충돌면과 노즐의 형상이 원형충돌제트에 의한 충돌순음 발생에 미치는 영향Effect of Nozzle Configuration and Impinging Surface on the Impinging Tone Generation by Circular Jets
- Other Titles
- Effect of Nozzle Configuration and Impinging Surface on the Impinging Tone Generation by Circular Jets
- Authors
- 권영필; 임정빈
- Issue Date
- Jun-2003
- Publisher
- 대한기계학회
- Keywords
- Impinging Jet(충돌 제트); Circular Jet(원형 제트); Preferred Mode(선택적 모드); Convection Velocity(대류속도); Hole-Tone(홀톤); Impinging Jet(충돌 제트); Circular Jet(원형 제트); Preferred Mode(선택적 모드); Convection Velocity(대류속도); Hole-Tone(홀톤)
- Citation
- 대한기계학회논문집 B, v.27, no.6
- Journal Title
- 대한기계학회논문집 B
- Volume
- 27
- Number
- 6
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/20887
- ISSN
- 1226-4881
- Abstract
- The effect of the configuration of the nozzle and the impinging surface on the characteristics of the hole-tones has been experimentally investigated. It is found that the plate-tone is a special case of hole-tones, where the hole diameter is zero. The jet velocity range for hole-tones is divided into the low velocity region associated with laminar jet and the high velocity region with turbulent jet. The frequency of the tone is that for the shear layer instability at the nozzle exit or that attainable by a cascade of vortex pairing process with increase of the impinging distance. When the distance is longer than one diameter the frequency decreases to the terminal value near the preferred frequency of the column mode instability, in the range 0.23< Std<0.53, where Std is the Strouhal number defined by fd/Uj, f the frequency, d the nozzle diameter, and Uj the exit velocity. While the convection speed of the downstream vortex, in the present study, is almost constant at low-speed laminar jet, it increases with distance at high-speed turbulent jet. As the frequency increases, the convection speed decreases in the low frequency range corresponding to the preferred mode, in agreement with the existing experimental data for a free jet.
- Files in This Item
-
Go to Link
- Appears in
Collections - College of Engineering > Department of Mechanical Engineering > 1. Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.