Optimization of Flow Coefficient in Tubeaxial Fan at a Different Hub to Tip Ratio

Falahat, Alireza
September 2011
International Review of Mechanical Engineering;Sep2011, Vol. 5 Issue 6, p1095
Academic Journal
In this paper it is tried to find the best hub to tip ratio, the maximum number of blades, the best angle of attack of a flat blade at a fixed rotational speed for a maximum flow coefficient in a tubeaxial fan in a steady and turbulent conditions. In this study the blade angles were varied from 30 to 70 degrees, the hub to tip ratio was varied from 0.2 to 0.4 and the number of blades were varied from 2 to 6 at a fixed rotational speed. The results show that, the numerical and experimental results show that, the maximum flow coefficient is achieved at the blade angle of attack of between 45 to 55 degrees when the number of blades was equal to 4 at most rotational velocities.The numerical results show that as the hub to tip ratio was decreased, the flow coefficient was increased.


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