摘要
为研究变循环发动机单/双涵道模式转换动态过程中流场参数的变化规律,基于本项目组设计的模拟模式转换过程的试验台,利用动网格技术对该试验台进行了二维数值模拟。结果表明:在模式转换动态过程中,内外涵流量和总压的变化滞后于阀门缓慢关闭的状态;并且阀门变化速率越快,其内涵总压和流量的动态响应越滞后;而静压的变化规律则相反。此外,还研究了在阀门关闭过程中,不同初始涵道比对这种流场参数变化滞后性的影响。发现初始涵道比越小,滞后性越强;并且这种滞后性在阀门关闭至22°位置时达到最大。
To explore the flow field structure during the dynamic process of single/double bypass model se- lection in variable cycle engine （VCE）, an experimental equipment designed by our group is used to imitate the dynamic process, and a two-dimensional numerical simulation by dynamic mesh is carried out on this experi- mental equipment. During the dynamic process, the mass flow＇ s and total pressure＇ s variations were found to lag behind the condition of valve＇ s switching at a low speed, and with the switching speed increased, the lag will become larger. However, the regulation of static pressure＇ s variation is contrary. Furthermore, we studied the ef- fects of different initial bypass ratios on the lag during the closing process, and found that the smaller initial by- pass ratio, the larger the lag will become, the lag reaches the maximum when the valve is closed to 22° on clos- ing process.
出处
《推进技术》
EI
CAS
CSCD
北大核心
2017年第8期1699-1708,共10页
Journal of Propulsion Technology
关键词
变循环发动机
模式转换
数值计算
动网格技术
Variable cycle engine
Model selection
Numerical simulation
Dynamic mesh
