Thirdly , it simulated the pumping circuit & dividing circuit with the widely used software matlab / simulink . the displacement of the rod piston and the impact of hydraulic are analyzed in the different input flow ( frequency of pump ) and different reversing time . it found out the cause of hydraulic impact ( one - to - one incorrespondence between the response time of dividing circuit and the operation time of rod piston ) , and gave some methods to weaken hydraulic impact . in the final part of the paper , the reliability of the theory analysis is further verified by the experiment of hydraulic system 首先在流变学原理的基础上，深入分析混凝土在输送管道内的流动状态，得出混凝土泵的负载特性方程；然后根据功率键合图的建模方法，建立泵送回路和分配回路的数学模型，并运用仿真软件matlab simulink对泵送和分配回路模型进行了仿真，分析了在不同的输入流量(泵送频率)和换向时间下，活塞杆的位移和系统的液压冲击情况，找到了引起液压冲击的根本原因(即分配回路的响应时间(固定值)与活塞杆的运动时间(变化值)不相匹配) ，并提出了相应的改进方法。
As we know , when meeting these soils , many breakdown and danger will occur , such as the blockings , which has attracted attention of many construction personal on site . however , at present , there exist many unknown fields in blocking . firstly , the definition of blocking is not interpretative 但是，如果地层是粘粒含量较少的卵石层、砂土地层、风化岩地层，进入压力舱的土体就很难形成这种“塑性流动状态” ，从而严重阻碍施工进程甚至造成施工事故，闭塞就是常见的一种施工障碍，已经引相关方面的重视。
In order to study the stability of non - newtonian fluid and its flow pattern discrimination method , the integral stability theory and local stability theory are applied to the concentric annulus flowing of plastic fluid and power - law fluid , then a relevant stability parameter expression of discriminating flow pattern is derived and set up in the paper 摘要针对非牛顿流体的稳定性问题及其流态判别的研究，将整体稳定性理论及局部稳定性理论应用于塑性流体和幂律流体在同心环空的流动中，建立和推导出相对应的判别流动状态的稳定性参数表达式。
By analyzing flow status of fluid in aerating pipeline , giving up hydraulics and utilizing hydromechanics and advance numerical calculations , the prediction method to solve optimizations height on flow status in aerating pipeline is studied and put forward , which provides a scientific theory base to realize effective drag reduction and economic principle in blend phase transportation for pipeline design 摘要通过分析掺入少量高粘流体形成分层紊流层流的流动状态，抛弃传统的水力学研究方法，应用流体力学原理、高级程序设计语言和先进的数值计算技术研究了掺入少量高粘流体分层紊流层流减阻规律，为实现管道混相输送时高效减阻和经济节约的设计提供理论依据。
( 2 ) used the predecessors " research achievements for reference , an experimental provision by which relationship between capillaiy pressure and saturation and relationship between unsaturated permeability and capillary pressure of fracture can be determined simultaneously is developed for the first time . experiment of simplified fracture model on the provision is done 借鉴前人的研究成果，基于动力法原理（即逐次建立水相和气相之间的稳定流动状态） ，首次研制出了一套可同时测定单裂隙毛细压力饱和度以及非饱和渗透系数毛细压力关系的实验装置。
The results show that the squeeze viscous force decreases with the slip parameter increases , rigid region of the fluid increases with the slip parameter increases . when the slip parameter tends to infinite , the results of the squeeze viscous force reduce to the case of the squeeze flow of rigid - plastic solid between two parallel disks 结果表明，圆盘上的挤压力随着滑移参数的增加而减小，当流体全部处于流动状态时，即为圆盘挤压牛顿流体时的情况；当流体全部处于刚性状态时，即为圆盘挤压理想刚塑性介质时的情况。
The research indicates that the orifice jet in mixing conditions has many different points from the pipe jet . focusing on the jet ejected from the orifices of different diameters and lengths , this paper studies the orifice jet when the fluid upstream of the orifices is in mixing conditions . the main purpose is to qualitatively study the effect of orifice diameters and lengths on the spread of the jet 射流是在工程实际中广泛存在的一种流动现象，喷嘴出口的流动状态对射流的发展有很大的影响，前人对射流的研究主要集中于喷嘴前流体是完全发展管流的情形，本文研究了全混状态下的板式射流，研究结果表明全混状态下的板式射流具有很多不同于管射流的特点。
A two - dimensional double diffusive laminar natural convection in rectangular enclosure is detailed analyzed . the results show that when the thermal and solutal buoyancies aid each other , the airflow consists of one main cellular structure and is steady , regardless of the relative strength variation between the heat and pollutant sources . there are multiple flow structures , however , according to the relative strength when the buoyancies opposing each other 模拟结果表明双扩散自然对流系统的空气流动与传热传质特性完全是由离散热源与污染源浮升力之间的相互作用关系诀定的：当离散热源与污染源浮升力协同作用时，自然对流呈比较稳定的单一流动结构；而当热源与污染源浮升力对抗作用时，自然对流系统随它们之间强度变化呈现出多种流动状态。
