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Vortex/Jet/Wing Viscous Interaction Theory and Analysis.

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Technical rept. 1 Mar 75-29 Feb 76,

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A computational fluid mechanical model has been developed for analyzing the loads and flow mechanism due to vortexwingjet interaction. Examples are leading edge vortices formed on highly swept delta wings or moderately swept wings with vortex control by jets or passive control such as strakes. The computational model is applicable to a wide class of viscous flows but is particularly suitable for calculating vortex-type flows near no-slip or solid boundaries. The model is based on reducing the full Navier-Stokes equations to parabolic form with respect to one of the three space coordinates. The method is particularly attractive because of the economy of computing time. Minutes rather than hours bring the solution of the Navier-Stokes equations into the engineering realm. Further development of the model is required, but its present state is quite useful for evaluating certain flow mechanisms. Examples of computations for various vortexwingjet interactions are presented in the report. Experimental pressure, laser velocimeter, and flow visualization data are presented for an unswept wing with leading edge vortex control by spanwise blowing. These data are used to analyze the formation and strength of the leading edge vortex and as examples of typical inputoutput data for the computational model. Author

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  • Aircraft
  • Fluid Mechanics

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