关键词: 煤油;超音速燃烧;高温气体;引导火焰+;数值仿真

Abstract: A numerical study was conducted for the supersonic combustion of premixed kerosene-air flow ignited by a high-temperature hot gas as the pilot flame. Many factors, which have important influences on supersonic combustion, were systematically explored. These factors include the temperature, pressure, equivalence ratio of the supersonic premixed flow, and the pressure matching relations between the premixed flow and the hot gas. The results show that with the rise of the static temperature or the static pressure of the premixed flow, the compression wave induced by ignition intensifies, resulting in an increased highest temperature and an expanded flame-spreading angle. When the equivalence ratio of the premixed flow is exactly stoichiometric, the combustion temperature reaches the highest. When the static pressure of the premixed flow is higher than that of the hot gas, the ignition distance is shorten, compared with the static pressures matched cases. On the contrary, when the latter is higher than the former, the ignition distance is prolonged. Moreover, the flame-spreading angle is larger in the non-matched cases than that of the matched case. Besides, auto-ignition occurs in the boundary layer at the lower wall in many cases.

Key words: Kerosene;Supersonic combustion;High temperature gas;Pilot flame~+;Numerical simulation