共查询到20条相似文献,搜索用时 93 毫秒
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该文阐述了锅炉给水控制的特点,并对给水控制系统设计的主要问题进行了分析。文中介绍了给水的几种控制方式,特别对现代大功率单元机组采用小汽轮机带动给水泵以及数字式控制系统的方案作了较详细的叙述,为设计提供了参考。 相似文献
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汽包锅炉状态前馈-反馈给水控制 总被引:2,自引:0,他引:2
根据汽包锅炉给水被控对象动态特性的特点,提出了汽包锅炉状态前馈-反馈给水控制方案。仿真实验表明:该控制方案比目前的串级给水控制方案控制效果好,能进一步提高系统的控制品质。 相似文献
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本文研究了互联系统的分散自校正鲁棒控制;在互联项和参数扰动有限的情况下给出了自适应算法以及收敛性和系统的稳定性定理,将该控制方案在有水和电联系的两台水轮机调节中应用,仿真结果证实了该控制方案的有效性。 相似文献
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水电站多机组的分散预测控制器研究 总被引:1,自引:0,他引:1
本文提出一种适于多水轮机系统的分散预测控制策略。分散控制结构能满足实际系统的物理要求,每一机组采用性能优良的水压转速联合预测控制器,并把因分散化所丢失的机组间的关联信息通过设计一扰动观测器加以补偿。通过对有水力联系的两水轮机组带孤立负荷时的仿真结果表明,这种分散预测控制器可使系统具有优良的动态响应过程。 相似文献
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LU Yuan-Wei HE An-Ding WANG Yue-She ZHOU Fang-De 《热科学学报(英文版)》2001,10(2):139-143
IntroductionGas-liquid flow in pipes may aPPear in variousconfigUrations detennined by the spatial distribution ofthe twO Phase in the pipes. These coal~ons aretermed as flow patterns. Slug flow eaistS over a broadrange of gas and liquid flow rates and is encountered in awide vallely of industrial aPPlications.lh venical slug flow, most of thp gas is located inlarge bullet{shaped bubbles, the so called Taylor bubbles,Which occupy most of the pipe cross section. The liquidconfined betWeen … 相似文献
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Jianjun Liu Guanghui ZhongInstitute of Engineering Thermophysics Chinese Academy of Sciences P.O. Box Beijing China 《热科学学报(英文版)》2003,12(2):162-166
This paper describes the numerical simulation of unsteady flows due to incoming wakes and/or varying back pressure. The solution method is based upon the one-step finite-volume TVD Lax-Wendroff scheme. Dual time-step approach and multigrid algorithm are adopted to improve the computational efficiency of the baseline scheme. Numerical results for the transonic unsteady flow in a channel bump and the unsteady flow in a flat plate cascade and the VKI cascade are presented. 相似文献
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本文针对电力系统电力电量平衡中典型日负荷图上安排各电站工作位置问题(即生产运行方式设计)提出了一种分解变换模式,有效地克服了现有方法的局限性。根据该模式,本文建立了电力系统运行方式优化模型。 相似文献
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The effect of pressurized air inlets in the reservoir upstream of the annular slit on characteristics of the axial and tangential velocity components is investigated numerically, and the mechanism of occurrence of spiral nozzle flow is clarified. In simulations, Unified Platform for Aerospace Computational Simulation (UPACS) is used. The governing equations under consideration are the unsteady compressible Navier - Stokes. A second-order finite volume scheme with MUSCL (Roe scheme) is used to discretize the spatial derivatives, and a second order-central difference scheme for the viscous terms, and a MFGS (Matrix Free Gauss Seidel) is employed for time integration. Spalart-Allmaras model was used as a turbulence model. The results obtained are compared with velocity distributions in the experiment measured by the two-component fiber optic laser Doppler velocimeter system. The existence of discrete pressurized air inlets that leads to the occurrence of asymmetrical characteristics is a very important factor for the formation of spiral flow. 相似文献