in this study. The obtained result agrees well with the finding of Aghsaee and Markfort (2018) and a near wake observation was reported from the verified CFD models

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