As a new non - contacting , no - leaking face seal , in the past few years , the spiral groove seal has been used widely in many fields , such as the aviation - aerospace and the petrochemical industry 作为一种非接触式并且能达到“零泄露”的新型密封型式，螺旋槽密封在航天航空和石油化工等领域的应用越来越广泛。
( b ) the linear fluid model is used to study the conductor - centered helical groove twt . we have analyzed the effects of the beam parameters on the gain and the bandwidth of the twt ( 2 )我们用线性理论模型研究了具有中心导体轴的矩形螺旋槽行波管内的注-波互作用特性，对电子注参量对小信号增益和带宽的影响进行了分析。
For the liquid in the multi - head twisted and fluted tube can cross the boundary of the channel and merge into the fluid flow in the next channel , the film distribution of multi - head twisted and fluted tube is overmatch single - head twisted and fluted tube 当螺旋槽管表面为多槽道时，各槽道间发生流体的相互掺混使得液膜分布特性较单槽道时要好。
To settle for the special work - conditions " seal demand and with the academic development of gaseous spiral groove seal and application in industry , liquid spiral groove seal research desiderates urgently a great development 在气相螺旋槽密封理论及应用日益成熟的条件下，液相螺旋槽密封也亟待取得进一步的发展，以便满足在特殊工况条件下的应用要求。
But such research is very limited and has not been investigated in domestic at the present time . the purpose of this project is to satisfy this requirement and establish the base for farther research 目前国内关于液相端面开螺旋槽的机械密封研究工作非常有限，本课题论文目的就是通过探讨端面间薄膜密封的机理和密封性能，从而为进一步的研究奠定基础。
Ph linearization method is employed to solve a nonlinear reynolds equation for a steady state and micro - scale flow field , and the approximate function expressions of gas dynamic pressure and velocity in the spiral groove are obtained 摘要应用ph线性化方法、迭代法，近似求解了螺旋槽内稳态微尺度流动场的非线性雷诺方程，求得了气体动压和速度分布的解析解。
The purpose of this study is to investigate the formation of liquid falling film and its flow behavior on the surface of a horizontal twisted and fluted tube used in the case of wet flue gas desulfurization , desalination , and so on 本文从理论上研究了水平螺旋槽管壁面液膜的形成机理及流动特性，为工业生产过程中高效换热器的应用提供理论基础。本文做的主要工作有： 1
The method was used to analyze the mechanism for enhancing heat transfer by way of using numerical analysis and can be used to study how to apply the field harmony theory to spirally fluted tube strengthen heat - transfer 本文在场协同理论指导下进行了强化换热机理探讨，利用数值分析方法，从分析流场与温度场的协同配合关系入手，研究场协同理论在螺旋槽管强化传热中如何应用问题。
( c ) for the helical swallow - tailed structures with same groove width , the deep groove depth one which is suitable for the use in a interaction system of high power twts , has the largest coupling impedance and the lowest phase velocity in comparison with the other different groove profiles （ 3 ）具有相同槽日宽度的燕尾形螺旋槽结构在槽深度较深情况下用作大功率行波管的互作用系统具有最大的耦合阻抗和最低的相速。
