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国家自然科学基金(50909076)

作品数:10 被引量:58H指数:4
相关作者:李进平杨建东赖旭付亮鲍海艳更多>>
相关机构:武汉大学湖南省电力试验研究院更多>>
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相关领域:水利工程动力工程及工程热物理交通运输工程更多>>

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10 条 记 录,以下是 1-10
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灯泡式水轮机三维过渡过程CFD模拟
灯泡式水轮机流道短,流动三维特性明显,用一维方法计算其过渡过程难以满足要求,三维计算势在必行。三维模拟的关键问题是导叶大幅运动及转轮变速的处理。本研究旨在利用CFD商用软件FLOW-3D中先进的流固耦合技术解决这些问题,...
张晓曦程永光
关键词:灯泡式水轮机CFD模拟
文献传递
变顶高尾水洞明满混合流流态分析被引量:3
2010年
针对水电站变顶高尾水洞中恒定流条件下明满混合流的界面呈小范围的来回波动现象,采用无压隧洞充蓄度和气液两相流界面稳定理论分析该流态。结果表明,明满混合流界面处局部的水流不稳定段客观存在,但不可能形成全洞长明满流交替和滞气现象,且基于气液两相流界面稳定理论获得的计算值与试验值吻合,为变顶高尾水洞优化设计提供了理论和计算方法支撑。
李进平杨建东
关键词:变顶高尾水洞气液两相流无压隧洞明满流计算值恒定流
尾水调压室水电站调节系统动态品质研究被引量:7
2010年
目前水电站的调节品质已成为水电界所关注的一个重要问题。本文从基本方程出发,分析了带尾水调压室水电站负荷扰动下调节系统的调节品质,得出了机组频率尾波波动过程调节时间的计算方法。最后通过计算实例,研究了调速器参数、调压室面积及尾水隧洞水流惯性对调节系统动态品质的影响。
付亮李进平杨建东鲍海艳
关键词:水力学调压室
3-D simulation of transient flow patterns in a corridor-shaped air-cushion surge chamber based on computational fluid dynamics被引量:3
2013年
The 3-D characteristics of the water-air flow patterns in a corridor-shaped air-cushion surge chamber during hydraulic transients need to be considered in the shape optimization. To verify the reliability of the water-air two-phase model, namely, the volume of fluid model, the process of charging water into a closed air chamber is successfully simulated. Using the model, the 3-D flow characteristics under the load rejection and acceptance conditions within the air-cushion surge chamber of a specific hydro- power station are studied. The free surface waves, the flow patterns, and the pressure changes during the surge wave process are analyzed in detail. The longitudinal flow of water in the long corridor-shaped surge chamber is similar to the open channel flow with respect to the wave propagation, reflection and superposition characteristics. The lumped parameters of the 3-D numerical simulation agree with the results of a 1-D calculation of hydraulic transients in the whole water conveying system, which validates the 3-D method. The 3-D flow structures obtained can be applied to the shape optimization of the chamber.
夏林生程永光周大庆
基于水电站调节品质的调压室设置条件探讨被引量:5
2011年
调压室设置条件是水电站初步设计的重要判据之一。本文在刚性水击的前提下,推导了基于文献[11]的最优调节品质条件下的机组转速波动方程,得出机组转速波动特征参数计算表达式,继而从理论上推导出满足调节品质的调压室设置判别式。在推导过程中得出机组转速波动幅值仅与Tw/Ta有关,衰减度为定值,进而说明水电站调节品质主要由Tw/Ta值决定。最后结合工程实例与其它调压室设置判据进行对比分析,得出中、高水头水电站是否设置调压室的允许Tw值由调保参数来决定;而低水头水电站的允许Tw值则由水电站调节品质来决定,同时还得出水电站满足调节品质比满足稳定性要求更严格。
鲍海艳杨建东付亮李进平
关键词:水力学调压室
发电机电磁过程对带孤立负荷运行的水电站过渡过程的影响被引量:3
2013年
在水电站引水发电系统过渡过程研究中,一阶发电机模型未能反映电磁过程的影响,而三阶和五阶模型中计入电磁过程,能更好地模拟引水发电系统的过渡过程.在建立水力、机械、电气系统联合仿真模型的基础上,研究分析了使用一阶、三阶、五阶发电机模型时电站的小波动过渡过程.结果表明:使用一阶发电机模型的过渡过程与三阶、五阶模型的结果有较大差别,三阶模型与五阶模型的结果十分接近,即在水电站过渡过程中应考虑电磁影响.在长引水式水电站过渡过程中,一阶模型与三阶模型的差别更大.
邹金赖旭宗欣
关键词:同步发电机引水管道
SIMULATION OF HYDRAULIC TRANSIENTS IN HYDROPOWER SYSTEMS USING THE 1-D-3-D COUPLING APPROACH被引量:22
2012年
Although the hydraulic transients in pipe systems are usually simulated by using a one-dimensional (l-D) approach, local three-dimensional (3-D) simulations are necessary because of obvious 3-D flow features in some local regions of the hydropower systems. This paper combines the 1-D method with a 3-D fluid flow model to simulate the Multi-Dimensional (MD) hydraulic transients in hydropower systems and proposes two methods for modeling the compressible water with the correct wave speed, and two strategies for efficiently coupling the 1-D and 3-D computational domains. The methods are validated by simulating the water hammer waves and the oscillations of the water level in a surge tank, and comparing the results ~with the 1-D solution data. An MD study is conducted for the transient flows in a realistic water conveying system that consists of a draft tube, a tailrace surge tank and a tailrace tunnel. It is shown that the 1-D-3-D coupling approach is an efficient and promising way to simulate the hydraulic transients in the hydropower systems in which the interactions between 1-D hydraulic fluctuations of the pipeline systems and the local 3-D flow patterns should be considered.
ZHANG Xiao-xiCHENG Yong-guang
2个U型组合的90°4片弯管的局部水头损失及相互影响被引量:3
2013年
2个U型组合的90°4片弯管流场非常复杂,确定其水头损失和相互影响系数不容易,一般水力计算手册中对此也尚乏介绍.采用计算流体动力学理论和计算方法,在验证了数学模型和网格划分方法可行性和准确性的前提下,模拟了2个U型组合的90°4片弯管流场并计算了该管段的局部水头损失,分析了相互影响系数随Ls/D的变化规律.研究表明:增大转弯半径可以减小局部水头损失;减小2个90°4片弯管间的直管长度可以减小局部水头损失;相互影响系数随Ls/D增大而不断趋近1.0;若R/D≥1,则当Ls/D等于0时,该值取得最小,局部水头损失也最小.
唐博李进平罗文
关键词:弯管局部水头损失数值模拟
冲击式水轮机最大水锤压力控制工况研究被引量:3
2013年
通过理论分析得到了能够反映冲击式水轮机喷嘴相对开度与喷针相对行程关系的近似公式,采用喷嘴工作特性试验结果与多种机型的模型特性曲线验证了该公式的准确性。该公式比目前的线性喷嘴过流公式更能反映喷嘴的过流特性。在此基础上,针对冲击式水轮机最大水锤压力并非出现在额定工况的现象,提出一种水锤坐标分析方法,得到喷针直线关闭规律下最大水锤压力的控制工况及其解析计算公式。
游秋森赖旭李婷婷钟全胜梁斌
关键词:水力机械冲击式水轮机
Simulation of the load rejection transient process of a francis turbine by using a 1-D-3-D coupling approach被引量:14
2014年
This paper presents the simulation and the analysis of the transient process of a Francis turbine during the load rejection by employing a one-dimensional and three-dimensional (1-D-3-D) coupling approach. The coupling is realized by partly overlapping the I-D and 3-D parts, the water hammer wave is modeled by defining the pressure dependent density, and the guide vane closure is treated by a dynamic mesh method. To verify the results of the coupling approach, the transient parameters for both typical models and a real power station are compared with the data obtained by the 1-D approach, and good agreements are found. To investigate the differences between the transient and steady states at the corresponding operating parameters, the flow characteristics inside a turbine of the real power station are simulated by both transient and steady methods, and the results are analyzed in details. Our analysis suggests that there are just a little differences in the turbine outer characteristics, thus the traditional 1-D method is in general acceptable. However, the flow patterns in the spiral casing, the draft tube, and the runner passages are quite different: the transient situation has obvious water hammer waves, the water inertia, and some other effects. These may be crucial for the draft tube pul- sation and need further studies.
张晓曦程永光杨建东夏林生赖旭
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