Navier-Stokes calculations of hovering rotor flowfields

Abstract : Unsteady, thin layer Navier-Stokes equations written in rotor coordinates are solved using a partially flux-split, implicit numerical algorithm to calculate the flow fields of a hovering rotor blade at subsonic and transonic conditions. Numerical results are in good agreement with experimental data for both nonlifting and lifting rectangular blades. For the lifting case, the rotor wake effects are modeled by applying a correction to the geometric angle of attack of the blades. Alternate methods of calculating the hovering rotor flowfields in blade-fixed mode that have the same circulation distribution as hovering blade are explored. All of the results presented in this paper are computed on a CRAY 2 supercomputer.

[1]  Francis X. Caradonna,et al.  Subsonic and Transonic Potential Flow over Helicopter Rotor Blades , 1972 .

[2]  M. Isom.  Unsteady Subsonic and Transonic Potential Flow over Helicopter Rotor Blades , 1974 .

[3]  H. Lomax,et al.  Thin-layer approximation and algebraic model for separated turbulent flows , 1978 .

[4]  D. R. Clark.  Lifting Surface Method For Hover/Climb Airloads , 1979 .

[5]  Wayne Johnson,et al.  A Comprehensive Analytical Model of Rotorcraft Aerodynamics and Dynamics. Part 1. Analysis Development , 1980 .

[6]  J. Steger,et al.  Generation of Body-Fitted Coordinates Using Hyperbolic Partial Differential Equations , 1980 .

[7]  J. Steger,et al.  Implicit Finite-Difference Simulations of Three-Dimensional Compressible Flow , 1980 .

[8]  F. X. Caradonna,et al.  Experimental and Analytical Studies of a Model Helicopter Rotor in Hover , 1980 .

[9]  J. Steger,et al.  Computation of simple three-dimensional wing-vortex interaction in transonic flow , 1981 .

[10]  J. Steinhoff,et al.  The treatment of vortex sheets in compressible potential flow , 1983 .

[11]  N. N. Mansour,et al.  Numerical Simulation of the Tip Vortex Off a Low-Aspect-Ratio Wing at Transonic Speed , 1984 .

[12]  Lakshmi N. Sankar,et al.  Solution of transonic flow past rotor blades using the conservative full potential equation , 1985 .

[13]  N. Mansour.  Computation of the tip vortex off a low-aspect-ratio wing , 1985 .

[14]  A. J. Landgrebe.  Overview of helicopter wake and airloads technology , 1985 .

[15]  B. E. Wake,et al.  Computation of rotor blade flows using the Euler equations , 1985 .

[16]  E. M. Murman,et al.  Solution method for a hovering helicopter rotor using the Euler equations , 1985 .

[17]  J. Steger,et al.  Numerical simulation of unsteady, viscous, high-angle-of-attack flows using a partially flux-split algorithm , 1986 .

[18]  L. Sankar,et al.  Euler calculations for rotor configurations in unsteady forward flight , 1986 .

[19]  Ramesh K. Agarwal,et al.  Euler calculations for flowfield of a helicopter rotor in hover , 1986 .

[20]  Chee Tung,et al.  Euler solution of the transonic flow for a helicopter rotor , 1987 .

[21]  R. Strawn,et al.  Conservative full-potential model for unsteady transonic rotor flows , 1987 .

[22]  Jerry Deese,et al.  An Euler solver for calculating the flowfield of a helicopter rotor in hover and forward flight , 1987 .

[23]  Man Mohan Rai,et al.  Navier-Stokes Simulations of Blade-Vortex Interaction Using High-Order-Accurate Upwind Schemes , 1987 .

[24]  J. Steinhoff,et al.  Free-wake analysis of compressible rotor flows , 1987 .

[25]  J. Baeder,et al.  Numerical simulation of tip vortices of wings in subsonic and transonic flows , 1988 .

[26]  W. Mccroskey,et al.  Numerical Simulation of Helicopter Multi-Bladed Rotor Flow , 1988 .

[27]  B. Wake,et al.  Solutions of the Navier-Stokes Equations for the Flow About a Rotor Blade , 1989 .