小型水源热泵专用多功能水箱的研究及应用

介绍小型水源热泵专用多功能水箱的原理及结构特点,并在此基础上开发了一种公寓用空调系统.该系统从节能、舒适、环保的角度出发,通过电动三通阀的工作,有机地把热泵、太阳能热水器和地板辐射采暖等各自系统的优点结合起来,满足长江流域不同气候条件的要求.     

余热锅炉上水的稳定控制技术

本文介绍了通过采取疏导式三通阀门控制方案，解决余热锅炉上水的不稳定问题。     

轨道车制动机加装单独制动阀的建议

提出了轨道车H-104分配阀（或三通阀）制动机的改造方法,即加装单独制动阀系统,一并操控平车。     

专利信息

管道排空防冻式太阳热水器本实用新型为一种管道排空防冻式太阳热水器。它由水箱、集热器、支架和水管组成,其特征为水箱与水管间设有二位三通阀,二位三通阀的一个接口与水箱底部接口相接,另一个接口接水管,第三个接口与水箱顶部接口相接,水管上设排空阀门,二位三通阀为平稳式或旋转式。本专利可方便地上凉水、用热水,并可及时排空水管中的余水,从根本上解决了水管冻结的问题,保证了太阳热水器的良好使用性能。(专利权人淄博华扬太阳能热水器有限公司授权公告号CN2469383Y)图1具有辅助加热功能的太阳热水器本实用新型为一种具有辅助加热功…     

采用紧凑式阀门执行机构的汽轮机控制系统

介绍了在汽轮机控制系统中采用的一种紧凑式阀门执行机构的结构和工作原理。由于这种执行机构采用自供油系统，使得该控制系统省去了调节油箱、油管等辅助设备，同时也避免了火灾的危险；单侧充油式油动机采用高压调节油驱动，使得油动机的提升力增大，动作速度提高，机组从负荷时的动态超速降低；控制系统中大范围地采用电子设备，使得机组的自动化程度提高，运行方式灵活，运行性能得到改善。     

EGR流通能力及可靠性考核试验装置的开发

在涡轮增压器压气机特性台架基础上,设计了一套以三通阀为主体的EGR流通能力及可靠性考核试验装置,该套装置的开发圆满完成了EGR阀新品流通及高温可靠性试验,验证了该套装置设计的合理性。     

黔西电厂3号高压加热器振动原因排查

贵州黔西电厂1号机组在启动运行过程中。负荷超过250MW时3号高压加热器及其附近楼板和给水管道发生国内外罕见的振动。分析后认为这些振动源自3号高压加热器．3号高压加热器振动由管束共振引起。共振的激振力来自VHB／3—125T3型给水三通阀。一年后，对3号机组的给水三通阀进行内部改造。振动消除。本文侧重介绍振动原因的排查过程．并介绍了可供工程设计与建设参考的若干体会。     

采用紧养伤式阀门执行机构的汽轮机控制系统

介绍了在汽轮机控制系统中采用的一种紧凑式阀门执行机构的结构和工作原理。由于这种执行机构采用自供油系统，使得该控制系统省去了调节油箱、油管等辅助设备，同时也避免了火灾的危险；单侧充油式油同采用高压调节油驱动，使得油动机的提升力增大，动作速度提高，，机组甩负荷时的动态超速降低，控制系统中大范围地采用电子设备、使得机组的自动化程度提高。运行方式灵活，运行性能得到改善。     

连续循环钻井技术装备与应用

为解决常规钻井在上扣、卸扣时因停止/开始泥浆循环,环空中当量泥浆密度波动较大带来的一系列井下问题,国外开展了连续循环钻井技术研究。所谓连续循环钻井技术,是指在钻井过程中,起下钻接卸单根时,可以不停泵而保持井眼处于连续循环状态的技术。该技术可有效克服因开/停泵造成的井下压力波动,减少因压力波动造成的井下复杂情况及事故,尤其适用于压力敏感井、长水平段水平井、大位移井、深水井、欠平衡井和窄密度窗口井。目前,实现连续循环钻井有两种途径,即采用连续循环钻井系统和连续循环短节技术。连续循环钻井系统采用顶部驱动,利用三重闸板连接器内闸板和旁路管汇的合理开合,保持泥浆不间断流动。连续循环短节技术的研究略晚于连续循环系统,该技术包括二位三通阀短节及快速接头,三通阀短节预先连接在需要连续循环井段的立柱上端,通过转换连接在钻柱中三通阀短节的进液方向,同时配合以旁路循环管线上快速接头与阀短节上侧口的插拔,实现钻井液的连续循环。该工具结构简单,操作灵活,已广泛应用于长水平段水平井、大位移井及高温高压井。     

三通调节阀热冲击过程数值模拟

应用CFD软件FLUENT对运行过程中的热冲击试验系统的三通阀进行了热冲击过程模拟计算,采用Realizable k-ε模型,分析了流场参数分布情况。通过模拟结果分析了承受热冲击的主要部位,针对其易磨损发生泄漏的问题,提出了优化改进方案。     

An extended actuator cylinder model: Actuator‐in‐actuator cylinder (AC‐squared) model

In this paper, the actuator‐in‐actuator cylinder (AC‐squared) model is presented. This model is an extension of the original actuator cylinder model of Madsen and is capable of modelling the effect of a two concentric actuation surfaces in 2D. The induced velocity at every point in the 2D field is affected by the force field acting on the two actuator cylinders. The equations are derived, and a model verification is performed using analytical solutions of flows, proof of flow equivalence, and using OpenFOAM calculations. Finally, the model is applied to different case studies, and the results are compared with a time‐dependent free wake vortex method.     

DSP在电力参数检测系统中的应用

设计了一种基于TMS320F2812DSP电力参数实时检测系统。采用ADS8364对6路信号同时采样,利用复序列FFT算法得到各种电力参数,可由CAN总线与上位机实时传输数据,实现对电力系统的实时、准确的参数测量和数据分析。采用了硬件锁相环技术。可更加有效实现同步采样,提高了采样精度。     

Numerical modeling of the hydraulic blade pitch actuator in a spar‐type floating wind turbine considering fault conditions and their effects on global dynamic responses

This paper deals with numerical modeling of the hydraulic blade pitch actuator and its effect on the dynamic responses of a floating spar‐type wind turbine under valve fault conditions. A spar‐type floating wind turbine concept is modeled and simulated using an aero‐hydro‐servo‐elastic simulation tool (Simo‐Riflex [SR]). Because the blade pitch system has the highest failure rate, a numerical model of the hydraulic blade pitch actuator with/without valve faults is developed and linked to SR to study the effects of faults on global responses of the spar‐type floating wind turbine for different faults, fault magnitudes, and environmental conditions. The consequence of valve faults in the pitch actuator is that the blade cannot be pitched to the desired angle, so there may be a delay in the response due to excessive friction and the wrong voltage, or slit lock may cause runaway blade pitch. A short circuit may cause the blade to get stuck at a particular pitch angle. These faults contribute to rotor imbalance, which result in different effects on the turbine structure and the platform motions. The proposed method for combining global and hydraulic actuator models is demonstrated in case studies with stochastic wind and wave conditions and different types of valve faults.     

增压式高压共轨系统用新型电控增压泵研究

针对增压式高压共轨系统中电控增压泵的性能进行了分析研究,设计了基于两位三通电磁阀的新型电控增压泵,并建立了系统仿真模型,开展了仿真研究。仿真结果表明:新型电控增压泵能使电控增压泵的增压室压力峰值提高15MPa,控制耗油量减小35.2%,能消除增压室压力的振荡现象,且新系统实现的可调喷油率更有利于满足柴油机全工况优化运行的需要。     

Performance simulation of metal hydride based helical spring actuators during hydrogen sorption

Self sensing/actuation materials are known as smart/intelligent materials due to their changes in structure and functionality based on external stimuli. Even though, metal hydrides are studied extensively as potential materials for hydrogen storage, their applicability becomes limited due to low gravimetric storage capacity. However their significant volumetric dilatation upon hydrogenation can make them potential candidates for sensors/actuators. As hydrogenation performance of these alloys is controlled by heat transfer as the major factor, devices based on this can be employed as thermal sensors/actuators. However response characteristics of such devices need detailed investigation. A numerical study is conducted on the performance of these actuator elements with LaNi₅ as the hydrogen storage alloy. Effects of different operational and geometric parameters on hydrogenation and actuator displacement are studied.     

柴油机位置式电子调速系统设计

主要介绍以DSP56F807芯片为ECU单元,以比例电磁铁为执行器的柴油机喷油泵齿条位置反馈控制式调速系统,使用PWM脉宽调制方式控制,设计了外围电路,软件驱动控制程序。进行了模糊PID控制下系统的阶跃响应实验,并将其结果与传统的PID控制方式做了比较。     

A simple improvement of a tip loss model for actuator disc simulations

The loading of a wind turbine decreases towards the blade tip because of the velocities induced by the tip vortex. This tip loss effect has to be taken into account when performing actuator disc simulations, where the single blades of the turbine are not modeled. A widely used method applies a factor on the axial and tangential loading of the turbine. This factor decreases when approaching the blade tip. It has been shown that the factor should be different for the axial and tangential loading of the turbine to model the rotation of the resulting force vector at the airfoil sections caused by the induced velocity. The present article contains the derivation of a simple correction for the tangential load factor that takes this rotation into account. The correction does not need any additional curve fitting but just depends on the local airfoil characteristics and angle of attack. Actuator disc computations with the modified tip loss correction show improved agreement with results from actuator line, free wake lifting line, and blade element momentum simulations.     

Mesh and load distribution requirements for actuator line CFD simulations

Fundamental numerical testing has been carried out to determine mesh density and force distribution guidelines for an actuator line‐based computational fluid dynamics method for simulating kinetic turbines. The method computes forces from lifting surfaces (i.e. wings or blades) by using the evolving flowfield and tabulated airfoil data. The forces are applied to the flow as momentum source terms distributed with a Gaussian smoothing function about the physical locations of the blade/wing quarter‐chord line. The chosen length scale of the Gaussian distribution affects the magnitude and distribution of the resulting induction and necessitates a minimum grid resolution for accurate results. Tests have been conducted to determine appropriate distribution length scales and mesh spacing by using an infinite span wing and finite span wings with constant and elliptical spanwise circulation distributions. These test cases were chosen because they have simple analytical solutions derived from lifting line theory. The eventual goal is to simulate turbine rotors; however, these fundamental test cases provide a means to evaluate the required mesh spacing and the appropriate distribution length scale without the complexity of modeling a turbine rotor wake. It was found that the source distribution length scale ? should be proportional to the local airfoil chord length c with a ratio ? / c of approximately 1/4 and that the mesh spacing at the actuator line should satisfy ? / Δ_grid ≥ 4. This limit is likely somewhat code specific and should be evaluated for all solvers used for actuator line simulations. Copyright © 2012 John Wiley & Sons, Ltd.     

高风温无焰燃烧锅炉原理探讨

介绍了一种基于高风温无焰燃烧的新型锅炉的工作原理;详细讨论了高效烟气余热回收、超低NOX排放等关键技术和蓄热式燃烧器、四通换向阀等关键部件;与传统锅炉相比,不仅具有高效低污染的优点,而且结构也更简单。     

A simple model of the wind turbine induction zone derived from numerical simulations

The induction zone in front of different wind turbine rotors is studied by means of steady‐state Navier‐Stokes simulations combined with an actuator disk approach. It is shown that, for distances beyond 1 rotor radius upstream of the rotors, the induced velocity is self‐similar and independent of the rotor geometry. On the basis of these findings, a simple analytical model of the induction zone of wind turbines is proposed.