摘要
以引入了非恒定摩阻项的圆柱环数学模型为基础 ,从横向微观的流速分布和切应力分布角度 ,分别对管道中的瞬变层流和瞬变湍流进行了拟二维数值分析 ,明确了非恒定摩阻项对流动瞬变过程的影响 .说明非恒定摩阻的存在导致了水击压力波波幅衰减和波形畸变现象 ,而采用恒定状态下的摩阻关系式无法反映这个现象 .非恒定摩阻项对层流的影响很大 ,对湍流的影响相对较小 .
The unsteady friction of transient pipe flow is introduced into the cylinder_model. On the basis of the cylinder_model, the transient laminar and turbulent pipe flow are analyzed respectively by semi_2D numerical method from the view of transverse micro_profile of flow velocity and shear stress. And the influence of unsteady friction on transient pipe flow is defined. The phenomena of amplitude attenuation and wave_shape aberrance arise from unsteady friction, while the steady friction term cannot reflect these phenomena. The effect of unsteady friction on laminar flow is greater than that on turbulent flow.
出处
《武汉大学学报（工学版）》
CAS
CSCD
北大核心
2002年第2期13-17,共5页
Engineering Journal of Wuhan University
关键词
特征线法
管道
非恒定流
摩阻
湍流模型
圆柱环模型
characteristic method
transient pipe flow
friction
turbulent_flow model
cylinder_model
