국내 최대 기계 및 로봇 연구정보

공학설계D/B

공학설계D/B 게시판 내용
Volume Title	Transonic Aerodynamics
Volume No	Axisymmetric bodies: drag rise. Axisymmetric forebodies: wave drag, pressure distribution.
DATA Title	Pressure drag and lift contributions for blunted forebodies of fineness ratio 2.0 in transonic flow (M sub infinity less than or equal to 1.4).
DATA Item	89033
KEYWORD	axisymmetric, blunt, body, cone, distribution, drag, flow, force, forebody, ogive, optimisation, minimum, pressure, spherical, tangent, transonic, wave, optimization
ISBN	0 85679 850 9
ABSTRACT	ESDU 89033 presents axial and normal pressure force coefficient data obtained from a computed solution of the Euler equations for inviscid flow about spherically blunted tangent ogive and cone forebodies followed by a cylindrical afterbody in the Mach number range of 0.7 to 1.4. It is found that there is a an optimum blunting ratio (ratio of the blunted nose diameter to the afterbody diameter) for which for a given Mach number and angle of attack the axial pressure force is a minimum. Charts show the variation of axial and normal pressure force coefficients around the optimum blunting for angles of attack up to 10 degrees, and axial pressure force coefficient (which is equivalent to the wave drag) at zero incidence. The derivation of the results is discussed, and examples compare forebody pressure distributions and force coefficients with those obtained in wind-tunnel tests, so providing guidance on the expected accuracy of the calculations.