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Titolo:
THE RESPONSE OF ARTIFICIAL LONGITUDINAL VORTEX PAIR EMBEDDED IN THE BOUNDARY-LAYER TO ACOUSTIC EXCITATION
Autore:
KOHAMA Y; FUKUNISHI Y; WANG TJ;
Indirizzi:
TOHOKU UNIV,DEPT MACHINE INTELLIGENCE & SYST ENGN,ARAMAKI AOBA,AOBA KU SENDAI MIYAGI 980 JAPAN TOHOKU UNIV,GRAD SCH,INST FLUID SCI,AOBA KU SENDAI MIYAGI 980 JAPAN
Titolo Testata:
JSME international journal. Series B, fluids and thermal engineering
fascicolo: 1, volume: 36, anno: 1993,
pagine: 74 - 79
SICI:
1340-8054(1993)36:1<74:TROALV>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
TRANSITION PROCESS; SPIRAL VORTICES;
Keywords:
TRANSITION PREDICTION MECHANISM; ONSTET CONDITION; 3-DIMENSIONAL BOUNDARY LAYER; BOUNDARY LAYER CONTROL;
Tipo documento:
Article
Natura:
Periodico
Citazioni:
10
Recensione:
Indirizzi per estratti:
Citazione:
Y. Kohama et al., "THE RESPONSE OF ARTIFICIAL LONGITUDINAL VORTEX PAIR EMBEDDED IN THE BOUNDARY-LAYER TO ACOUSTIC EXCITATION", JSME international journal. Series B, fluids and thermal engineering, 36(1), 1993, pp. 74-79

Abstract

As a flow model for so-called ''secondary instability'' in a three-dimensional boundary layer, a flat plate boundary layer with artificially generated embedded streamwise vortices embedded in it is examined using a hot-wire anemometer and flow visualization in order to determinethe onset conditions of the secondary instabiliy and its response to acoustic excitation. The results show that the nondimensional parameter, with which the onset conditions of the secondary instability can bepredicted, is the product of critical inflection point height and inverse of maximum shear at critical conditions. Transition seems to start when this value reaches about 0.2. Acoustic disturbance seems to excite the secondary instability at certain conditions. Direct response to the disturbance frequency was observed within a frequency range of 290 Hz-450 Hz. Below 280 Hz, the spectral peak of velocity fluctuation was held constant at 345 Hz.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/09/20 alle ore 15:13:58