摘要
利用Boussinesq假设,采用混合长度模型,对具有轴向通流的双旋转轴间的流动换热进行了数值研究,得到了轴间气体充分发展段的速度分布、温度分布和加热边的对流换热系数,其结果在实验模型参数范围内与PfitzerH的实验研究符合较好。在此基础上,进一步数值模拟研究了同向等速旋转双轴间不可压流的离心浮升力对流动换热的影响,结果表明:离心浮升力对流动换热的影响取决于浮升力与惯性力之比GrB/Re2z。当GrB/Re2z≥24时,浮升力的影响十分显著,不可忽略。
Heat transfer in the air gap of two co-rotating cylinders was numerically studied, based upon the Boussinesq approximation and mixing length theory. The code developed was verified with Pfitzer's H experimental results and the agreement was satisfactory. Investigation was focused on the influences of the buoyancy force on the heat transfer process. The two cylinders were kept the same rotating speed. The importance of the buoyancy force was found to be dependent upon the non-dimensional number Gr_B/Re^2_z. Numerical studies revealed that the buoyancy force has to be taken into consideration when Gr_B/Re^2_z≥24.
出处
《推进技术》
EI
CAS
CSCD
北大核心
2003年第6期543-546,共4页
Journal of Propulsion Technology
关键词
航空发动机
浮力
传热
双旋转轴
数值仿真
Aircraft engines
Buoyancy
Heat transfer
Twin axis of rotation
Numerical simulation
