국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Measurements of Unsteady Pressure Distributions and Dynamic Deformations on an SST Elastic Arrow-Wing Model
저자	Masato TAMAYAMA, Kenichi SAITOH, Hiroshi MATSUSHITA, Masataka HASHIDATE, Jiro NAKAMICHI
Keyword	Unsteady Aerodynamics; Aeroelasticity; Transonic Flow; SST
URL	http://send.nal.go.jp/send/jpn/dlpdf.php3/naltr0001387t.pdf?id=NALTR0001387T
보고서번호	NAL TR-1387T
발행년도	1999.06
출처	NAL (National Aerospace Laboratory of Japan)
ABSTRACT	Unsteady pressure distributions were measured in a series of experiments in the transonic regime for a double-swept-back semi-span SST arrow wing model. The wing is an elastic model, the first natural frequency is 9.79 Hz. Forty-six unsteady pressure transducers and 45 pressure orifices were embedded at two semi-span stations to measure unsteady and steady pressure distributions respectively. The influence of temperature drifts in the wind tunnel could be effectively removed from the pressure transducer signal by timely taking of zero-balance. As a result, the gain of amplifiers was able to be raised, and then high S/N ratio achieved. Dynamic deformation data of the wing model were also measured, using optical targets and CCD cameras. The flow field around the model was excited by a trailing edge flap which was oscillated around a mean deflection angle in the frequency range up to 30 Hz. The model vibration mode changed at the flap frequency near the model 1st resonance. The unsteady pressure distributions were affected by this change of vibration mode. Unsteady lift and moment coefficients were derived from unsteady pressure distributions. Of particular role is the fact that while the unsteady aerodynamic coefficients were affected strongly by the flap motion at the inboard wing section, they were influenced by the wing vibration at the outboard wing section.