【摘要】：隨著我國高水頭、大流量水電站的建成,以及新式消能工的推廣應(yīng)用,泄洪霧化問題日益凸顯。目前對泄洪霧化的范圍和強度進行預(yù)測的方法有:原型觀測、理論計算、數(shù)值計算等。由于中小尺度數(shù)值氣象模式WRF(Weather Research and Forecasting),可模擬分辨率達1km的局地氣象場,SPH(Smoothed Particle Hydrodynamics)方法可以模擬泄洪霧化中水滴的運動和碰并作用,使得結(jié)合WRF模式和SPH方法對泄洪霧化進行預(yù)測成為一種可行的方法。本文以挑流泄洪霧化為研究對象,研究了局地氣象場和水滴碰并對泄洪霧化現(xiàn)象的影響,使用SPH水滴碰并模型來預(yù)測泄洪霧化的范圍和降雨強度。論文的主要內(nèi)容及成果如下:1.WRF模式在河谷地形下邊界層方案的敏感性分析。應(yīng)用WRF模式,對河谷地形下WRF的多種邊界層方案進行對比分析。并使用模擬精度相對較高的邊界層方案,即MYNN2邊界層方案,對二灘水電站風(fēng)速場進行了數(shù)值模擬。2.使用SPH方法構(gòu)建水滴碰并模型。首先對摻氣水舌和霧化源的特性進行研究,其次基于隨機噴濺模型,建立了SPH水滴碰并的數(shù)學(xué)模型,模型中考慮了水滴受到重力、水舌風(fēng)、自然風(fēng)等作用力和水滴相互之間的碰并作用。3.使用SPH水滴碰并模型對二灘水電站的挑流泄洪霧化進行預(yù)測,并利用二灘水電站的原型觀測數(shù)據(jù)進行驗證計算,驗證了使用SPH方法構(gòu)建的水滴碰并數(shù)學(xué)模型在實際工程中的準(zhǔn)確性。
[Abstract]:With the construction of high water head, large flow hydropower stations and the popularization and application of new energy dissipators, the problem of flood discharge atomization has become increasingly prominent. At present, the methods of predicting the scope and intensity of flood discharge atomization include prototype observation, theoretical calculation, numerical calculation and so on. Because the mesoscale numerical meteorological model (WRF (Weather Research and Forecasting),) can simulate the local meteorological field (, SPH (Smoothed Particle Hydrodynamics) method with a resolution up to 1km, it can simulate the motion and collision of water droplets in flood discharge atomization. It is a feasible method to predict flood discharge atomization with WRF model and SPH method. In this paper, the influence of local meteorological field and water droplet impact on the atomization of flood discharge is studied. The SPH model is used to predict the range of atomization and the intensity of rainfall. The main contents and results are as follows: sensitivity analysis of 1.WRF model in boundary layer scheme under valley topography. By using WRF model, several boundary layer schemes of WRF under valley topography are compared and analyzed. The wind velocity field of Ertan Hydropower Station is numerically simulated by using the MYNN2 boundary layer scheme, which has relatively high simulation accuracy. 2. The water drop collision model was constructed by using SPH method. Firstly, the characteristics of aerated water tongue and atomization source are studied. Secondly, based on the random splash model, the mathematical model of SPH water droplet collision is established, in which the gravity of the water droplet and the water tongue wind are considered in the model. Natural wind and other forces and the impact of water droplets on each other. 3. The SPH droplet collision model is used to predict the spillway of Ertan Hydropower Station, and the prototype observation data of Ertan Hydropower Station are used to verify the calculation. The accuracy of the water drop collision mathematical model constructed by SPH method is verified in practical engineering.
【學(xué)位授予單位】：華北電力大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TV135.2

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