The influences of the aspect ratio and wall roughness on the coolant flow characteristics, which mainly involve pressure loss, secondary flow and turbulence intensity, were investigated.
研究了高宽比和壁面粗糙度对压力损失、二次流动和紊流强度的影响。
2
The turbulence induced by the defects of nozzle, such as the burr at the inlet and outlet, and the roughness of the wall, is the main cause to decrease the length of intact jet.
当射流速度比较大时，喷管的缺陷如进口出口的毛刺和流道壁的粗糙度是诱发湍流使射流破断的主要原因。
3
The anisotropy invariant map was also introduced briefly. The effect of the distance away from the wall and the Reynolds number on the turbulence structure in a pipe flow was also analysed.