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  • 1
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    Investigation of boundary layer and turbulence characteristics inside the passages of an axial flow inducer (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A study of the boundary layer and turbulence characteristics inside the passages of an axial flow inducer is reported. The first part deals with the analytical and experimental investigation of the boundary layer characteristics in a four bladed flat plate inducer passage operated with no throttle. An approximate analysis for the prediction of radial and chordwise velocity profiles across the passage is carried out. The momentum integral technique is used to predict the gross properties of the boundary layer. Equations are given for the exact analysis of the turbulent boundary layer characteristics using the turbulent field method. Detailed measurement of boundary layer profiles, limiting streamline angle and skin friction stress on the rotating blade is also reported. Part two of this report deals with the prediction of the flow as well as blade static pressure measurements in a three bladed inducer with cambered blades operated at a flow coefficient of 0.065. In addition, the mean velocity and turbulence measurements carried out inside the passage using a rotating triaxial probe is reported.
    Keywords: FLUID MECHANICS
    Type: NASA-CR-121248 , PSU-AERSP-73-9
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Turbulent boundary layer on a rotating helical blade. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Investigation of 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 is 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.
    Keywords: FLUID MECHANICS
    Type: Journal of Fluid Mechanics; 51; Feb. 8
    Format: text
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