含碳偏二甲肼的点火和燃烧特性

Ignition and Combustion Characteristics of UDMH Containing Carbon

添加碳粉是提高推进剂能量密度的途径之一.为了获得含碳偏二甲肼UDMH的点火特性和高效燃烧室设计方法,设计了撞击式喷注器液体火箭发动机燃烧室,通过实验手段,研究了含碳UDMH的燃烧特性、燃烧室特征长度对燃烧效率的影响以及冷却特性.结果表明,含碳UDMH燃烧室的起动、关机和脉冲性能与液体推进剂相当;在UDMH中添加碳元素将导致推进剂密度比冲增加,燃烧效率降低;增加燃烧室特征长度有利于提高含碳UDMH的燃烧效率;含碳UDMH适应于液膜冷却.

Addition of C to liquid propellant is one of the methods for improving energy density. To obtain the ignition characteristic of UDMH containing carbon and the design method for high-efficiency combustion chamber, liquid rocket engine chamber is designed for the like-on-like injector. The combustion characteristic of UDMH containing carbon, the effect of characteristic chamber length on combustion efficiency and the cooling characteristic are experimentally studied. The results show that effective film cooling can be obtained using UDMH containing carbon are equivalent to those of liquid propellant. It is also shown that the addition of C to UDMH can result in the increase of density specific impulse and the decrease of combustion efficiency, and that with the increase of characteristic length, combustion efficiency increases.