Fiber-coupled high-speed OH-PLIF imaging in turbulent flames Conference Paper uri icon

abstract

  • A fiber-coupled, ultraviolet, planar laser-induced-fluorescence (UV-PLIF) system operating at 10-kHz repetition rate is developed and demonstrated for probing hydroxyl radicals (OH) in turbulent flames. A 283-nm, nanosecond-duration laser is used to excite the (1,0) band of the OH A-X system, and the subsequent fluorescence from the (0,0) and (1,1) bands are detected. The system is designed to transmit the required excitation pulse energy through a 6-m-long optical fiber to enable OH-PLIF measurements. Single-laser-shot PLIF images at 10 kHz are obtained for visualizing OH distribution in pulsating turbulent flames. It is experimentally demonstrated that by utilizing a long multimode fiber, a non-uniform input-beam profile can be transformed to a desired, nearly Gaussian beam profile for PLIF imaging. The current results show significant promise for extending fiber-coupled highspeed UV-PLIF diagnostics to harsh environments such as those associated with combustors and gas-turbine-engine test facilities. © 2012 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

author list (cited authors)

  • Hsu, P. S., Kulatilaka, W. D., Jiang, N., Kostka, S., Roy, S., Patnaik, A. K., & Gord, J. R.

publication date

  • December 2012