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  本文關鍵詞：岸式振蕩水柱波能轉(zhuǎn)換裝置的時域模擬　出處：《大連理工大學》2014年碩士論文　論文類型：學位論文

  更多相關文章： 振蕩水柱 高階邊界元 源造波 時域模擬

【摘要】：隨著經(jīng)濟的增長、環(huán)境的惡化,世界各國對清潔、可再生能源的需求越來越迫切。波浪能是一種發(fā)展前景廣闊的可再生能源,而振蕩水柱波能轉(zhuǎn)換裝置(OWC)是目前應用最成功最廣泛的波浪能轉(zhuǎn)換裝置之一,它具有結構簡單、可靠性好,易于安裝和維護等優(yōu)點。 本文應用高階邊界元方法(HOBEM)建立了岸式OWC的二維完全非線性時域數(shù)值模型。模型中采用源造波方法產(chǎn)生波浪,在氣室內(nèi)引入壓強模型模擬氣液耦合作用,引入粘性模型模擬粘性耗散。求解中采用混合歐拉-拉格朗日方法追蹤瞬時水面,運用四階龍格庫塔方法更新自由水面上水質(zhì)點的位置和速度勢并在每一個時間步上重新劃分網(wǎng)格。 文中通過與已發(fā)表的關于平底岸式OWC與有底坡的岸式OWC的解析解、實驗值和數(shù)值結果的對比,驗證了模型的準確性,并通過數(shù)值計算研究了岸式OWC在規(guī)則波和不規(guī)則波作用下的水動力性能。 計算結果表明：在規(guī)則波作用下,不同周期入射波對應不同的透平最佳阻尼系數(shù),長周期波浪作用下能量轉(zhuǎn)換效率對透平阻尼系數(shù)不敏感。結構尺寸的變化會影響OWC的共振頻率與能量轉(zhuǎn)換效率,前墻尺寸的變化對低頻區(qū)的能量轉(zhuǎn)換效率的影響很小,而氣室寬度的改變會影響OWC在整個工作頻率區(qū)間的能量轉(zhuǎn)換效率。在低頻區(qū),底坡角度的增加會導致能量轉(zhuǎn)換效率的減小,而高頻區(qū)剛好相反。前墻水平波浪力形態(tài)取決于入射波周期,在共振頻率附近一階分量占絕對主導地位,在高頻區(qū)和低頻區(qū)前墻水平力的高階分量變得比較明顯。不規(guī)則波作用下,氣室中點波面與氣室內(nèi)壓強譜的譜峰頻率都高于入射波譜的譜峰頻率,輸出功率曲線十分不穩(wěn)定。
[Abstract]:With the growth of economy and the deterioration of environment, the demand for clean and renewable energy is more and more urgent. Wave energy is a kind of renewable energy with broad development prospects. The oscillating water column wave energy converter (OWC) is one of the most successful and widely used wave energy conversion devices. It has the advantages of simple structure, good reliability, easy installation and maintenance. In this paper, a two-dimensional completely nonlinear time-domain numerical model of shore OWC is established by using the high-order boundary element method (HSE). The wave generation method is used to generate waves in the model. The pressure model is introduced to simulate the gas-liquid coupling and the viscous model is introduced to simulate the viscous dissipation. The hybrid Euler-Lagrangian method is used to track the instantaneous water surface. The fourth order Runge-Kutta method is used to update the position and velocity potential of water quality points on free water surface and to remesh each time step. The accuracy of the model is verified by comparing the analytical solutions, experimental values and numerical results with the published analytical solutions of flat-bottom OWC and shore-type OWC with bottom slopes. The hydrodynamic performance of shore OWC under the action of regular and irregular waves is studied numerically. The calculated results show that under the action of regular waves, different periodic incident waves correspond to different optimal damping coefficients of turbines. The energy conversion efficiency is not sensitive to the damping coefficient of the turbine under the action of long-period wave. The change of the structure size will affect the resonance frequency and energy conversion efficiency of OWC. The change of the front wall size has little effect on the energy conversion efficiency in the low frequency region, while the change of the air chamber width will affect the energy conversion efficiency of the OWC in the whole operating frequency range. The increase of bottom slope angle leads to the decrease of energy conversion efficiency, while the high frequency region is just the opposite. The horizontal wave force shape of the front wall depends on the incident wave period, and the first order component dominates the resonance frequency. The higher order components of the horizontal force of the front wall in the high frequency region and the low frequency region become obvious. Under the action of the irregular wave, the peak frequency of the point wave surface and the pressure spectrum in the chamber are higher than the peak frequency of the incident wave spectrum. The output power curve is very unstable.
【學位授予單位】：大連理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：P743.2

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本文編號：1409313