| 摘要 |
<p>A flow field seeded with elements is illuminated by a shaped light beam (5) introduced into the optical axis (20) of a video detector (21) by a polarising beam-splitter (10). The laser is pulsed and (21) records multiple element scattering images, after going through a lens (8). Images are then processed to extract the velocity field and/or aerosol characteristics. To measure of viscosity, pressure, density, and velocity, three seeding populations of varying size are used to derive a set of simultaneous equations, together with the perfect-gas law. Furthermore, the remaining portion of the light beam not striking any seeding can be used, in conjunction with parameter-sensing paints, to record back-surface temperature/pressure, or PSP/TSP data can be recorded of luminescence created by an external excitation source. This apparatus is capable of providing real-time, 3D aerodynamic together with back-surface heat transfer/pressure information, simultaneously through a single integrated modular measurement means.</p> |
