The formula for force of flow - induced vibration is derived , the forces of flow - induced vibrations in fluid - conveying pipes in the different flow conditions with significant stimulation are calculated according to the formula derived and the results obtained in the fourth chapter . the results obtained are analyzed 推导出求解管内流体激振力的公式，根据此公式及第四章中的计算结果，求得了不同来流条件下，非微小激励情况下的变截面输液管的管内流体激振力。
The mechanisms of flow - induced vibrations of the fluid - conveying pipes on offshore platform and in water are analyzed , the physical models and mathematical models of flows in pipes on offshore platform and in water are established , with the programs of numerical simulation , the flow of vibrating pipe , the force of flow - induced vibration in pipe on offshore platform and the lift and the drag of flow acting on the fluid - conveying pipe in water are solved , and the linear solution for equation of vibrating fluid - conveying pipe in water with the fixed supports in two ends is derived 分析了海洋平台及水下输液管道的流体激振机理，建立了相应条件下的物理模型及数学模型，应用matlab软件编制了计算程序，对海洋平台输液管道内流流场、管道所受流体激振力及水下输液管道绕流受力(横向升力及纵向阻力)分别进行了求解，并推得了两端固支条件下水下输液管道强迫振动方程的线性解。
The mechanism of vibration induced by flow in the fluid - conveying pipe on offshore platform is analyzed , the physical model and mathematical model of unsteady , incompressible , viscous flows in vibrating pipes with different cross - sections are established , flows of pipes in different flow conditions with the insignificant stimulations are solved 分析了海洋平台输液管道流体激振机理，建立了等横截面、变截面输液管道流动的物理模型及数学模型，求解了不同形状管道，不同来流条件下，微小激励情况下的输液管内流的流场。
A reasonable position of driving nozzle helps to achieve the maximum material flow that also depends on other parameters such as backpressure , properties of conveyed material and driving gas . it is observed that , an increase of convergent section angle is harmful to the pneumatic conveying system , and also influences on the mass flow rate of conveyed material , the distribution of static pressures in injector and the pressure drops of conveying pipe . in addition , within a reasonable scope of air mass rate , increasing the driving jet velocity is more advantageous than enlarging the dimension of driving nozzle 试验研究发现，气体喷嘴位置对气固喷射器的输送能力影响最大，气体喷嘴存在某一最佳位置，而这一最佳位置与背压、输送物料特性和输送风特性相关联；气固喷射器的收缩角对其输送能力、内部静压分布和输送管阻力特性均有适量影响，收缩角增大对整个输送系统均不利；在适当的输送风范围内，提高气体喷嘴出口速度比扩大气体喷嘴尺寸更为有利，但气体喷嘴出口速度过高会增加气固喷射器和输送管内的能量损耗，给输送带来不利的影响；系统背压与气固喷射器的气体喷嘴出口速度的选取有关。
Meanwhile , it puts forward the exact demand to the indicators of coal for gasification . it systematically studies the thickness of economical heat preservation and calculation process of resistance loss of delivery pipe for analyzing and appraising the techno - economic of hot coal gas ' s delivery pipes . it sets the mathematic model for the calculation of economical heat preservation thickness and resistance losses of conveying pipes , compiles the computer program , dutti and dutt2 and draws the block diagram of relevant computer program 为便于热煤气输送管道的技术经济分析与评价，对输送管道经济保温厚度和输送管道阻力损失的计算过程，进行了系统的研究，建立了输送管道经济保温厚度和阻力损失计算的数学模型，绘制出相应的计算机程序框图，编制了计算机程序dutt _ 1和dutt _ 2 ；并对热煤气的混合燃烧过程进行了研究。
By use of grid - shaping skill and multi - grid solver , the flow - induced vibration of the fluid - conveying pipe in water is studied . the vibration mechanism of the fluid - conveying pipe in water is analyzed , the lift and drag acting on pipe in water are calculated . the results obtained are analyzed and compared to the experimental data referred to 首先对水下输液管道绕流涡激振动的机理进行了分析，然后，利用网格生成技术及多重网格法求得了输液管道在不同来流条件(雷诺数)下的横向升力系数及纵向阻力系数，最后对计算结果进行了分析，并将其与已有的间接实验结果进行了对比。
