CAJ | 학술논문

针对管道内横向凹槽减阻问题，采用标准κ-ε模型，通过数值仿真，计算比较了在10组管道内不同流速情况下的阻力，分析了速度和凹槽形状对减阻的影响。得到凹槽减阻机理：凹槽内的低速流体相当于一层水膜，可使高速流体不直接与管内壁接触，从而减小摩擦阻力；同时凹槽内漩涡区越规则，局部阻力越小。
침대관도내횡향요조감조문제，채용표준κ-ε모형，통과수치방진，계산비교료재10조관도내불동류속정황하적조력，분석료속도화요조형상대감조적영향。득도요조감조궤리：요조내적저속류체상당우일층수막，가사고속류체불직접여관내벽접촉，종이감소마찰조력；동시요조내선와구월규칙，국부조력월소。
In order to analyze the characteristics of the resistance in the transverse groove of pipelines,the standard k-εmodel was adopted to numerical y calculate and compare the resist-ances under the conditions of different velocities in ten groups of pipelines,and the impact of speed and groove shape on the drag reduction could be obtained through these numerical simu-lations.Based on al these analysis,the drag reduction mechanism of groove pipelines could be obtained,i.e.,the low-speed fluid is regarded as a layer of water film,which makes the high-speed fluid contacts with the inner wal of the tube,and the friction of the groove could be indi-rectly reduced.Therefore,the local fluid flow resistance wil be decreased as the vortex zone within the groove becomes more regular.