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  本文選題：復(fù)合式筒形基礎(chǔ)　切入點：海上風(fēng)電　出處：《天津大學(xué)》2014年碩士論文

【摘要】：風(fēng)能資源具有高效和環(huán)保的優(yōu)點，現(xiàn)已成為許多國家開發(fā)和利用的重要能源。海上風(fēng)力資源是陸地風(fēng)力資源的5倍，所以風(fēng)電正在向海上發(fā)展。海上風(fēng)機的基礎(chǔ)矗立于復(fù)雜的海洋環(huán)境中，準確計算基礎(chǔ)上所受波浪荷載尤為關(guān)鍵。本文基于線性繞射理論改進了MacCamy-Fuchs公式，使之適用于復(fù)合式筒型基礎(chǔ)計算，并設(shè)立了四組規(guī)則波工況，分別通過Flow-3D數(shù)值波浪水槽模擬和物理水槽模型試驗對改進公式的計算結(jié)果進行了驗證。本文的主要內(nèi)容和結(jié)論如下： （1）基于線性繞射理論改進并推導(dǎo)了適用于大尺度結(jié)構(gòu)物上的波浪荷載計算公式。新公式將原公式中的定值半徑r改為沿水深改變的函數(shù)R z，并簡化了邊界條件。在規(guī)則線性波浪作用下，改進公式計算結(jié)果與規(guī)則結(jié)構(gòu)物上波浪荷載計算結(jié)果規(guī)律相符合，，計算荷載大小比前人使用莫里森公式計算出的結(jié)果略大。 （2）利用計算流體動力學(xué)軟件Flow3D建立了波浪和建筑物相互作用的三維數(shù)值水槽模型，模型采用規(guī)則造波邊界造波，孔隙質(zhì)結(jié)合出流邊界進行消波。文本在數(shù)值水槽模擬中驗證了天津大學(xué)李世森提出的在垂向孔隙率取為0.8，橫向和縱向孔隙率取為0.9時，能有效減小出流邊界的波浪反射的結(jié)論，并計算出了波浪荷載。數(shù)值計算結(jié)果與改進公式計算結(jié)果比較相差在3%-9%。 （3）在物理水槽中，設(shè)立了波浪模型試驗。在按照幾何比尺制作的風(fēng)機基礎(chǔ)模型上安裝了25只點脈壓傳感器對基礎(chǔ)上的波浪荷載進行測量。文本利用平面上的點面轉(zhuǎn)化系數(shù)公式，得到了復(fù)合式筒型基礎(chǔ)在不同波浪荷載下的點面轉(zhuǎn)化系數(shù)，取值范圍為0.75-0.85。物理模型測試結(jié)果與改進公式計算結(jié)果比較相差在1%-10%，與數(shù)值計算結(jié)果比較相差在1%-9%。此結(jié)論充分驗證了改進公式的準確性，并可以為海上風(fēng)機基礎(chǔ)設(shè)計提供一定的參考。
[Abstract]:Wind energy, which has the advantages of high efficiency and environmental protection, has become an important source of energy for development and utilization in many countries. So wind power is developing to the sea. The foundation of offshore fan stands in complex marine environment. It is very important to calculate wave load on the basis of accurate calculation. In this paper, the MacCamy-Fuchs formula is improved based on linear diffraction theory. It is suitable for the calculation of composite cylindrical foundation, and four sets of regular wave conditions are established. The calculation results of the improved formula are verified by Flow-3D numerical wave flume simulation and physical flume model test respectively. The main contents and conclusions of this paper are as follows:. 1) based on the theory of linear diffraction, the formula for calculating wave loads on large scale structures is derived. The new formula changes the constant radius r of the original formula to the function R z, which changes along the depth of water, and simplifies the boundary conditions. Under regular linear waves, The calculated results of the improved formula are consistent with the results of wave loads on regular structures, and the calculated loads are slightly larger than those calculated by previous researchers using Morrison's formula. (2) using the computational fluid dynamics software Flow3D, a three-dimensional numerical water tank model of wave and building interaction is established. The model uses regular wave boundary to generate waves. In the numerical flume simulation of Tianjin University, Li Shisen's conclusion that the vertical porosity is 0.8 and the transverse and longitudinal porosity is 0.9 can effectively reduce the wave reflection at the outlet boundary. The wave loads are calculated. The difference between the numerical results and the results of the improved formula is between 3 and 9. A wave model test was established in the physical flume. 25 point pulse pressure sensors were installed to measure the wave load on the fan foundation model made according to the geometric scale. The point and surface conversion coefficients of composite cylindrical foundation under different wave loads are obtained. The range of values is 0.75-0.85.The difference between the results of the physical model test and the calculation of the improved formula is 1- 10, and the difference between the results of the physical model and the numerical calculation is 1- 9.This conclusion fully verifies the accuracy of the improved formula. And it can provide some reference for the foundation design of offshore fan.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：P731.2;P742

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