We studied its characteristics of enhanced heat transfer and flow resistance . this article analyzed the influence of some parameters on channel ' s enhanced heat transfer and flow resistance . such as re , the hole ' s diameter with no unit d / 1 , level center distance with no unit sl / 1 and vertical center distance s2 / l etc . and compared the characteristics with the no hole baffle 本文对通道内设置多种开孔折流板的换热与流动阻力特性进行了实验研究，讨论分析了雷诺数re以及通道内设置开孔折流板的无量纲孔径d w 、无量纲水平中心距s1 w和无量纲垂直中心距s2 w等多个参数对通道强化换热与流动阻力特性的影响。
Abstract : the paper suggests two methods for adjusting the mesh clearance in cylindrical worm drive : one is to adjust the meshing center distance of worm gears , the other is to use dual lead cylindrical worm , introducing briefly the principle of adjustment and making a comparison between the characteristics of the two methods 文摘:提出了两种调整圆柱蜗杆传动啮合侧隙的方法:通过改变蜗轮蜗杆的啮合中心距来改变其啮合侧隙;采用双导程蜗杆传动以调整蜗轮蜗杆的啮合侧隙,简述了调整原理,并比较了两种调整方法各自的特点。
The curvature interference of the gear and the influence of radius of the mill - cutter , axial misalignment , and center distance on meshing are analyzed . based on these analyses , propose two methods to achieve point - contact : to change the radius of the mill - cutter and increase the center distance 在分析了弧齿线圆柱齿轮的啮合传动不产生曲率干涉的条件和刀盘展成半径、轴线平行度误差、中心距对啮合影响的基础上,提出了点接触弧齿线圆柱齿轮实现的两种方案:调整刀盘展成半径和增大中心距。
This paper mainly discussed the optimization design of two - stage star - type gear transmission system . it covered the two sides : one - stage gear transmission and two - stage gear transmission . on the basis of their analysis and research , the mathematic models are created which include the objective functions of minimum volume and minimum center distance , the constraints of contact strength , bend strength and scuffing strength 本文主要研究了航空发动机星型齿轮传动系统的优化设计，对单级齿轮传动和两级星型传动都进行了深入的分析和探讨，分别以系统体积最小和中心距最小为目标函数，以齿轮的接触强度、弯曲强度、胶合强度等为约束条件，建立了完整的数学模型。
