發(fā)布時間：2018-05-28 19:24

  本文選題：虹吸式出水流道 + 數(shù)值模擬�。� 參考：《揚州大學》2017年碩士論文

【摘要】：隨著我國城鎮(zhèn)化建設進程的加快,洪澇災害和水環(huán)境惡化等問題也隨之加劇。為了更好地應對出現(xiàn)的問題,需要建設大批大型泵站。出水流道作為低揚程泵站的重要組成部分,如果流道內(nèi)流態(tài)不良,會降低泵裝置效率,甚至會威脅泵站的安全運行。虹吸式出水流道利用虹吸原理,斷流方式簡單可靠,但是工程投資較大,且斷面形狀復雜,設計尺寸不當易引起機組振動等不良現(xiàn)象。在我國已建的大型低揚程泵站中出水流道很多采用虹吸式,因此,本文選擇研究優(yōu)化虹吸式出水流道的水力性能具有重要的理論意義和實用價值。工程中設計出水流道往往需要設計人員花費大量的時間去繪制單線圖。如果能夠設計一個界面,用戶只要提供流道主要控制尺寸就能得到相關單線圖,這樣就大大提高了流道繪制效率。因此,對出水流道的參數(shù)化二維繪圖軟件設計具有一定的工程實用價值。本文的內(nèi)容分為兩部分.:第一部分是虹吸式出水流道優(yōu)化設計研究,第二部分是流道的二維參數(shù)化繪圖軟件設計研究。虹吸式出水流道水力優(yōu)化設計研究采用了流體力學Navier-Stokes方程和標準k-ε湍流模型對虹吸式出水流道進行了數(shù)值模擬研究,其主要內(nèi)容是:分析比較了虹吸式出水流道幾何參數(shù)對流道水力性能的影響,包括:上升段傾角、駝峰斷面高度、下降段傾角和出口斷面寬度。在這些幾何參數(shù)中,流道水頭損失隨著上升段傾角α的增大而呈現(xiàn)先逐漸減小后逐漸增大的趨勢。駝峰斷面高度對流道影響很大,隨著駝峰斷面高度H2的增大,流道水頭損失是先減小后逐漸增加的。但由于流道駝峰斷面高度的選擇還要兼顧土建投資,所以也不宜過大,宜取在H2 =0.88D0左右。下降段傾角除了對流道水力性能有影響,還對工程土建投資有較大影響。下傾角值越大,流道水頭損失就越大。出口斷面寬度B3過大會引起虹吸式出水流道水頭損失的明顯增加,在B3大于2.31D0時,B3與水頭損失關系沒有明顯影響。在二維參數(shù)化繪圖軟件設計部分采用某種虹吸式出水流道線型設計方法,編制了設計主程序(主要由上升段、駝峰段、下降段和出口段四個部分組成)。以AutoCAD繪圖軟件作為繪圖平臺,運用Visual Basic語言與其做接口,編制了繪制虹吸式出水流道剖面圖、俯視圖。為了研究虹吸式出水流道幾何參數(shù)和水力損失之間的函數(shù)關系,利用VB語言和MATLAB語言混合編程和多元回歸模型,得到擬合方程和殘差圖。
[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 偽 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.
【學位授予單位】：揚州大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TV675;TV136.2

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