승용차 외장측면거울 주위 유동의 난류 특성

다국어 초록 (Multilingual Abstract)

In order to study turbulent structure of wake flow around the rear view side mirror of a passenger car, statistical and spectral measurements were conducted in a blow down wind tunnel with the Reynolds number of 2 × 10?. Moment property and turbulent energy in the mirror wake were measured by using hot wire anemometry and dynamic signal analyzer at 0.7d, 1.4d and 2.8d downstream (d is the height length of the mirror). Also, Laser Doppler Velocimetry was used to measure velocity in the recirculation zone behind the mirror. Mean velocity was accelerated behind tip region of the mirror housing and the recirculation zone was observed up to 1.2d downstream of the mirror. Also, peak values of fluctuation rms velocity appeared in the vicinity of the mirror wake due to remarkable vortex shedding. The corresponding skewness and flatness factor were significantly deviant from a Gaussian distribution. Spectra analysis showed that most of energy was concentrated in the low frequency and the magnitude of energy distribution was reduced with downstream. It was concluded that strong turbulent energy at the near wake was induced by considerable vortex shedding having a non-random characteristics, resulted in intermittent force around tip region of the mirror surface.

목차 (Table of Contents)

• Abstract
• 1. 서론
• 2. 실험 장치
• 3. 실험 결과 및 고찰
• 4. 결론
• 참고문헌