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联合技术研究中心(UTRC)正在进行一项碳氢燃料超燃冲压发动机(Ma=5.6～7)技术的试验研究计划,以制订出超燃冲压发动机燃烧室设计标准。该项计划还提出了新型吸气式预燃室,对它进行了试验并且评估了其火焰稳定和火焰传播特性。试验证明,这种预燃室可以促进气态乙烯或预加热的液态JP-5(作为初级燃料喷入超音速主气流中)有效地燃烧,用这种预燃室的想法和用初级、次级燃料喷嘴分级供应燃料可使燃料在一个很宽的范围内进行有效的超音速燃烧。在气态乙烯燃料的分级喷射试验中,可以实现次级燃料高效率的燃烧,并证明在高的总当量比下,可以从完全超音速燃烧平稳地过渡到双模式(超音速/亚音速)工作状态。业已证明,这种预燃室即使在双横式工作状态的高燃烧压力下,也可以有效地将进气道与燃烧过程隔离。
The United Technologies Research Center (UTRC) is conducting a pilot study on the technology of a HCF scramjet (Ma = 5.6-7) to develop a design standard for a scramjet engine combustor. The program also proposed a new aspirated pre-chamber, tested it and evaluated its flame stability and flame propagation characteristics. Experiments have shown that such pre-combustion chambers can promote the efficient combustion of gaseous ethylene or preheated liquid JP-5 (injected as a primary fuel into the supersonic main gas stream), using this idea of pre-chamber and the use of primary, secondary Fuel nozzles fueling stages provide efficient, supersonic combustion of the fuel over a wide range of pressures. In a staged jet test of gaseous ethylene fuel, efficient combustion of secondary fuel can be achieved and it is demonstrated that at high total equivalence ratios, a smooth transition from full supersonic combustion to dual mode (supersonic / subsonic) operation is possible status. It has been demonstrated that this pre-combustion chamber can effectively isolate the intake from the combustion process even under high combustion pressure in a double transverse working state.