摘要
通过风洞测压与数值模拟研究了旋成体滚转过程。结果表明,侧向力的滚转角效应与模型加工精度有关;位于模型头部尖端一定量级的微扰动不仅能触发非对称,而且促使流场呈现Bistable状态。然而法向力无明显的滚转角效应。研究流场表明Bistable的左右两类涡系在结构上无明显差异,也并非完全的镜像状态。通过控制微扰动的周向位置可以获得期望的非对称多重涡流场。涡系诱导作用增强,对侧向力和法向力都有增值。
The roll angle effects on the load for flow over a slender body were studied by pressure measurements in a wind tunnel and by numerical simulations. The results show that the model machining precision strongly affects the load. Perturbations on or near the nose tip trigger asymmetric flow that results in two stable flow fields with differing side forces. The normal force is not strongly influenced by the roll angle. There is no apparent difference between the right and left vortex flow patterns, but the two flows are not exact mirrors. Moving the perturbation location along the circumference gives an expected flow fields with a series of asymmetric vortices. Enhancement of the vortical effect can benefit both the side force and the normal force.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2005年第8期1079-1082,共4页
Journal of Tsinghua University(Science and Technology)
