Effects of geometry and reynolds number on savonious type rotors

Shankar, PN (1976) Effects of geometry and reynolds number on savonious type rotors. Technical Report. National Aeronautical Laboratory, Bangalore, India.

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Abstract

Results are presented of a fairly comprebensive experimental study of tbe effects of geometry and Reynolds13; number on model Savonius type rotors. Tbe influence on tbe13; aerodynamic performance of the number of blades, gap widtb13; and blade curvature have been determined. Tests were done13; at Reynolds numbers between 1 x 105 and 2 x 105. The efficiency of the rotors generally increases wi tb Reynolds13; number in the range considered. While the starting torque13; is slightly higher and the IU1gular regions of negative13; torque are less or absent it is found that the 3 bladed13; rotors have upto :55% lower peak efficiency thaa 2 bladed13; rotors. The op.rating tip speed ratios are also generally13; lower. It must therefore be concluded that unless improved13; starting performance is the main criterion 3 bladed rotors13; are less efficient than 2 bladed rotors.

Item Type: Monograph (Technical Report)
Uncontrolled Keywords: Geometry;Reynolds number;Savonious type rotors;Aerodynamic performance
Subjects: AERONAUTICS > Aerodynamics
Depositing User: Users 60 not found.
Date Deposited: 23 Mar 2010
Last Modified: 24 May 2010 04:18
URI: http://nal-ir.nal.res.in/id/eprint/2479

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