A molecular-filter-based flow diagnostic technique termed filtered angularly resolved Raleigh scattering is used to measure velocity, density, and temperature simultaneously. The technique uses an anamorphic optical system to record the Rayleigh scattered signal viewed at different angles and focused onto an intensified charge-coupled device camera. The experimentally obtained intensity vs viewing angle profiles are then combined with a well-known computational model to solve for the velocity, density, and temperature. The technique was used in a supersonic axisymmetric jet operated at a variety of flow conditions from Mach 1 to 2.3. The measured velocity and thermodynamic properties are compared with the theoretical values in the core of the jet. The measured values are within 11% for the velocity and 7% for the other thermodynamic properties. The error levels agree with the level of uncertainty that is calculated for the system. Methods of reducing the uncertainty and improving the technique also are discussed.
ASJC Scopus subject areas
- Aerospace Engineering