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Laser doppler velocimeter system simulation for sensing aircraft wake vortices
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Thomson, J. A. L. Meng, J. C. S. |
| Copyright Year | 1974 |
| Description | A hydrodynamic model of aircraft vortex wakes in an irregular wind shear field near the ground is developed and used as a basis for modeling the characteristics of a laser Doppler detection and vortex location system. The trailing vortex sheet and the wind shear are represented by discrete free vortices distributed over a two-dimensional grid. The time dependent hydrodynamic equations are solved by direct numerical integration in the Boussinesq approximation. The ground boundary is simulated by images, and fast Fourier Transform techniques are used to evaluate the vorticity stream function. The atmospheric turbulence was simulated by constructing specific realizations at time equal to zero, assuming that Kolmogoroff's law applies, and that the dissipation rate is constant throughout the flow field. The response of a simulated laser Doppler velocimeter is analyzed by simulating the signal return from the flow field as sensed by a simulation of the optical/electronic system. |
| File Size | 3278713 |
| Page Count | 113 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19750010193 |
| Archival Resource Key | ark:/13960/t6159c553 |
| Language | English |
| Publisher Date | 1974-12-01 |
| Access Restriction | Open |
| Subject Keyword | Research And Support Facilities (air) Flow Equations Numerical Analysis Turbulent Wakes Laser Doppler Velocimeters Vortices Flow Measurement Aircraft Wakes Data Processing Signal Reception Flow Characteristics Test Equipment 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 |
