Recent advances in computing subsonic flow have been applied to helicopter configurations with various degrees of success. This paper is a comparison of two specific methods applied to a particularly challenging regime of helicopter flight, very low speeds, where the interaction of the rotor wake and the fuselage are most significant. Comparisons are made between different methods of predicting...

The wing of missile can be considered as an effective factor for determination lift to drag ratio. However, there are few studies that investigate effect on aerodynamics. Therefore, the purpose this study is indicate aerodynamics and optimize geometry enhancement aerodynamic efficiency. designed tail-fin configuration selected from a previous which contains experimental data. In beginning study...

By using a combined analytical–computational methodology, a unified modelling of aerodynamic indicial functions covering the incompressible, subsonic compressible, transonic, and supersonic flight speed regimes is presented. The procedure is carried out in conjunction with a computational fluid dynamic analysis. For a plunging–pitching airfoil, selected unsteady aerodynamic load expressions hav...

This paper presents a method to model and analyze the coupled nonlinear flight dynamics and aeroelasticity of highly flexible flyingwings. A low-order nonlinear strain-based finite element framework is used, which is capable of capturing the fundamental impact of geometrically nonlinear effects in a computationally effective formulation target for preliminary vehicle design and control evaluati...

Fluid–structure interaction problems in general are often too complex to solve analytically and so they have to be analyzed by means of experiments or numerical simulation. Studying these phenomena requires modeling of both fluid and structure. Many approaches in computational aero elasticity seek to synthesize independent computational approaches for the aerodynamic and the structural dynamic ...

fleeter, S., "Fluctuating Lift and Moment Coefficients for Cascade Airfoils in a Nonuniform Compressible Flow," Journal of Aircraft, Vol. 10, No. 2, Feb. 1973, pp. 93-98. Kaji, S. and Okazaki, T., "Propagation of Sound Waves through a Blade Row, II. Analysis Based on the Acceleration Potential Method," Journal of Sound and Vibration, Vol. 11, No. 3, March 1970, pp. 355-375. 3 Bland, S. R., "The...

Supersonic commercial aircraft noise predictions have frequently considered only exhaust noise from the jet engines. Meeting the stringent noise requirements that apply to the subsonic fleet will require reducing jet exhaust noise to the point that fan noise may also require reduction. This report discusses the prediction of fan noise for a supersonic commercial aircraft using existing empirica...

SUMMARY Brief consideration of current approaches to the prediction of unsteady wing loading in mixed subsonic and supersonic flow shows a wide variety of method and a clear need for economy in transonic aerodynamic calculations for flutter clearance in subsonic flight. In support of measurements of steady and oscillatory pressure distributions on a particular wing, an approximate theoretical t...

-Hh1s paper reports recent progress 1n vortex-control applications for alleviating the adverse consequences of three-dimensional separation and vortical Interactions on slender body/swept wing configurations. Examples Include: helical separation trip to alleviate the side force due to forebody vortex asymmetry; hinged strakes to avoid vortex breakdown effects; compartmentatlon ... swept leading...