气氧/煤油富燃燃气发生器燃烧试验研究

Experimental Investigation on Combustion in a Fuel-Rich

关键词:  富燃燃气发生器  燃烧  点火  热力特性

Key words:  Fuel-rich gas generator  Combustion  Ignition  Thermal characteristics

摘要:

为了研究航天煤油的富燃燃烧特性，设计了一个气氧/煤油富燃燃气发生器，并进行了室压范围1 ~ 4MPa、混合比范围0.25 ~ 0.52的燃烧试验，获得了混合比和室压对特征速度、燃气温度及燃烧效率的影响规律。试验结果表明，采用火花塞点火方式可以实现该燃气发生器在高度富燃条件下的可靠点火；在本文研究范围内，试验测得的特征速度和燃气温度明显低于化学平衡理论预测值，燃烧效率介于63.9% ~ 88.3%之间。混合比是特征速度、燃气温度及燃烧效率的最大影响因素，室压的影响远小于混合比。燃烧效率与实际燃气温度与理论燃气温度比值的平方根成正比。

Abstract:

In order to study the fuel-rich combustion characteristics of kerosene，a fuel-rich GOx/kerosene gas generator was designed and combustion tests were conducted，covering the chamber pressure range of 1 ~ 4MPa，and the mixture ratio range of 0.25 ~ 0.52. The effects of mixture ratio and chamber pressure on characteristic velocity，gas temperature and combustion efficiency were obtained. The results show that，the fuel-rich gas generator can be ignited reliably with a spark igniter. The measured characteristic velocity and gas temperature are significantly lower than the chemical equilibrium predictions，and the combustion efficiency varied from 63.9% to 88.3%. It can be concluded that the mixture ratio is the main factor influencing characteristic velocity，gas temperature and combustion efficiency，while the chamber pressure has much less impacts on them. The combustion efficiency is proportional to the square root of the ratio of the measured and predicted gas temperature.