原文传递
Acoustic damping of a pipeline cavity system
| 题名： | Acoustic damping of a pipeline cavity system |
| 作者： | Reiss, M.; |
| 关键词： | 42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; DAMPING; PIPES; COMPARATIVE EVALUATIONS; CAVITIES; ACOUSTICS; TURBULENT FLOW; EXPERIMENTAL DATA; MECHANICAL VIBRATIONS |
| 摘要： | This investigation addresses the acoustic damping of an open-ended pipeline-cavity system from both theoretical and experimental perspectives. Characterization of the damping involves the quality (Q) factor. Theoretical predictions of Q-factors were derived from first principles for the case of a pipe without a cavity or flow. Equations are provided for the most general case, as well as for limiting cases, using dimensionless representations of viscosity, frequency, wave number and pipe size. These predictions are compared with experimental data to determine the effects of: (1) mean flow; (2) presence of a cavity; and (3) lengths of the pipe segments upstream and downstream of the cavity. Experimental data were acquired using high sensitivity pressure transducers interfaced with a computer incorporating an advanced version of an on-line data acquisition system. For cases without mean flow, the experimental data show values of Q-factors generally lower than theoretical predictions. The presence of mean flow results in a further increase in damping of the system. These findings provide a basis for future flow-tone investigations. |
| 总页数： | 91p |
| 报告类型： | 科技报告 |
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