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Thermo-acoustic instability in the horizontal Rijke tube |
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| Authors: | Woo-Seog Song Seungbae Lee Dong-Shin Shin Yang Na |
| Affiliation: | 1. Department of Mechanical Engineering, College of Engineering, Inha University, 402-751, Incheon, Korea 2. Department of Mechanical System Desighn Engineering, College of Engineering, Hongik University, 121-791, Seoul, Korea 3. CAESIT, Department of Mechanical Engineering, Konkuk University, 143-701, Seoul, Korea |
| Abstract: | The instability curve of a Rijke tube system was obtained accurately by following different paths of heat power and flow-rate for three regions and by defining its locus from the criterion based on the measured sound pressure levels. The unstable limits in the region of flow-rate lower than that at the minimal power are compared with previous data. To observe the effect of turbulence on the unstable limits, inflow turbulence was introduced by placing a bundle of circular cylinders upstream of the heating part (50< Red< 700). The large-amplitude inflow fluctuation may delay the transition of the chamber acoustic mode to the unstable zone even at a sufficient power. |
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