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| Studying of Mach wave radiation in an axisymmetric supersonic jet using nonlinear disturbance equations |
| Received:September 29, 2015 Revised:February 22, 2016 |
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| DOI：10.7511/jslx201702013 |
| KeyWord:nonlinear disturbance equations linear stability supersonic jet instability waves Mach wave radiation |
| Author | Institution |
| 郭娜 |
天津大学 机械工程学院 力学系 天津 |
| 方一红 |
天津大学 机械工程学院 力学系 天津 |
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| Abstract: |
| Theoretical investigations have described the growth and decay of instability waves that give rise to Mach wave radiation. In present work, the intense Mach wave radiation by the linear instability waves of a perfectly expanded, axisymmetric jet with an initial centerline Mach number of Ma=2. 1 are computed by solving nonlinear disturbance equations. Using linear stability theory, we demonstrate that it is essential to properly address the source of Mach wave radiation. It is also shown that, in supersonic axisymmetric jet, the radiated Mach waves are most intensive in a fixed direction which is perpendicular to the Mach wave front. The intense and location of Mach waves radiation emitter are changed with St numbers. All of our results are in good agreement with direct computations and theoretical analysis. |