威力巴流量计在高炉煤气流量测量上的应用

介绍一种新颖的差压式流量计，阐述了威力巴流量计的工作原理、基本结构、性能特点，分析了威力巴流量计在高炉煤气流量测量上比其它节流装置所具有的优势。     

威力巴流量计在高炉煤气流量上的应用

介绍一种新颖的差压式流量计,阐述了威力巴流量计的工作原理、基本结构、性能特点，分析了威力巴流量计在高炉煤气流量测量上比其它节流装置所具有的优势。     

浅谈威力巴流量计的应用

分析了工业上常用的孔板差压式流量计的结构特点，介绍一种新型的插入式差压流量计，即威力巴流量计，简述其工作原理、结构特点和应用情况，并将两者做了比较，突出了威力巴流量计的优越性。     

新型插入式双V型流量计优化设计及数值模拟

基于插入式流量计差压原理与安装方式,设计了一种新型插入式双V型流量计。在不同的流速条件下,对400mm口径管道新型流量计进行数值模拟。引用k-ε湍流模型及SIMPLIC算法进行计算,得到了流量系数随速度的变化规律。以威力巴流量计作为参照对象进行同等条件下的数值模拟,将二者特性进行对比分析。结果表明:新型插入式双V型流量计集合了威力巴流量计与文丘里管的优势,大幅度提升了输出压差,压损比较威力巴降低了7.7%,扩大了低速稳定范围,其性能更优。     

威力巴流量计的应用

本文介绍了利用威力巴这种新型的差压式流量探头作为流量测量的核心部件,配以高性能的变送器和二次积算显示仪表,组成一套流量测量系统测量蒸汽流量。     

双体均速管流量计的创新优化设计

基于流动控制原理,将文丘里效应应用到均速管流量计中,建立了几种双体均速管模型。通过数值分析不同模型的流量系数及其引起的永久压损随速度的变化规律,并与威力巴原型进行比较,从中选取最优模型。     

一种新式差压流量计的设计与应用

该文分析了影响蒸汽流量准确计量的主要因素,介绍了传统的蒸汽流量计如孔板流量计和涡街流量计的使用局限性,详细介绍了一种基于皮托管原理的新式差压式流量计的设计原理、结构特点及其标定方法,通过实例给出了典型蒸汽工况下选择流量计的考虑因素,以及应用这种新式差压式流量计的选型和计算过程。     

双向流量测量在石化企业的应用

本文介绍了双向流量计的原理、分类和使用场合,并通过同单向流量计的比较,指出双向流量计在测量精度、成本等方面的优缺点,最后提出选择、使用双向流量计的注意事项。     

巴类流量计的设计安装与应用

本文介绍了巴类流量计的测量原理,计算公式和安装结构,从介质物性参数、巴类流量计选择、流量范围设置、地址信息填写和巴类计算书应用几个方面详细分析了巴类流量计计算软件DeltaCalc进行计算的过程。巴类流量计由于测量准确度高、重复性好、现场实用性强等诸多优点,可以较好地实现工业现场的流量计量。     

均速管流量计优化设计的数值模拟

根据流体力学计算方法,对300 mm口径管道对应的均速管流量计进行二维数值模拟,采用k-ωSST湍流模型及SIMPLE算法,首先得到均速管流量计流量系数随速度的变化特性;在其基础上,创新设计了一种新型的双体均速管流量计,这种新型均速管流量计较传统的威力巴流量计而言,在压力损失有限增加的前提下,能产生更高的输出压差和更低的流量系数.     

ICEPAK在三相PWM变流器模块散热分析中的应用

散热器的设计和散热分析是三相PWM变流器设计的关键技术.本文利用CFD软件ICEPAK分析了三相PWM变流器模块的散热性能,探讨了影响散热性能的各个因素.结果表明:散热器的换热系数随着风速的增大而增大,压力系数则越来越小.散热器的肋片数以及肋片厚度的增加导致流通面积变小,压力系数增大,换热系数逐渐增大.     

差压式涡街质量流量计取压位置的研究

在涡街流量计中，流体通过涡街发生体后会产生压力损失及由旋涡引起的压力波动，根据这一特点，本文提出利用差压检测技术，通过单路差压传感器同时感受由涡街发生体引起的流体双重变化特性，测量流体质量流量的新方法。本文重点对差压检测取压位置进行研究，利用空气和水两种流体介质进行了一系列实验，得到不同取压位置的差压信号与流量关系，确定了能正确测量质量流量的差压取压位置。结果表明，该测量方法结构简单，是测量质量流量的有效方法。     

流量开关在中央空调系统中的应用研究

分析了中央空调水系统中靶式流量开关、压差式流量开关安装和使用特性,研究了压差式流量开关在中央空调水系统的应用,得出了压差式流量开关是中央空调机组水流控制最优选择的结论。     

PDA技术应用在风机动叶流场测量中的几个问题

介绍了激光相位多普勒测速（PDA）技术在轴流风机动叶内部流场测量中的应用，对于影响测量精度和效率的几个关键问题，如测量窗口的形式的选择、散射粒子的选择、散射粒子加入方式的选择、测量盲区的克服、流动噪音的处理等，进行了分析讨论。结合实践经验提出了一些切实可行的解决办法并得到了较好的测量结果。     

Unsteady air flow measurement method based on adaptive tracking differentiator for pneumatic system

When using a flowmeter to measure unsteady air flow in the pneumatic control system, problems such as high cost and pressure loss are often encountered. It is an available method to measure the unsteady flow rate using isothermal chamber through direct differentiation of pressure signal with a traditional fixed parameter differentiator, but the adaptability of this method is insufficient due to its narrow dynamic range. To this end, an improved adaptive tracking differentiator which can adaptively adjust the control parameters according to the changes of pressure signal and pressure tracking error was proposed for unsteady air flow measurement. The algorithm structure of the adaptive tracking differentiator was designed. Moreover, theoretical simulation and flow measurement experiments under multiple working conditions were carried out. The simulation and experiment results showed that the flow measurement method based on improved adaptive tracking differentiator effectively measured the unsteady flow in a wide dynamic range, and had the advantages of more simplified process and lower cost than traditional method.     

自动磨削机磨削控制方法的研究

针对自动磨削机的工作要求,采用恒压力控制法对磨削进行自动控制,分析并给出院砂轮正压力的检测方法及恒压力的控制流程图。     

压磁电感式汽车电喷发动机进气压力传感器的研究

为准确检测汽车电喷发动机进气压力,对一种利用Fe基非晶态合金压磁效应实现发动机进气压力检测的方法进行了可行性研究.首先,设计了一种膜片压磁电感式压力传感器,论述了这种传感器的结构、工作原理、输出特性以及主要参数的选择.然后,通过试验,分析了传感器的静态特性以及温度对输出的影响.试验结果表明,文中设计的传感器最大静态误差为1.17%,最大灵敏度为0.737 4 mV/kPa,温度零点漂移为0.936%F·S/℃.另外,传感器结构简单、工作可靠、温度稳定性高,用于检测发动机进气压力是可行的.     

Measurement of fluid flow rate using nanocomposite silicone rubber sensor

This paper describes the use of an elastic nanocomposite sensor to measure the water flow rate in open and closed hydraulic circuits. A sensor was constructed of multiwalled carbon nanotubes (MWCNTs) dispersed in silicone rubber (SR) and subsequently tested to verify its ability to measure water flow rate. The results reveal that the correlation between the fluid flow rate and the pressure variation across the sensor entails that its electrical resistance can be correlated to the flow rate. The sensor constructed of 2 and 3 wt,% of MWCNTs in SR-based nanocomposite sensors exhibited a low percolation threshold. An electron microscope (HRSEM) was used to characterize the manufactured nanocomposite sensors and confirm the conductive networks. The variation in the electrical resistance of the sensor in terms of both water pressure and flow rate is described. The elastic sensor was calibrated to measure the water flow rate in the range of 0–35 l/min. The results show that an elastic sensor fabricated from MWCNTs dispersed in silicone rubber does exhibit sensitivity to the slight strain levels produced by dynamic water pressure and, as such, can be used to measure flow rate. In addition, the sensor's response to water flow in the presence of bubbles enables pump cavitation monitoring. This paper also investigates the reduction of sensor electrical conductivity in response to water immersion. The findings reveal that the elastic nanocomposite sensor could potentially be used as a liquid sensor to detect water leakage in hydraulic circuits.     

Performance curve available for non-steady flow through Venturi-like reverse flow diverter

A reverse flow diverter (RFD) consists of a driving nozzle, a diffuser, and a suction gap that separates the nozzle and diffuser. Thus, the RFD is a Venturi-like fluidic component with three ports. The jet flow emanating from the driving nozzle exit can entrain the ambient fluid and transport it to a high elevation. During this time, the flow through the RFD is non-steady, which makes it difficult to measure the flow depending on the pressure drop. In this study, a series of tests was carried out to evaluate this fluid flow with different contraction ratios, suction gap lengths, fluid properties, inlet flow rates, and inlet pressures. A performance curve was formulated that can be expressed as an exponential equation correlating the non-dimensional Euler number, pressure ratio, and suction factor. The performance curve is not affected by the driving nozzle exit diameter and suction length of the RFD. The performance curve makes it possible to measure the flow out of a RFD depending on the pressure drop.     

深海悬浮物过滤薄膜过流能力与压力损失研究

专门设计了一种测量筒体内薄膜过流能力装置,指出在深海条件下影响取样器过滤薄膜过流能力和压力损失的因素,并在实验结果的基础上运用MATLAB对其进行了仿真研究,讨论了过流条件下试压泵等因素引起的管道流体压力脉动现象。