서지주요정보
LDV를 이용한 확대 축소연결관내의 자기상관 함수의 측정 및 난류구조에 관한 연구 = Experimental study on autocorrelation function using LDV and the turbulence flow field in a sudden expansion and contraction joint
서명 / 저자 LDV를 이용한 확대 축소연결관내의 자기상관 함수의 측정 및 난류구조에 관한 연구 = Experimental study on autocorrelation function using LDV and the turbulence flow field in a sudden expansion and contraction joint / 이도환.
저자명 이도환 ; Lee, Do-Hwan
발행사항 [대전 : 한국과학기술원, 1990].
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소장정보

등록번호

8000725

소장위치/청구기호

학술문화관(문화관) 보존서고

MME 9039

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초록정보

The present thesis has been carried out to investigate a data processing method to obtain statistical correlations and spectra of turbulent flow field using randomly bursted data from the counter type LDV processor. The raw signal from the LDV counter processor varies discontinuously stepwise with random duration, and only the data points at the instance of each step burst, or the starting point of each step represent the correct instantaneous velocities. In this study, the autocorrelation function $R_{uu}(\tau)$ was numerically calculated by using such valid data set only and then the power spectrum was obtained by taking the Fourier transform of the resultant correlation. In order to verify the present method, the correlation function and spectrum were compared with those obtained by the hot-wire anemometer signals. The correlation function by the LDV signal remains positive, whereas that of the hot-wire signals becomes negative for large $\tau$. And the power spectrum based on the LDV signal shows slightly higher energy constant in high frequency range compared with that of hot-wire signals. This implies that the data rate is not large enough so that the aliasing problem arises. In order to overcome such aliasing problem, Buchhave's weighting is required in the calculation procedure of the correlation function.

서지기타정보

서지기타정보
청구기호 {MME 9039
형태사항 vi, 48 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Do-Hwan Lee
지도교수의 한글표기 : 정명균
지도교수의 영문표기 : Myung-Kyoon Chung
학위논문 학위논문(석사) - 한국과학기술원 : 기계공학과,
서지주기 참고문헌 : p. 21-24
주제 Turbulence.
Autocorrelation (Statistics)
Fourier transformations.
LDV. --과학기술용어시소러스
난류 (수력) --과학기술용어시소러스
팽창 유동. --과학기술용어시소러스
관내류. --과학기술용어시소러스
자기 상관 함수. --과학기술용어시소러스
파워 스펙트럼. --과학기술용어시소러스
Laser doppler velocimeter.
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