槽道流转捩中发卡涡演化与波增长的关系  

Relationship Between Evolution of Hairpin Vortex and Increase of Waves in Channel Flow Transition

作　　者：王新军[1] 罗纪生[1] 

机构地区：[1]天津大学机械工程学院,天津300072

出　　处：《天津大学学报》2010年第2期126-131,共6页Journal of Tianjin University(Science and Technology)

基　　金：国家自然科学重点基金资助项目(10632050);国家自然科学基金资助项目(10802058)

摘　　要：通过对槽道流常规转捩的直接数值模拟,研究了转捩突变前后,发卡涡的演化与T-S波增长的对应关系,重点对占流场绝大多数、转捩前期增长缓慢的T-S波的急速增长在发卡涡演化中所处的阶段进行了分析.研究发现,在发卡涡头部形成阶段,流场中典型的未增长起来的波一直保持着缓慢的增长趋势;当发卡涡头部产生分离时,这些波的实际增长率开始爆发式增加,并在短时间内呈数量级增长,急速增长的过程一直延续到发卡涡头部混乱之后.Laminar-turbulent transition has been studied by means of DNS of channel flow and the relationship between the evolution of hairpin vortex and the increase of T-S waves in channel flow transition has been discussed,with the rapid increase of the undeveloped T-S waves,which constitute the majority of all waves in the flow,in the stages of hairpin evolution as focus of the analysis.Results show that the typical undeveloped waves keep the original low increasing rate during the forming stage of the head of hairpin vortex,and when the head of hairpin vortex begins to split the real increasing rate of these typical undeveloped waves starts to rise rapidly and achieves orders of magnitude increase in a short time until the head of hairpin vortex is in disorder.

关 键 词：T-S波 发卡涡 尖峰结构 增长率 突变 

分 类 号：O357.5[理学—流体力学]