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Turbulent boundary layer on a rotating helical blade

Published online by Cambridge University Press:  29 March 2006

B. Lakshminarayana ,
A. Jabbari  and
H. Yamaoka
B. Lakshminarayana
Affiliation:
Department of Aerospace Engineering, The Pennsylvania State University
A. Jabbari
Affiliation:
Department of Aerospace Engineering, The Pennsylvania State University
H. Yamaoka
Affiliation:
Department of Aerospace Engineering, The Pennsylvania State University
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Abstract

This paper investigates the boundary-layer characteristics on a helical blade of large chord length, enclosed in an annulus and rotating in a fluid otherwise at rest. The three-dimensional form of momentum integral equations is derived, and used to predict the boundary-layer growth and limiting streamline angles on the blade surface. The measurements are in general agreement with the predictions. The wall shear stress correlation, which includes both Reynolds number and rotation parameters, valid for a rotating blade operating at zero pressure gradient, is derived. Radial and tangential velocity profiles, the tangential component of turbulence intensity and blade static pressures are measured at several locations on the blade surface. The nature of flow near the blade tip is discussed. An expression for the radial velocity profile, valid in the outer region of the boundary layer, is derived theoretically.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 51 , Issue 3 , 8 February 1972 , pp. 545 - 569
Copyright
© 1972 Cambridge University Press

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