摘要
采用滑移网格法对某微型轴流风扇级环境下的非定常流场进行数值模拟,分析下游静子干涉下转子区域内部流场的非稳态特征。研究结果表明:下游静子的存在,对上游转子通道内速度场及其相关量影响较小。转子在经过压力不均匀的下游压力场时,通道内压力波动从尾缘处的25%衰减到前缘的15%,压力面的衰减速度要大于吸力面。叶排间的干扰以压力波的形式向上游转子通道内传递,使得转子通道内压力呈现明显的类正弦式的周期性变化,这是典型的势干扰作用。
In order to understand unsteady flows in a micro-axial fan rotor caused by downstream stator interactions, numerical simulations are carried out by utilizing a sliding mesh technique. It is revealed that, with the existence of the downstream stator, the pressure on the rotor blade＇ s surfaces visibly fluctuate with a maximum magnitude of 25% inlet dynamic pressure at the trailing edge. The oscillation propagates upstream and decays. Till the leading edge of the rotor blade, the pressure fluctuation can still reach up to 15% inlet dynamic pressure. However, the fluctuations of the physical quantities, which are relevant to the velocity （such as relative velocity, secondary flow, vorticity）, are very limited. Due to non-uniform pressure field withindownstream stator, the pressure field within the rotor passage is affected by the downstream boundary layer zone （low pressure zone） and the downstream main flow zone （high pressure zone） alternatively. This typical potential interaction due to the downstream stator propagates upstream in the form of a sinuous wave.
出处
《风机技术》
2016年第3期31-36,共6页
Chinese Journal of Turbomachinery
基金
国家自然科学基金项目(50876031)
上海市教委科研创新项目(10ZZ40)
关键词
微型轴流风扇
动静干涉
滑移网格
压力脉动
势干扰
micro-axial fan
rotor-statorintera ction
sliding mesh
pressure pulsation
potential interaction
