弯曲通道模拟离心条件下的主燃级和预燃级联焰试验

冲压转子发动机是冲压发动机和燃气涡轮发动机的有机结合,其结构简单。冲压转子发动机燃烧室由于其内部受到强离心力场的作用,燃烧室火焰的稳定燃烧以及传播都会受其影响。为了得到离心力场对分级燃烧中两级联焰的影响规律,本文进行了试验研究工作。针对燃烧室在强离心条件下的燃烧特点,采用弯曲通道模拟气流的离心效应。在弯曲试验段上对预燃级和主燃级进行了联焰研究,试验在常温常压条件下进行,进口气流速度范围为10~70m/s。试验中考察了离心力、燃油分级比例以及主燃级燃油喷射初始角度对联焰的影响,试验结果初步验证了燃烧方案的可行性,为冲压转子发动机燃烧室的研究奠定了基础。

Experiment of flame crossover between main stage and pilot stage under centrifugal force effect in curved duct

The ram rotor engine is a novel technology combined of ramjet engines and gas turbine engines, having simple configuration. The flame stability and propagation are under strong effects of centrifugal force in the combustor of ram rotor engine. Experimental research work is carried out to study the effects of centrifugal force on the flame crossover between two stages. According to the characteristics of combustion under centrifugal force, a curved duct is used to simulate the centrifugal effect. Tests of flame crossover between pilot stage and main stage are carried out under ambient pressure and temperature, with the inlet air velocity ranging from 10 m/s to 70 m/s. The effects of centrifugal force, fuel allocation proportion and fuel injection initial angle on the flame crossover are investigated in the tests. The results of tests preliminarily verify the feasibility of this combustion scheme and lay a foundation for the research of ram rotor engine combustor.