本文選題：風(fēng)力機(jī)葉片 + 可靠性　； 參考：《浙江工業(yè)大學(xué)》2011年碩士論文

【摘要】：葉片是風(fēng)力機(jī)的核心部件,隨著風(fēng)力機(jī)向大型化發(fā)展,兆瓦級(jí)風(fēng)力機(jī)葉片對(duì)可靠性和質(zhì)量都提出了更高的要求,傳統(tǒng)的葉片設(shè)計(jì)方法往往將氣動(dòng)設(shè)計(jì)和結(jié)構(gòu)設(shè)計(jì)分離開(kāi)來(lái),在設(shè)計(jì)時(shí)注重保證風(fēng)能效率的最大化,使得葉片質(zhì)量較大,從而導(dǎo)致了較高的風(fēng)能成本。另一方面,隨著新型材料以及新型制造工藝的發(fā)展,傳統(tǒng)的安全系數(shù)法的可能過(guò)于保守或者不安全�；诙鄬W(xué)科可靠性優(yōu)化設(shè)計(jì)方法,本文提出綜合考慮氣動(dòng)性能與結(jié)構(gòu)強(qiáng)度,在保證可靠性的同時(shí)降低風(fēng)能成本。本文的主要工作和成果如下： (1)基于氣動(dòng)性能的葉片氣動(dòng)外形優(yōu)化設(shè)計(jì),首先設(shè)計(jì)葉片的基本參數(shù),包括尖速比、翼型等,并計(jì)算獲得翼型的氣動(dòng)數(shù)據(jù),然后利用葉素動(dòng)量理論,對(duì)弦長(zhǎng)和扭角進(jìn)行優(yōu)化設(shè)計(jì),初始葉片額定功率達(dá)2.65MW。 (2)基于結(jié)構(gòu)強(qiáng)度的風(fēng)力機(jī)葉片優(yōu)化設(shè)計(jì),首先選擇葉片結(jié)構(gòu)形式和材料,然后基于安全系數(shù)法,建立優(yōu)化設(shè)計(jì)模型,對(duì)0。玻璃鋼鋪層厚度進(jìn)行優(yōu)化設(shè)計(jì)。設(shè)計(jì)結(jié)果顯示葉片厚度和質(zhì)量分布符合實(shí)際情況且撓度比較小。 (3)基于一次二階矩法,建立了葉片彎曲應(yīng)力可靠性計(jì)算方法,探索了材料性能對(duì)可靠性的影響程度,結(jié)果發(fā)現(xiàn)材料強(qiáng)度的變異系數(shù)對(duì)可靠性影響最大。在此基礎(chǔ)上建立葉片可靠性優(yōu)化設(shè)計(jì)模型,再次對(duì)初始葉片的0。玻璃鋼鋪層厚度進(jìn)行優(yōu)化設(shè)計(jì),設(shè)計(jì)結(jié)果與基于安全系數(shù)法的設(shè)計(jì)結(jié)果吻合。 (4)基于XFOIL翼型氣動(dòng)分析軟件和BEM理論,建立了由翼型相對(duì)厚度計(jì)算獲得額定功率的數(shù)學(xué)模型,為多學(xué)科可靠性優(yōu)化設(shè)計(jì)模型做了準(zhǔn)備。 (5)研究了葉片氣動(dòng)性能和葉片質(zhì)量的耦合關(guān)系,葉片內(nèi)圈的額定功率隨翼型相對(duì)厚度先增加后減小,當(dāng)25%翼展處的翼型相對(duì)厚度為0.246時(shí)額定功率最大,葉片質(zhì)量則隨翼型相對(duì)厚度增大而減小。 (6)分別以風(fēng)能效率最大化、風(fēng)能效率成本最小和葉片質(zhì)量最小為設(shè)計(jì)目標(biāo),建立了基于多學(xué)科可靠性優(yōu)化設(shè)計(jì)模型,對(duì)葉片翼型相對(duì)厚度和0。玻璃鋼鋪層厚度進(jìn)行優(yōu)化設(shè)計(jì),優(yōu)化結(jié)果表明適當(dāng)犧牲葉片風(fēng)能效率,可大幅減輕葉片的質(zhì)量,從而降低風(fēng)能成本。
[Abstract]:On the other hand , with the development of new material and new manufacturing technology , the traditional safety factor method may be too conservative or unsafe . On the other hand , with the development of new material and new manufacturing technology , the traditional safety factor method may be too conservative or unsafe . On the other hand , with the development of new material and new manufacturing process , the traditional safety factor method may be too conservative or unsafe .

( 1 ) aerodynamic performance - based aerodynamic shape optimization design , first design the basic parameters of the blade , including the tip speed ratio , the airfoil , etc . , and calculate the aerodynamic data of the airfoil , then use the blade momentum theory to optimize the chord length and twist angle , and the rated power of the initial blade reaches 2.65MW .

( 2 ) Based on the structural strength of wind turbine blade optimization design , first select the form and material of the blade structure , then establish the optimal design model based on the safety factor method , and optimize the thickness of the layer of 0 . The design results show that the blade thickness and mass distribution meet the actual situation and the deflection is relatively small .

( 3 ) Based on the second - order moment method , the reliability calculation method of blade bending stress is established , and the influence degree of material performance on reliability is explored .

( 4 ) Based on the aerodynamic analysis software and BEM theory of XFOIL airfoil , a mathematical model for obtaining the rated power from the relative thickness of the airfoil is established , which is prepared for the multi - disciplinary reliability optimization design model .

( 5 ) The coupling relation of aerodynamic performance and blade mass is studied . The rated power of the inner ring of the blade decreases with the increase of the relative thickness of the airfoil . When the relative thickness of the airfoil at 25 % span is 0.246 , the rated power is the largest , and the blade mass decreases with the increase of the relative thickness of the airfoil .

( 6 ) Based on the maximum wind energy efficiency , the minimum cost of wind energy efficiency and the minimum blade quality , a multi - disciplinary reliability optimization design model is established , the relative thickness of the blade airfoil and the thickness of the layer of glass fiber are optimized , and the optimization results show that the wind energy efficiency of the blades is properly sacrificed , and the quality of the blades can be greatly reduced , so that the wind energy cost can be reduced .

【學(xué)位授予單位】：浙江工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類號(hào)】：TH43

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