氢氧内燃机增氧定容燃烧特性研究

航天器携带推进剂有限，氢氧内燃机适宜采用纯氢纯氧+富氢燃烧方式，但目前内燃机纯氢纯氧燃烧缺乏地面试验验证。为此开展氢氧内燃机增氧定容燃烧试验，采用内燃机定容燃烧逐步增氧的技术路线，获得增氧乃至纯氧条件下氢氧内燃机的层流燃烧特性，实现氢氧内燃机高性能高可靠工作。试验结果表明：随着氧气浓度的增大，层流燃烧速度随当量比成倍增加，变化的幅度会逐渐减小；高氧气浓度条件下，层流燃烧速度维持在很高的水平，且随当量比的变化很小。

Study on Oxygen-Enhanced Constant Volume Combustion Characteristics of Hydrogen-Oxygen Internal Combustion Engine

Due to the limitation of the limited propellant carried by spacecraft, the hydrogen-oxygen internal combustion engine(HO ICE) for aerospace is suitable for pure hydrogen, pure oxygen and hydrogen-rich combustion, but lack of ground test validation . In order to realize the high-performance and reliable engines, it is particularly important to study the combustion characteristics of HO ICE. It adopts the methods of oxygen-enhanced and constant volume combustion to obtain HO ICE laminar combustion characteristics. The experiment result indicate: as the concentration of oxygen increases, laminar burning speed increases exponentially with equivalent ratio, but the increasing scale of burning speed will gradually decrease with equivalent ratio. Under the condition of high oxygen concentration, laminar burning speed is maintained at a very high level, and changes little with equivalent ratio.