First , the noblesse new slender ship theory is introduced and modified to make it suitable for numerical calculation , with which we can calculate the wave - making resistance coefficient of a ship 首先引入noblesse新细长船理论，通过在理论方法上的改进，使之适合于半滑行船兴波阻力系数。
The secondary air duct of boilers is a group of large diameter short ducts in parallel connection , having inlet air flow condition with inner positioned resistant pieces 摘要锅炉二次风道为有内置阻力件的一组并联大口径短通道，其阻力系数严重偏小而且风门涡流强烈，从而造成二次风强烈脉动。
( 2 ) the effect of rainfall splash intensity on hydrodynamic features of sheet flow indicated that , the former had a remarkable effect on the latter ( 2 )雨滴打击强度对坡面薄层水流水动力学特性的研究结果表明，雨滴打击强度对坡面薄层水流水动力学特性(流速、水深、流态、阻力系数等)影响显著。
Abstract : the function expression for coefficient of pipeline ' s local head loss was presented through optimizing fitting to coefficient values listed in tables . the fitting accuracy is acceptable 文摘:采用优化拟合法通过对图表中有关数值的拟合，给出了管道阀件阻力系数的函数表达式，具有较高的拟合精度。
Fixed the angle of attack , in subsonic situation , the drag coefficient was reducing with the velocity increasing ; in supersonic situation , the drag coefficient was increasing with the velocity increasing 攻角不变,亚声速情况下,阻力系数随速度的增大而减小;超声速情况下,阻力系数随速度的增大而增大。
Lastly , by combining the noblesse new slender ship theory and the savitsky method , we get the wave - making resistance prediction method for semiplaning ship . examples of calculation are also presented 最后将改进的noblesse新细长船理论与sit法结合，得到了计算半滑行船兴波阻力系数的方法，并给出了计算实例。
As for fixed vehicle spacing , with the increase of vehicle number in platoon , the average drag coefficient can reduce by 20 % ~ 30 % and the vehicle with the lowest drag is about at the center of the platoon 在固定间距下，随着队列中车辆数目的增加，平均阻力系数可降低20 % ~ 30 % ，阻力最低的车大致处于车队的中心位置。
3 the parmeter of the heating network was recognized in genetic algorithm . on basis of it , the problem of waterpower maladjustment was settled . it provide qualification for even heating , when the heat energy is lack 3运用遗传算法对整个管网的阻力系数进行辨识，根据阻力系数解决了水力失调的问题。在热量不足时，为均匀供热提供了依据。
