摘要
对现有的分段低压输水系统水力振荡特性分析方法进行了探讨比较,并分析了各种方法的优缺点。经比较分析可知:传统的特征线法和隐格式法主要用于系统水力振荡的时域分析;U形管模型法只考虑了水体的刚性,而忽略了水体弹性;压力管道内水体采用精确模型只适用于系统的频域分析。采用基于水力振动理论的压力管道线弹性模型,是用于分段低压输水系统水力振荡特性分析的新的研究方法,该方法可对系统同时进行时域分析和频域分析,而且能够较准确地反映压力管道内水体的高阶振荡特性,相比其他方法更具优越性。
The existing analysis methods for hydraulic oscillation characteristics of stepped low-pressure water conveyance system are discussed and compared herein, from which it is known that the conventional method of characteristics and the preissmann implicit method are mainly applied to the analysis on the time domain of the hydraulic oscillation. However, the method of the Ushaped tube model only considers the rigidness of the flowing water, yet neglects the elasticity of it, and furthermore, the accurate model applied to the flowing water inside of the pressurized pipeline is only suitable for the frequency domain analysis of the sys- tem. Nevertheless, the application of the hydraulic vibration theory based linear elastic model of the pressurized pipeline is just a new method for the analysis on the hydraulic oscillation characteristics of the stepped low-pressure water conveyance system, with which both the analyses of the time domain and the frequency domain can be made simultaneously, and then the higher-order oscillation characteristics of the flowing water inside of the pressurized pipeline can be more accurately reflected. Compared with the other methods concerned, this method is more advantageous.
出处
《水利水电技术》
CSCD
北大核心
2011年第10期58-61,共4页
Water Resources and Hydropower Engineering
基金
国家自然科学基金资助项目(51079051
90610027)
中央高校基本科研业务费专项资金资助项目(2010B01714)
关键词
分段低压输水系统
水力振荡
特征线法
线弹性模型
stepped low-pressure water conveyance system
hydraulic oscillation
characteristic method
linear elastic model
