Influence of Freely Rotating Inlet Guide Vanes on the Return Flows and Stable Operating Range of an Axial Flow Fan

[+] Author and Article Information
N. Venkatrayulu

Department of Mechanical Engineering, Indian Inst. of Technology, Madras 600 036, India

D. Prithvi Raj

Thermal Turbomachines Laboratory, Department of Mechanical Engineering, Indian Inst. of Technology, Madras 600 036, India

R. G. Narayanamurthi

Indian Institute of Technology, Madras 600 036, India

J. Eng. Power 102(1), 75-80 (Jan 01, 1980) (6 pages) doi:10.1115/1.3230237 History: Received December 08, 1979; Online September 28, 2009


This paper presents the results of experimental investigations on the three-dimensional flow and performance characteristics of a free vortex axial flow fan rotor, with a freely rotating and braked inlet guide vane row. The influences of axial distance between the inlet guide vane row and the rotor inlet, inlet guide vane setting angle and shape, partial omission of guide vanes at the hub and tip regions on the return flows have been studied and optimum axial distance and setting angle that will improve the useful operating range of the fan were determined. Use of freely rotating inlet guide vanes at high flow volumes and braked inlet guide vanes at low flow coefficients resulted in a reduction of return flows and an increase of the stable operating range of the axial fan rotor by more than 35 percent and this combination has yielded higher efficiencies as well in the extended region of stable operation.

Copyright © 1980 by ASME
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