Flame Structure and Dynamics in a Premixed Dual-Mode Scramjet Combustor from Fluorescence Imaging

被引:7
|
作者
Allison, Patton M. [1 ]
Frederickson, Kraig [1 ]
Kirik, Justin W. [2 ]
Rockwell, Robert D. [2 ]
Goyne, Christopher P. [2 ]
Lempert, Walter R. [1 ]
Sutton, Jeffrey A. [1 ]
机构
[1] Ohio State Univ, Mech & Aerosp Engn, Columbus, OH 43210 USA
[2] Univ Virginia, Mech & Aerosp Engn, Charlottesville, VA 22904 USA
关键词
PULSE-BURST LASER; SUPERSONIC COMBUSTION; SPECTROSCOPY; VISUALIZATION; HYDROCARBONS; FORMALDEHYDE; IGNITION;
D O I
10.2514/1.B37057
中图分类号
V [航空、航天];
学科分类号
08 ; 0825 ;
摘要
Formaldehyde (CH2O) planar laser- induced fluorescence (PLIF) imaging was performed in a premixed, ethylenefueled dual- mode scramjet combustor to study the flame structure and dynamic flame behavior. CH2OPLIF is used as a marker to provide information on the structure and position of the lower-temperature portion of the reaction zone. Low-repetition-rate (10 Hz) measurements were acquired at several cross-flow planes along the axial flow direction. Statistical analysis of the CH2O topology indicates sparse concentrations of formaldehyde that are intermittently detected by the PLIF measurement. Comparisons between previous large-eddy simulations, laboratory-scale flames, and the current experimental measurements indicate discrepancies between the expected and measured formaldehyde concentrations and structure. High-speed formaldehyde PLIF also was conducted at 50 kHz to further investigate the intermittency of the formaldehyde layers in the flow.
引用
收藏
页码:552 / 564
页数:13
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