Φ150两相流泵试验台

本文详细介绍了试验台装置系统与测试系统，并进行了台位精度的初步分析。该台位符合两相流泵标准及有关国际规程要求，同时采用计算机辅助测试，符合现代测试规范，为两相流泵设计与生产提供了一种有力的科研测试手段。     

Φ150两相流泵试验台

本文详细介绍了试验台装置系统与测试系统,并进行了台位精度的初步分析。该台位符合两相流泵标准及有关国际规程要求,同时采用计算机辅助测试,符合现代测试规范,为两相流泵设计与生产提供了一种有力的科研测试手段。     

固液两相流泵蜗壳结构设计与扬程的关系研究

通过联立固液两相流泵蜗壳的不同形式的特性方程,得出了全新的两相流泵流量扬程与蜗壳基圆、喉部面积等的数学关系式,并分析了蜗壳结构(基圆、喉舌面积)对两相流泵的扬程的影响规律,即两相流泵的扬程与蜗壳基圆直径成正比,两相流泵扬程与喉部面积成反比。     

离心式气液两相流泵的试验研究

通过对QYS100－20型离心式气液两相流泵的试验，分析和研究了泵的性能，获得了研制高含气量的气液两相流泵的宝贵经验。     

轻型化工渣浆泵叶轮轴向间隙泄漏流及磨损特性分析

针对渣浆泵的泵腔及叶轮磨损问题,基于DPM模型对LCF100/350型化工渣浆泵叶轮轴向叶顶间隙泄漏流及磨损特性进行数值分析。在清水介质条件下对泵轴向叶顶间隙泄漏流结构及泵外特性进行模拟,并与试验结果进行对比分析;固液两相流分析中液相采用k-ε Realizable湍流模型,固体颗粒相采用离散相模型,分析了叶轮轴向叶顶间隙处固液两相流场分布及其前泵腔磨损特性。分析结果表明:叶轮轴向叶顶间隙泄漏流与主流相互作用,在叶轮流道内产生泄漏涡;泵体磨损强度分布呈螺旋线分布,与实际的泵体磨损情况完全一致。研究结果为渣浆泵的磨损特性的优化提供了理论依据。     

滑片式工质泵两相流制冷系统探究

建立了滑片式工质泵开口尺寸的数学模型,推导出了其最优开口尺寸公式。以滑片式工质泵为核心搭建了两相流制冷系统测试平台,通过变化流量或者功率的方法获得大量实验数据,借助作图分析法初步验证两相流制冷系统的特点,为进一步研究提供实验依据。     

固液两相流泵性能参数影响实验

在工业生产领域中,固液两相流泵是运用普遍的流体机械。泵的性能参数影响泵的效率与使用寿命,基于此,研究固液两相流的介质特性和泵结构参数对泵性能参数的影响,对测试系统中的硬件、软件系统、试验管路、关键仪器仪表的选择进行了设计搭建。利用由Lab VIEW与PLC组成的固液两相流泵性能参数的测试系统,完成固液两相流泵性能参数影响因素的判定。     

固液两相流泵装置汽蚀余量计算

从液相的能量出发,推导了固液两相流泵装置汽蚀余量方程。利用具体计算实例,分析了固相对泵装置汽蚀余量的影响。结果表明,固相密度、体积浓度对泵装置汽蚀余量影响较大。固相颗粒直径的影响相对小些。     

固液两相流泵的研究热点和进展

重点阐述了固液两相流泵的研究现状。从内部的流动规律、泵的性能优化、泵的设计、泵的研究手段四个方面进行了综述。最后提出了4个可行研究方向。     

离心式固液两相流泵清水和浆体实验研究

通过对固液两相流泵进行的清水和浆体实验,证明了按固液两相流动理论设计的渣浆泵是高效、节能型产品。其有关理论和实验数据,尚需进一步实验研究。     

Numerical simulation and analysis of solid-liquid two-phase flow in centrifugal pump

The flow with solid-liquid two-phase media inside centrifugal pumps is very complicated and the relevant method for the hydraulic design is still immature so far.There exist two main problems in the operation of the two-phase flow pumps,i.e.,low overall efficiency and severe abrasion.In this study,the three-dimensional,steady,incompressible,and turbulent solid-liquid two-phase flows in a low-specific-speed centrifugal pump are numerically simulated and analyzed by using a computational fluid dynamics(CFD) code based on the mixture model of the two-phase flow and the RNG k-two-equation turbulence model,in which the influences of rotation and curvature are fully taken into account.The coupling between impeller and volute is implemented by means of the frozen rotor method.The simulation results predicted indicate that the solid phase properties in two-phase flow,especially the concentration,the particle diameter and the density,have strong effects on the hydraulic performance of the pump.Both the pump head and the efficiency are reduced with increasing particle diameter or concentration.However,the effect of particle density on the performance is relatively minor.An obvious jet-wake flow structure is presented near the volute tongue and becomes more remarkable with increasing solid phase concentration.The suction side of the blade is subject to much more severe abrasion than the pressure side.The obtained results preliminarily reveal the characteristics of solid-liquid two-phase flow in the centrifugal pump,and are helpful for improvement and empirical correction in the hydraulic design of centrifugal pumps.     

多台矿用潜水电泵并列布置吸入条件的数值模拟分析

采用计算流体力学的方法,对流量分别为275、550、725、1100、1450m3/h的井内2台潜水泵同时工作时的入口外部流场进行了数值模拟,根据速度场的分布以及涡流情况来确定不同流量时两泵工作时的吸入条件。数值模拟结果表明,平行安装与错位安装时的2台泵吸水管过滤网中心线之间的距离、错位安装时吸水管过滤网的高度差要求随着流量的增大而增大,而吸水管滤网下缘与井底的距离、吸水管滤网中心线与矿井内壁的距离随着流量的增大变化较小。     

NUMERICAL SIMULATION OF 3-D DENSE SOLID-LIQUID TWO-PHASE TURBULENT FLOW IN A NON-CLOGGING MUD PUMP

A mathematical model is set to evaluate the 3-D dense solid-liquid two-phase turbulent flow in a non-clogging mud pump, the flow feature in the impeller channel is simulated with the tool of IPSA. Meanwhile, resort to TECPLOT as the post-processor, the simulation results is visualized. The results show the main flow characteristics: There exists backflow and aberrant velocities at inlet area and a relative velocity slip between two phases; A jet-wake flow pattern is discerned around the shroud-suction side area; The relative velocity vector of solid phase is closer to the pressure surface than that of liquid phase and the trend is more obvious with the increase of diameter; The kinetic energy of turbulence k and the dissipation rate s reach their peaks at the corner of pressure and suction surface. The simulation results show a good agreement with the experimental flow features in the impeller channel, which prove the turbulent model used is valid and provide a theoretical design basis to non-clogging pu     

并联柱塞泵水射流系统的研制和工程应用

水射流雾化制粉工艺和冷态钢材的磨料水射流除除鳞除锈工艺是典型的并联水射流系统工程应用,系统的流量脉动直接影响系统的工艺应用。本文介绍了上述2种典型并联水射流系统的研制,分析总结了泵的相位偏角差值对并联柱塞泵水射流系统流量脉动影响,认为泵之间存在最佳相位偏角使并联柱塞泵水射流系统的流量脉动率得到降低。     

凸轮和齿扇齿条复合驱动的新型往复泵仿真及分析

针对传统往复泵结构复杂、流量波动较大、凸轮驱动往复泵寿命短等问题,提出了一种凸轮和齿扇齿条复合驱动的新型往复泵,凸轮机构和齿扇齿条机构的交替工作驱动该往复泵的活塞做往复运动,使活塞呈现匀加速—匀速—匀减速的运动规律。建立了活塞的运动方程,并以三缸往复泵为例分析了往复泵的流量特性和相位误差角对流量脉动的影响,建立了凸轮和齿扇齿条复合驱动的三缸往复泵的动力学仿真模型,讨论了液力端载荷作用下活塞的运动特性。研究结果表明:凸轮和齿扇齿条复合驱动的三缸往复泵的流量脉动率仅为1.68%,已经达到曲柄滑块机构往复泵有空气包作用时的效果;相位误差对流量脉动存在一定影响,其大小应控制在±30′以内。仿真结果验证了所提出的凸轮和齿扇齿条复合驱动的新型往复泵的合理性与可行性。     

基于耦合补偿的往复泵同步控制

系统地阐述了电机驱动往复泵输送矿浆峰值分散技术,在分析单台往复泵流量脉动及压力脉动产生原因的前提下,论述了多台泵向同一管路输送矿浆时产生峰值叠加的原因及消除峰值叠加的两个条件,识别最佳分散相角值。针对现有多电机泵协调输送系统,采用电机轴相关的同步控制策略,提出了基于耦合补偿的同步控制策略实现输送矿浆峰值分散。     

PERFORMANCE CHARACTERISTICS AND VISCOUS FLOW ANALYSIS OF CENTRIFUGAL PUMPS

ＰＥＲＦＯＲＭＡＮＣＥＣＨＡＲＡＣＴＥＲＩＳＴＩＣＳＡＮＤＶＩＳＣＯＵＳＦＬＯＷＡＮＡＬＹＳＩＳＯＦＣＥＮＴＲＩＦＵＧＡＬＰＵＭＰＳＰＥＲＦＯＲＭＡＮＣＥＣＨＡＲＡＣＴＥＲＩＳＴＩＣＳＡＮＤＶＩＳＣＯＵＳＦＬＯＷＡＮＡＬＹＳＩＳＯＦＣＥＮＴＲＩＦＵＧ...     

Fluid Pump Using a Bar-shaped Piezoelectric Transducer

There are two kinds of piezoelectric pumps:check valve pumps and valve-less pumps.Whether to use a check valve or not depends upon the application occasion.To achieve large backpressure for higher flow rates,the pump with check valve is desirable.However,adding check valves implies more complex structure and higher probability of valve blocking,etc.In order to solve the problem,effective driving and transport mechanics with compact construction and reliable service are being sought.In this paper,using the second-order longitudinal vibration mode of a bar-shaped piezoelectric vibrator for driving fluid,a piezoelectric pump is successfully made.The proposed piezoelectric pump consists of coaxial cylindrical shells and a bar-shaped piezoelectric vibrator,which has a disk part and a cone part.The lead zirconium titanate ceramic rings fixed in the vibrator are polarized along the thickness direction.When the second-order longitudinal vibration of the vibrator along its axis is excited,the disk part of the vibrator changes periodically the volume of the chamber and the cone part acts as a pin valve,driving the fluid from the inlet port to the outlet port.Finite elements analysis on the proposed pump model is carried out to verify its operation principle and design by the commercial FEM software ANSYS.Components of the piezoelectric pump were manufactured,assembled,and tested for flow rate and backpressure to validate the concepts of the proposed pump and confirm the simulation results of modal and harmonic analyses.The test results show that the performance of the proposed piezoelectric pump is about 910 mL/min in flow rate with a highest pressure level of 1.5 kPa under 400 V peak-to-peak voltage and 51.7 kHz operating frequency.It is confirmed that this bar-shaped piezoelectric transducer can be effectively applied in fluid transferring mechanism of pump through this research.     

Prerotation flow measurement

Different measuring methods relating to the prerotation flow in the entrance pipe of radial pumps are analyzed. The appearance of the prerotation flow is a result of the complicated fluid flow model, which appears as a consequence of the pump operating out of design limits and reduces pump efficiency. The goal of this contribution is in estimating the best measuring method, taking into account the inconvenience of conventional hot-wire and laser-Doppler anemometry. Therefore, two measuring systems—multiblade (ASB) and single blade (ASSB) anemometer—are introduced, analyzed and compared. The advantages of the introduced measuring system—ASB—are in its simple construction and simple use and its low price. The direction and swirl flow intensity in the entrance pipe of radial pumps and fans could be measured using this method.     

四腔并联压电泵结构设计

为提高压电泵的输出性能,设计了一种层叠型四腔并联有阀压电泵。在80 V正弦交流电驱动下,40~400 Hz工作频率内,以水和空气作为介质,分别选用不同数量的压电振子进行驱动,在不同的驱动方式(指振子间工作时的相位差)下对泵的输出性能进行试验测试。结果显示,当泵送空气时,不管多少个振子进行驱动,驱动方式对泵的输出流量几乎不产生任何影响,在测试频率范围内,输出流量随频率成线性变化,最大输出气体流量可达3600 mL/min;当泵送液体时,驱动方式对泵的输出流量影响很大,当同侧的压电振子为异步驱动时,输出流量的效果更好,在工作频率180 Hz时,最大输出液体流量可达830 mL/min。试验结果为多振子驱动压电泵选择合适的振子间驱动方式提供了参考依据。