Abstract
A flow resonance accompanied by the emission of acoustic tones occurs in an over-expanded convergent-divergent (C-D) nozzle when operated at comparatively low pressure ratios. This phenomenon is distinguished from conventional screech tones and is referred to as “transonic tones”. In contrast to screech tones, the peak resonant frequency for transonic tones increases with pressure ratio; the peak sound pressure level exceeds 110 dB. In this study, we investigated the basic characteristics of transonic resonance and tones using a circular C-D nozzle in an anechoic room. The effects of the boundary layer trip were also evaluated using a tripping wire for the suppressing transonic resonance and tones. The results of acoustic measurements show that several predominant peaks correspond to transonic tones. However, the boundary layer trip inside the nozzle effectively eliminated these tones and suppressed the unsteadiness of the flow inside the nozzle.
| Original language | English |
|---|---|
| Pages (from-to) | 448-452 |
| Number of pages | 5 |
| Journal | Journal of Thermal Science |
| Volume | 26 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - Oct 1 2017 |
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All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
Cite this
Effect of boundary layer trip on reduction of jet noise in over-expanded nozzle flow. / Anyoji, Masayuki; Tabaru, Issei.
In: Journal of Thermal Science, Vol. 26, No. 5, 01.10.2017, p. 448-452.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effect of boundary layer trip on reduction of jet noise in over-expanded nozzle flow
AU - Anyoji, Masayuki
AU - Tabaru, Issei
PY - 2017/10/1
Y1 - 2017/10/1
N2 - A flow resonance accompanied by the emission of acoustic tones occurs in an over-expanded convergent-divergent (C-D) nozzle when operated at comparatively low pressure ratios. This phenomenon is distinguished from conventional screech tones and is referred to as “transonic tones”. In contrast to screech tones, the peak resonant frequency for transonic tones increases with pressure ratio; the peak sound pressure level exceeds 110 dB. In this study, we investigated the basic characteristics of transonic resonance and tones using a circular C-D nozzle in an anechoic room. The effects of the boundary layer trip were also evaluated using a tripping wire for the suppressing transonic resonance and tones. The results of acoustic measurements show that several predominant peaks correspond to transonic tones. However, the boundary layer trip inside the nozzle effectively eliminated these tones and suppressed the unsteadiness of the flow inside the nozzle.
AB - A flow resonance accompanied by the emission of acoustic tones occurs in an over-expanded convergent-divergent (C-D) nozzle when operated at comparatively low pressure ratios. This phenomenon is distinguished from conventional screech tones and is referred to as “transonic tones”. In contrast to screech tones, the peak resonant frequency for transonic tones increases with pressure ratio; the peak sound pressure level exceeds 110 dB. In this study, we investigated the basic characteristics of transonic resonance and tones using a circular C-D nozzle in an anechoic room. The effects of the boundary layer trip were also evaluated using a tripping wire for the suppressing transonic resonance and tones. The results of acoustic measurements show that several predominant peaks correspond to transonic tones. However, the boundary layer trip inside the nozzle effectively eliminated these tones and suppressed the unsteadiness of the flow inside the nozzle.
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U2 - 10.1007/s11630-017-0960-5
DO - 10.1007/s11630-017-0960-5
M3 - Article
VL - 26
SP - 448
EP - 452
JO - Journal of Thermal Science
JF - Journal of Thermal Science
SN - 1003-2169
IS - 5
ER -