서지주요정보
2차원 수중 초음속 제트의 가시화 및 불안정성 관찰 = Observation of instability and visualization of two dimensional supersonic submerged jets
서명 / 저자 2차원 수중 초음속 제트의 가시화 및 불안정성 관찰 = Observation of instability and visualization of two dimensional supersonic submerged jets / 정재권.
저자명 정재권 ; Jung, Jae-Kwon
발행사항 [대전 : 한국과학기술원, 2002].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8012831

소장위치/청구기호

학술문화관(문화관) 보존서고

MAE 02014

휴대폰 전송

도서상태

이용가능

대출가능

반납예정일

초록정보

An experimental investigation of the structure and dynamic behavior of two dimensional over-expanded air jets in water was conducted. To characterize the structure and time-dependant behavior of these jets, high speed digital video recording and static pressure distribution were obtained. Test conditions varied by setting different reservoir pressure. Shadowgraph of the over-expanded jet into ambient air confirmed approximate Mach number at the jet exit of 2.0 that was slightly less than the value predicted by the ideal design calculation. From the captured images, jet spreading angle was measured as a function of mass flow rate. At a mass flow rate less than 0.025kg/s, the spreading angle remained roughly constant. As mass flow rate increases beyond 0.025kg/s, the spreading angle increased with mass flow rate. Time dependant instability was estimated by examination of the sequence of the video images. Periodic nature of the jet shape was observed and the frequency of the repetition was approximately 5-6 for all cases tested. Three length scales that characterize the geometry of the instability of submerged jet were defined. These Three characteristic length scales were defined as following. $L_1$ is the maximum width of the plume when the periodic instability occurs, $L_2$ is the width of the jet where secondary reverse flow entrained jet flow and $L_3$ is the distance from the jet exit to the location where entrainment of the secondary reverse flow occurs. The ratio of $L_1$ and $L_2$ decreased with increasing stagnation pressure, i.e. mass flow rate. $L_3$ increased with increasing stagnation pressure. The temporal behavior of static pressure measurements also showed peak around frequency of 5, which corresponds the frequency obtained by visual measurements.

서지기타정보

서지기타정보
청구기호 {MAE 02014
형태사항 ix, 55 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Jae-Kwon Jung
지도교수의 한글표기 : 박승오
공동교수의 한글표기 : 권세진
지도교수의 영문표기 : Seung-O Park
공동교수의 영문표기 : Se-Jin Kwon
학위논문 학위논문(석사) - 한국과학기술원 : 항공우주공학전공,
서지주기 참고문헌 수록
주제 수중 초음속 제트
수중 제트 불안정성
supersonic submerged jets
instability of submerged jets
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