Flow field and scalar measurements in a series of turbulent partially-premixed dimethyl ether/air jet flames [electronic resource]

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Tác giả:

Ngôn ngữ: eng

Ký hiệu phân loại: 629.12 Aerospace vehicles and stationary facilities

Thông tin xuất bản: Washington, D.C. : Oak Ridge, Tenn. : United States. Dept. of Energy. Office of Science ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2017

Mô tả vật lý: Size: p. 40-52 : , digital, PDF file.

Bộ sưu tập: Metadata

ID: 266643

 Here, we present a series of benchmark flames consisting of six partially-premixed piloted dimethyl ether (DME)/air jet flames. These flames provide an opportunity to understand turbulence-flame interactions for oxygenated fuels and to develop predictive models for these interactions using a canonical burner geometry. The development of accurate models for DME/air flames would establish a foundation for studies of more complex oxygenated fuels. The flames are stabilized on a piloted jet burner similar to that of the partially-premixed methane/air jet flames that have been studied extensively within the context of the TNF Workshop. This series of six jet flames spans jet exit Reynolds numbers, <
 i>
 Re<
 sub>
 D<
 /sub>
 <
 /i>
 , from 29,300 to 73,300 and stoichiometric mixture fractions, ?<
 sub>
 st<
 /sub>
 , from 0.35 to 0.60. Flame conditions range from very low probability of localized extinction to a high probability of localized extinction and subsequent re-ignition. Measurements in the flames are compared at downstream locations from 5 to 25 diameters above the nozzle exit. Mean and fluctuating velocity components are measured using stereo particle image velocimetry (SPIV). Simultaneous laser-induced fluorescence (LIF) imaging of OH and CH<
 sub>
 2<
 /sub>
 O provides insights into the distribution of these intermediate species in partially-premixed DME/air flames. OH LIF imaging is also combined with SPIV to investigate the strain rate field across the reaction zone.
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