서지주요정보
국소 교란이 난류 경계층에 미치는 영향 = Effect of local forcing on a turbulent boundary layer
서명 / 저자 국소 교란이 난류 경계층에 미치는 영향 = Effect of local forcing on a turbulent boundary layer / 박상현.
저자명 박상현 ; Park, Sang-Hyun
발행사항 [대전 : 한국과학기술원, 1999].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8009508

소장위치/청구기호

학술문화관(문화관) 보존서고

MME 99025

SMS전송

도서상태

이용가능

대출가능

반납예정일

초록정보

An experimental study was made of flow structures behind a local suction and blowing in a flat plate turbulent boundary layer. Local forcing was given to boundary layer flow by means of sinusoidally oscillating jet issuing from a thin spanwise slit at wall. The Reynolds number based on the momentum thickness is Reθ = 1700. Effect of local forcing on the flow structure was scrutinized by altering the forcing frequency ($0.0027 ≤ f^+ ≤ 0.0162$) and $A_0$=0.2. Small local forcing decreased the skin friction coefficient and increase the displacement thickness. A phase average technique was employed to capture the coherent structures due to the local periodic forcing. The turbulent flow characteristics were decomposed into a periodic part and a random part. It is shown that an organized spanwise vortical structure is generated by the local forcing. Relatively larger vortical structures were made by the lower frequency of local forcing, where the turbulent energy is concentrated at the core of the vortical structure.

서지기타정보

서지기타정보
청구기호 {MME 99025
형태사항 iv, 60 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Sang-Hyun Park
지도교수의 한글표기 : 성형진
지도교수의 영문표기 : Hyung-Jin Sung
학위논문 학위논문(석사) - 한국과학기술원 : 기계공학과,
서지주기 참고문헌 : p. 57-60
주제 국소 교란
주기적 흡입과 분사
난류 경계층
표면 마찰
횡방향 와류 구조
Local forcing
Periodic suction and blowing
Turbulent boundary layer
Skin friction
Spanwise vortex structure
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