关键词: 航空发动机;煤油;射流;超声速燃烧

Abstract: The characteristics of jet structure of kerosene injection into quiescent atmosphere and Mach 2.5 crossflow at various preheat temperature were investigated experimentally by using direct photo and schlieren visualization. A heating system was designed and tested that can prepare heated kerosene of 0.8kg up to 670K at a pressure of 5.5MPa. Comparison of kerosene jet structure in the preheat temperature range of 290K~550K demonstrated that with injection pressure 4MPa the jet plume turns into vapor phase completely at injection temperature of 550K, while keeping the penetration depth essentially unchanged. The results suggest that the injection of vaporized fuel would improve the performance of a liquid hydrocarbon-fueled supersonic combustor because the evaporation process is now omitted.

Key words: Aircraft engine;Kerosene;Jet flow;Supersonic combustion