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    Analytical method for predicting the pressure distribution about a nacelle at transonic speeds (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The formulation and development of a computer analysis for the calculation of streamlines and pressure distributions around two-dimensional (planar and axisymmetric) isolated nacelles at transonic speeds are described. The computerized flow field analysis is designed to predict the transonic flow around long and short high-bypass-ratio fan duct nacelles with inlet flows and with exhaust flows having appropriate aerothermodynamic properties. The flow field boundaries are located as far upstream and downstream as necessary to obtain minimum disturbances at the boundary. The far-field lateral flow field boundary is analytically defined to exactly represent free-flight conditions or solid wind tunnel wall effects. The inviscid solution technique is based on a Streamtube Curvature Analysis. The computer program utilizes an automatic grid refinement procedure and solves the flow field equations with a matrix relaxation technique. The boundary layer displacement effects and the onset of turbulent separation are included, based on the compressible turbulent boundary layer solution method of Stratford and Beavers and on the turbulent separation prediction method of Stratford.
    Keywords: AERODYNAMICS
    Type: NASA-CR-2217
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Computer program for steamtube curvature analysis: Analytical method (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Program provides design information for low-drag, high-drag-divergence, Mach number isolated nacelles suitable for use with advanced high-bypass-ratio, turbofan engines. One element is development of method to predict inviscid pressure distribution and flow field about arbitrary axisymmetric ducted body at transonic speeds.
    Keywords: MATHEMATICS AND INFORMATION SCIENCES
    Type: LAR-11535
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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