Affiliation:
1. Zhejiang University
2. Aero Engine Corp China
Abstract
Abstract
Low temperature and low air pressure would cause low fuel inlet temperature and low air flowrate in aero-engine combustion chamber working in the upper atmosphere. A system including a burner normally used in actual aero engines is established to study swirl-stabilized kerosene spray combustion at conditions of low fuel inlet temperature (T < − 16 ℃) and low air pressure. According to analysis of OH-PLIF images, sub-zero Celsius significantly results in the reduction of the OH radical concentration and poor heat release rate. The strongest signals decrease by at least 5 times. With analysis of LIF spectroscopy and detuned images, fuel LIF particles in the OH-PLIF images are mainly liquid kerosene LIF. The LIF signals of flame structure are almost all from OH radicals. Using LOG operator blob detection, it is found that, when at sub-zero Celsius, the total number of fuel LIF particles slightly decreases and the number of large particles increases at any air pressure. PLIF analysis in this study provides insight into complex combustion deterioration of kerosene swirling spray combustion for the first time.
Publisher
Research Square Platform LLC
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