Investigation of MHD flow structure and fluctuations by potassium lineshape fitting
- Mississippi State Univ., MS (United States)
Multiple Potassium D-line emission absorption spectra from a high temperature, coal-fired flow have been fit to a radiative transfer, boundary layer flow model. The results of fitting spectra from the aerodynamic duct of the Department of Energy Coal-Fired Flow Facility provide information about the thickness and shape of the thermal boundary layer and the bulk potassium seed atom density in a simulated magnetohydrodynamic channel flow. Probability distribution functions for the entire set of more than six thousand spectra clearly indicate the typical values and magnitude of fluctuations for the flow: core temperature of 2538 {plus_minus} 20 K, near wall temperature of 1945 {plus_minus} 135 K, boundary layer width of about 1 cm, and potassium seed atom density of (5.1 {plus_minus} 0.8)x 10{sup 22}/m{sup 3}. Probability distribution functions for selected times during the eight hours of measurements indicate occasional periods of unstable combustion. In addition, broadband particle parameters during the unstable start of the test may be related to differing particle and gas temperatures. The results clearly demonstrate the ability of lineshape fitting to provide valuable data for diagnosing the high speed turbulent flow.
- DOE Contract Number:
- AC02-80ET15601
- OSTI ID:
- 273332
- Report Number(s):
- CONF-930626-; TRN: 96:003380-0043
- Resource Relation:
- Conference: 31. symposium on engineering aspects of magnetohydrodynamics, Whitefish, MT (United States), 29 Jun - 1 Jul 1993; Other Information: PBD: 1993; Related Information: Is Part Of Proceedings of the 31st symposium on engineering aspects of magnetohydrodynamics; PB: 570 p.
- Country of Publication:
- United States
- Language:
- English
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Potassium D-line fitting for investigation of MHD boundary layers
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