Laser Doppler velocity measurements at the CFFF secondary combustor
Conference
·
OSTI ID:254660
- Univ. of Tennessee Space Institute, Tullahoma, TN (United States)
- Mississippi State Univ., MS (United States)
NO{sub x} control strategy at the U.S. Department of Energy Coal Fired Flow Facility (CFFF) is based on fuel rich primary combustion for the MHD topping cycle, with secondary combustion of the fuel rich exhaust gases upstream of the super-heater sections. This strategy depends on appropriate mixing in the secondary combustor and to examine this mixing laser Doppler velocimeter (LDV) measurements were made immediately below (ie., downstream) of the CFFF secondary combustor. These measurements were taken in a cooperative research effort between ECP and DIAL personnel during a July 1993 test series (LMF5-I). Mean velocity and turbulence profiles were obtained along the north-south symmetry line of the secondary combustor exhaust flow. These mean and turbulent velocity profiles compare favorably with previously obtained cold flow model data. However, power spectra of single point gas velocities used to evaluate low frequency oscillatory flow from the combustor, show little evidence of oscillations as seen with the cold flow model. Centerline velocity variations with seed flow were also measured and indicate only small effects of seed injection rate on the mean velocity and the turbulence levels. In addition, an experimental PC add-in-board LDV data processor was used simultaneously with the commercial processors to examine relative capabilities of the add-in-board processor. Simultaneous measurements obtained by the two processors measuring the same backscatter LDV signal agreed well.
- OSTI ID:
- 254660
- Report Number(s):
- CONF-950697--
- Country of Publication:
- United States
- Language:
- English
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