CAJ | 학술논문

文章采用直接数值模拟方法，对流向传播的展向Lorentz力作用下槽道湍流的壁面减阻效果和减阻机理进行了研究，通过改变电磁力强度A和流向波数kx，可以使壁面阻力明显减少。讨论了电磁力强度A和流向波数kx对湍流猝发事件及壁面减阻率的影响。结果表明，A或kx有一不变另一增加时，湍流猝发频率和猝发强度的变化趋势是相同的，先减小并同时达到最小后增加。故存在最优参数A、kx，使减阻效果最好。
문장채용직접수치모의방법，대류향전파적전향Lorentz력작용하조도단류적벽면감조효과화감조궤리진행료연구，통과개변전자력강도A화류향파수kx，가이사벽면조력명현감소。토론료전자력강도A화류향파수kx대단류졸발사건급벽면감조솔적영향。결과표명，A혹kx유일불변령일증가시，단류졸발빈솔화졸발강도적변화추세시상동적，선감소병동시체도최소후증가。고존재최우삼수A、kx，사감조효과최호。
The effect and mechanism of turbulent drag reduction using spanwise Lorentz force is investigat-ed numerically by direct numerical simulation (DNS). The drag can be reduced significantly by changing Lorentz force intensity A and wave number kx. The influence of Lorentz force intensity A and wave number kx on the drag reduction and turbulent burst events is discussed. The results show that when increasing A or kx, the tendency of the frequency of the turbulent bursts events is identical with the intensity of the turbulent bursts events, which is earlier reducing, simultaneously achieving its minimum and then increasing. Hence there exists an optimal parameter to achieve the largest amount of drag reduction.