CAJ | 학술논문

在建立超疏水表面流场数值仿真模型的基础上，对具有微观形貌的超疏水表面在湍流状态下的流场特性和减阻规律进行了仿真研究。仿真结果显示，超疏水表面气液界面处产生了显著的滑移流动，微观形貌附近出现了成对的流向涡。这些因素共同抑制了湍流脉动，降低了各向雷诺应力，减少了流动能量损失，从而使超疏水表面产生减阻效果；超疏水表面减阻量随自由剪切面积比的增大而增大，随形貌周期的增大而增大，且减阻效果与滑移之间存在定性的关系，滑移越大，减阻效果越好。
재건립초소수표면류장수치방진모형적기출상，대구유미관형모적초소수표면재단류상태하적류장특성화감조규률진행료방진연구。방진결과현시，초소수표면기액계면처산생료현저적활이류동，미관형모부근출현료성대적류향와。저사인소공동억제료단류맥동，강저료각향뢰낙응력，감소료류동능량손실，종이사초소수표면산생감조효과；초소수표면감조량수자유전절면적비적증대이증대，수형모주기적증대이증대，차감조효과여활이지간존재정성적관계，활이월대，감조효과월호。
Based on the numerical simulation model of superhydrophobic surfaces flow field, the flow field characteristics and the drag reduction law are studied with superhydrophobic surfaces with the microcos-mic topography in turbulence. The results show that the prominent slip flows on the gas-liquid interface and the conjugated streamwise vortex near the microcosmic topography of superhydrophobic surfaces appear. These factors inhibit the turbulent fluctuation, reduce Reynolds stress and energy loss together, so that the superhydrophobic surfaces generate drag reduction effect; the drag reduction of superhydrophobic surfaces increases with the increase of the free shear area ratios and increases with the increase of the topography periods. There is a qualitative relationship between the drag reduction and the slip, namely the greater slip, the better drag reduction effect.