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Sound radiation due to boundary layer transition
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Wang, Meng |
| Copyright Year | 1993 |
| Description | This report describes progress made to date towards calculations of noise produced by the laminar-turbulence transition process in a low Mach number boundary layer formed on a rigid wall. The primary objectives of the study are to elucidate the physical mechanisms by which acoustic waves are generated, to clarify the roles of the fluctuating Reynolds stress and the viscous stress in the presence of a solid surface, and to determine the relative efficiency as a noise source of the various transition stages. In particular, we will examine the acoustic characteristics and directivity associated with three-dimensional instability waves, the detached high-shear layer, and turbulent spots following a laminar breakdown. Additionally, attention will be paid to the unsteady surface pressures during the transition, which provide a source of flow noise as well as a forcing function for wall vibration in both aeronautical and marine applications. |
| File Size | 674457 |
| Page Count | 14 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19940019690 |
| Archival Resource Key | ark:/13960/t7xm37d0q |
| Language | English |
| Publisher Date | 1993-12-01 |
| Access Restriction | Open |
| Subject Keyword | Acoustics Viscosity Turbulence Lighthill Gas Model Aerodynamic Noise Transition Flow Unsteady Flow Pressure Directivity Shear Layers Reynolds Stress Three Dimensional Flow Boundary Layer Transition Boundary Layer Stability Aeroacoustics Boundary Layers Compressible Flow Mach Number Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
