국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	An Aerodynamic Design Method for Generating Low Sonic-Boom Pressure Signatures
저자	Yoshikazu MAKINO, Takashi AOYAMA, Toshiyuki IWAMIYA, Tadaharu WATANUKI, Hirotoshi KUBOTA
Keyword	Supersonic Transport; Sonic-Boom; Low sonic-boom Design; CFD Design; Optimization
URL	http://send.nal.go.jp/send/jpn/dlpdf.php3/naltr0001406.pdf?id=NALTR0001406
보고서번호	NAL TR-1406
발행년도	2000.02
출처	NAL (National Aerospace Laboratory of Japan)
ABSTRACT	A study was conducted of an aerodynamic design for the sonic-boom reduction of supersonic transport. Sonic-boom is one of the most important environmental problems for supersonic transport and many methods for the reduction of sonic-boom intensity have been published. These previous low sonic-boom design methods utilize the F-function method which is based on a linear theory. In comparison a new low sonic-boom design method is proposed in this study in order to deal with the nonlinear effects of the strong shocks near the aircraft and the three-dimensional effects of the aircraft configuration unable to be taken into accont in the F-function method. This new low sonic-boom design method combines a three-dimensional Euler CFD code with a least-square optimization technique. The aircraft fuselage geometry is modified by this method in order to minimize the pressure differences between a pressure signature calculated by the CFD and a target low sonic-boom pressure signature produced in the near-field below the aircraft. This target near-field pressure signature is determined from the target low sonic-boom ground signature by utilizing the waveform parameter method. We shall demonstrate here that the sonic-boom intensity of the low sonic-boom aircraft configuration designed by the F-function method is reduced by this new low sonic-boom design method