【摘要】：灌溉渠道在輸水配水過程中由于用水變化導(dǎo)致控制建筑物的控制機(jī)構(gòu)動態(tài)變化,以實現(xiàn)流量調(diào)節(jié)。通過調(diào)節(jié),經(jīng)非恒定流的過渡過程完成渠道從一種恒定流狀態(tài)轉(zhuǎn)向另一種恒定流狀態(tài)。通過對明渠非恒定流理論進(jìn)行系統(tǒng)論述,明確了控制灌溉渠道水流運(yùn)動的方程組,為建立流動的數(shù)值模型打下了基礎(chǔ)。應(yīng)用Saint Venant方程組和Preissmann隱式差分格式建立明渠恒定流和非恒定流數(shù)值模型;所得到的恒定流代數(shù)方程采用簡單迭代法求解,比其它計算水面線的方法簡潔;得到的非恒定流非線性代數(shù)方程組采用Newton-Rapnson迭代法求解,線性代數(shù)方程組采用直接三角分解方法求解,模型考慮了分流口,閘、堰復(fù)合型內(nèi)邊界條件,模型具有較好的收斂性和穩(wěn)定性;模型對更為復(fù)雜的邊界條件有較好的可擴(kuò)展性。將模型用于河南省開封柳園口灌區(qū)總干渠,可以對來流變化、閘門開度變化和分水口引水變化,以及恒定條件下的總干渠的流動進(jìn)行模擬,得到的結(jié)果對實際應(yīng)用具有一定的參考價值,同時為全面構(gòu)建灌區(qū)全渠系流動及控制模型,奠定了基礎(chǔ)。
[Abstract]:In order to realize the flow regulation, the dynamic change of the control mechanism of the building is caused by the change of the water used in the irrigation canal during the process of water transfer and distribution. By adjusting, the transition process of unsteady flow completes the channel from one constant flow state to another constant flow state. By systematically discussing the theory of unsteady flow in open channel, the equations for controlling the flow movement of irrigation channel are defined, which lays the foundation for the establishment of numerical model of flow. The numerical models of open channel constant flow and unsteady flow are established by using Saint Venant equations and Preissmann implicit difference scheme, and the obtained constant flow algebraic equations are solved by simple iterative method, which is simpler than other methods for calculating water surface lines. The nonlinear algebraic equations of unsteady flow are solved by Newton-Rapnson iterative method, and the linear algebraic equations are solved by direct triangular decomposition method. The model has better convergence and stability, and better expansibility for more complex boundary conditions. The model is applied to the general trunk canal of Liuyuankou Irrigation District in Kaifeng, Henan Province, which can simulate the change of inflow, the change of gate opening, the change of diversion of water diversion and the flow of total trunk canal under constant conditions. The obtained results have some reference value for practical application and lay a foundation for the overall construction of the flow and control model of the whole canal system in the irrigation area.
【學(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TV133.2

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 耿兆銓;;二維非恒定流動的有限元計算模式[J];華東水利學(xué)院學(xué)報;1981年04期

2 王兆印;中德加強(qiáng)合作研究非恒定流輸沙[J];泥沙研究;1996年01期

3 白玉川,萬艷春,黃本勝,顧元h，

本文編號：2226339