泵站虹吸式出水流道参数化设计

发布时间：2018-05-28 19:24

本文选题：虹吸式出水流道 + 数值模拟　；参考：《扬州大学》2017年硕士论文

【摘要】：随着我国城镇化建设进程的加快,洪涝灾害和水环境恶化等问题也随之加剧。为了更好地应对出现的问题,需要建设大批大型泵站。出水流道作为低扬程泵站的重要组成部分,如果流道内流态不良,会降低泵装置效率,甚至会威胁泵站的安全运行。虹吸式出水流道利用虹吸原理,断流方式简单可靠,但是工程投资较大,且断面形状复杂,设计尺寸不当易引起机组振动等不良现象。在我国已建的大型低扬程泵站中出水流道很多采用虹吸式,因此,本文选择研究优化虹吸式出水流道的水力性能具有重要的理论意义和实用价值。工程中设计出水流道往往需要设计人员花费大量的时间去绘制单线图。如果能够设计一个界面,用户只要提供流道主要控制尺寸就能得到相关单线图,这样就大大提高了流道绘制效率。因此,对出水流道的参数化二维绘图软件设计具有一定的工程实用价值。本文的内容分为两部分.:第一部分是虹吸式出水流道优化设计研究,第二部分是流道的二维参数化绘图软件设计研究。虹吸式出水流道水力优化设计研究采用了流体力学Navier-Stokes方程和标准k-ε湍流模型对虹吸式出水流道进行了数值模拟研究,其主要内容是:分析比较了虹吸式出水流道几何参数对流道水力性能的影响,包括:上升段倾角、驼峰断面高度、下降段倾角和出口断面宽度。在这些几何参数中,流道水头损失随着上升段倾角α的增大而呈现先逐渐减小后逐渐增大的趋势。驼峰断面高度对流道影响很大,随着驼峰断面高度H2的增大,流道水头损失是先减小后逐渐增加的。但由于流道驼峰断面高度的选择还要兼顾土建投资,所以也不宜过大,宜取在H2 =0.88D0左右。下降段倾角除了对流道水力性能有影响,还对工程土建投资有较大影响。下倾角值越大,流道水头损失就越大。出口断面宽度B3过大会引起虹吸式出水流道水头损失的明显增加,在B3大于2.31D0时,B3与水头损失关系没有明显影响。在二维参数化绘图软件设计部分采用某种虹吸式出水流道线型设计方法,编制了设计主程序(主要由上升段、驼峰段、下降段和出口段四个部分组成)。以AutoCAD绘图软件作为绘图平台,运用Visual Basic语言与其做接口,编制了绘制虹吸式出水流道剖面图、俯视图。为了研究虹吸式出水流道几何参数和水力损失之间的函数关系,利用VB语言和MATLAB语言混合编程和多元回归模型,得到拟合方程和残差图。
[Abstract]:With the acceleration of urbanization construction in China, the flood disaster and water environment deterioration are also aggravated. In order to better deal with the problems, a large number of large pumping stations need to be built. As an important part of low head pumping station, the outlet flow channel will reduce the efficiency of pump device and even threaten the safe operation of pump station if the flow state is not good. The siphon outlet runner is simple and reliable by siphon principle, but the project investment is large, the section shape is complex, and the design size is not suitable, which will easily cause the unit vibration and other bad phenomena. Siphon type is often used in the outlet passage of large low lift pumping station in China. Therefore, it is of great theoretical significance and practical value to study and optimize the hydraulic performance of siphon outlet channel in this paper. The design of outlet runner often takes a lot of time to draw a single line diagram. If an interface can be designed, the user can get the relative single-line graph only by providing the main control size of the flow channel, which greatly improves the efficiency of the channel rendering. Therefore, the parameterized two-dimensional drawing software design of outlet channel has certain engineering practical value. The content of this paper is divided into two parts: the first part is the research on the optimal design of the siphon outlet channel, and the second part is the research on the two-dimensional parametric drawing software design of the channel. Study on hydraulic Optimization Design of siphon outlet Channel numerical simulation of siphon outlet passage was carried out by using hydrodynamic Navier-Stokes equation and standard k- 蔚 turbulence model. The main contents are as follows: the influence of the geometric parameters of the siphon outlet passage on the hydraulic performance of the channel is analyzed and compared, including the inclination angle of the rising section, the height of the hump section, the dip angle of the descending section and the width of the outlet section. Among these geometric parameters, the head loss of the channel decreases at first and then increases with the increase of the angle 伪 of the rising section. The hump section height has a great influence on the flow passage. With the increase of the hump section height H _ 2, the head loss of the passage decreases first and then increases gradually. However, due to the selection of the height of the hump section of the flow channel, the civil construction investment should be taken into account, so it should not be too large, and should be taken around H _ 2 0.88D _ 0. The dip angle not only has an effect on the hydraulic performance of the runner, but also has a great influence on the civil engineering investment. The greater the downdip, the greater the channel head loss. The loss of head of siphon outlet channel is obviously increased when the width of outlet section B3 is over B3, but the relationship between B3 and head loss is not obvious when B3 is larger than 2.31D0. In the design part of two-dimensional parametric drawing software, a siphon outlet runner line design method is adopted, and the main program is compiled (mainly composed of four parts: rising section, hump section, descending section and outlet section). By using AutoCAD software as the drawing platform and using Visual Basic language as the interface, the drawing of siphon exit passage profile and the top view diagram are compiled. In order to study the functional relationship between geometric parameters and hydraulic loss of siphon outlet, the fitting equation and residual diagram were obtained by using VB and MATLAB language mixed programming and multivariate regression model.
【学位授予单位】：扬州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV675;TV136.2

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