Simultaneous Temperature, Species and Velocity Measurements via Combined Raman Spectroscopy and HTV

Shengteng Hu, David Mosbacher, Joseph Wehrmeyer, Robert Pitz
2004 40th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit   unpublished
Non-intrusive molecular flow tagging methods, such as Hydroxyl Tagging Velocimetry (HTV), have shown the capability of providing quantitative velocity information in both room temperature and flames. Benefiting from the instantaneous nature of HTV and the feasibility of single-pulse measurements of Raman scattering with an UV excimer laser, simultaneous velocity, temperature and major species measurements can be realized. In the present work, these non-intrusive diagnostics methods are used to
more » ... ethods are used to obtain quantitative measurements in a lifted, turbulent hydrogen jet diffusion flame . A narrowband KrF excimer laser tuned to 248.634 nm is used to measure major species concentrations (H 2 , O 2 , N 2 and H 2 O) and temperature is determined by invoking the ideal gas law. After the firing of the KrF excimer laser, a 7 x 7 OH grid is generated via single-photon photodissociation of H 2 O by a ~193 nm ArF excimer laser. A "read" laser sheet from a pulsed frequency-doubled dye laser operating at 281.997 is then used to reveal the grid through fluorescence caused by A 2 ? + (v? = 1) ? X 2 ? i (v? = 0) pumping. Two consecutive images, of a known time delay, are acquired to calculate the velocity field * through a time-of-flight method.
doi:10.2514/6.2004-4167 fatcat:zc3zxp6e6vb4bjnmcf7o7ya5pe