A Study on Fundamental Aerodynamic Characteristics of Future Space Transportation Systems

48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

Tani³

2010

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The numerical simulations and analyses based on experimental results were carried out by means of computational fluid dynamics. Before now, many experimental and numerical approaches have been conducted for the model whose cross sectional configuration of the fuselage is an isosceles right triangle. It has high lift at high angle of attacks. With these results, new configurations were created to enhance the aerodynamic characteristics and it was obtained that a lift coefficient is increased. The reasons of its increment are analyzed and they are related to the strength of separation vortex and its position. Also, drag coefficients and pitching moment coefficients are discussed in this paper. Nomenclaturelift to drag ratio L/D max = maximum lift to drag ratio C p = pressure coefficient Re = Reynolds number based on overall length of the model α = Angle of attack (Incident angle) S ref = reference area (in this paper, equal to projected area) L ref = reference length (in this paper, equal to overall length of the model) x = position on body axis in x direction (origin is model apex) M = mach number s = distance from the apex of Apollo Command Module model measured along the surface r = radius of Apollo Command Module model at maximum diameter λ = angle of arbitrary plane relative to pitch plane for Apollo Command Module

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Section: Introductionmentioning

confidence: 99%

A Proposal of New Fuselage Configurations for Realizing Reusable Launch Vehicles

48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

Tani³

2010

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“…In previous studies, RLV configuration which has an isosceles-right triangle cross sectional sharp for fuselage has good C L and L/D from subsonic to supersonic regions compared to square fuselage cross sectional configuration. [1][2][3][4][5][6][7][8] The objective of this study is to investigate effects of cross sectional configurations on aerodynamic characteristics in supersonic region numerically. Also, analysis of the flow field is included in this objective.…”

Section: Introductionmentioning

confidence: 99%

A Study of Fuselage Configurations for Reusable Launch Vehicles

47th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

Tani

et al. 2009

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A numerical study on the fuselage configurations of reusable launch vehicles (RLVs) has been conducted. The models for the numerical simulations were the models which wind tunnel experiments were conducted previously (named in this paper as triangle and square) and a new proposal one which modified the cross sectional configuration. (named as modified triangle) The results from triangle and square models showed that in supersonic region, the formations of separated vortex on the fuselage surfaces are quite different from subsonic case. With the results from modified triangle model, it is obvious that changing the separation lines has the effect to enlarge the region which separated vortex develops. Nomenclature α = Angle of Attack (Incident Angle) C L = Lift Coefficient C D = Drag Coefficient L/D = Lift-to-Drag Ratio M = Mach Number S ref = Reference Area (Projection Area of the models)

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Experimental study of fuselage effects on the aerodynamic performances of reusable launch vehicle (rlv)

57th International Astronautical Congress

Tani

et al. 2006