A theory for the analysis of the arbitrarily - shaped helical groove structure is obtained by means of an approximate field - theory 采用近似场论的方法，获得了一种分析任意槽形螺旋槽结构的普遍理论。
The bandwidth of this kind of twt can reach 30 - 40 % if choosing the optimal parameters of the structure and the beam 因此，合理选择慢波结构几何尺寸和电子注参数，具有中心导体轴螺旋槽行波管的相对工作带宽可以达到30 ? 40 。
Experimental study of the enhanced convection heat transfer and frictional characteristics of non - phase - transition fluid in inner chute - spirally corrugated tube 无相变流体在内斜齿螺旋槽管内强化对流换热与阻力特性的实验研究
The results indicate that the film thickness on the surface of the horizontal twisted and fluted tube becomes more uniform than the classical smooth tube 结果表明，与水平光滑圆管相比，水平螺旋槽管表面的液膜变薄且分布变均匀。
Its characteristic and typical structures are given , and the structure and characteristic of the spiral groove seal of the unilateral pump pattern are discussed 给出了干气密封的特点及典型结构，研究了螺旋槽单向泵入式密封的结构及特性。
Technology of loxodrome coolant channel machining on liquid rocket engine . yuhang xuebao / journal of astronautics . vol . 24 no . 3 . may , 2003 . wang yongqing ， lu jiechi , tong yu 等倾角螺旋槽的片铣刀铣削加工技术.工具技术. 2002年第8期. 2002年8月.王永青，卢杰持
( b ) when the depth of the groove is relatively shallow , the helical triangle - shaped helical groove has the widest bandwidth , the least dispersion , and the fastest phase velocity 门）当槽的深度较浅时，三角形螺旋槽的频带宽度最大，且色散最弱，波的相速最大。
( b ) when the depth of the groove is relatively shallow , the helical triangle - shaped helical groove has the widest bandwidth , the least dispersion , and the fastest phase velocity ( 2 )当槽的深度较浅时,三角形螺旋槽的通频范围最大,且色散最弱,其中波的相速和群速最大。
A trade - off function of rigidity - to - spillage ratio is derived and the optimized geometric parameters are acquired by solving the objective function 继而利用多目标优化方法构建了气膜刚度与泄漏量之比的协调函数，并对该目标函数进行了近似求解，获得了最佳的螺旋槽几何参数值。
For the first time , the unified " hot " dispersion equation which can be used to analyze structures with different groove profiles is obtained by means of an approximate self - consistent field - theory 采用近似自洽场论的方法，首次得到了适用于分析不同螺旋槽结构的统一的“热”色散方程。
