本文選題：風(fēng)力發(fā)電機(jī)　切入點(diǎn)：氣動性能　出處：《湘潭大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：風(fēng)力發(fā)電機(jī)工作的過程中,葉片作為轉(zhuǎn)換能量的重要部件時刻都和流場發(fā)生著交互作用,因此,風(fēng)力機(jī)葉片氣動性能的好壞直接決定著其風(fēng)能利用效率的高低。對于葉片而言,流場特性的變化,又對葉片產(chǎn)生了時刻變化的氣動載荷。新產(chǎn)生的氣動載荷再次使葉片發(fā)生形變,如此反復(fù)。這種葉片結(jié)構(gòu)和流場之間的相互作用對風(fēng)力機(jī)的安全平穩(wěn)運(yùn)行構(gòu)成重大威脅;對于流場而言,由于交互作用而產(chǎn)生的葉片變形,會使流場的流動特性發(fā)生改變,而這對大型風(fēng)電場中風(fēng)電機(jī)組間的高效運(yùn)轉(zhuǎn)來說尤為重要。由此可見,對葉片的氣動性能、結(jié)構(gòu)振動特性及流場特性的研究顯得至關(guān)重要。本文基于ANSYS Workbench多物理場仿真平臺,采用CFX雙向流固耦合的方法,以10kW三葉片風(fēng)力機(jī)為研究對象,對其翼型氣動性能、振動特性以及流場特性進(jìn)行研究。主要研究內(nèi)容如下:1.借助CFX軟件對小型風(fēng)力機(jī)專用SG6040翼型的氣動性能進(jìn)行模擬計(jì)算,分析不同湍流模型對翼型近壁面流體流動的影響,以及雷諾數(shù)對翼型升力系數(shù)、阻力系數(shù)、流動分離特性和失速特性等的影響。2.基于Workbench平臺對柔性葉片的結(jié)構(gòu)分析及單、雙向流固耦合進(jìn)行分析,研究預(yù)應(yīng)力對葉片結(jié)構(gòu)模態(tài)和相應(yīng)振型的影響,并分別探討風(fēng)壓預(yù)應(yīng)力及旋轉(zhuǎn)預(yù)應(yīng)力分別對其振動頻率的影響。3.采用雙向流固耦合分析的方法,對風(fēng)輪所在流場進(jìn)行流動特性分析,并對風(fēng)力機(jī)尾跡流場特性進(jìn)行研究,以期對大型風(fēng)電場中風(fēng)力機(jī)組的優(yōu)化布置起到一定的指導(dǎo)意義。
[Abstract]:In the working process of wind turbine, blade, as an important component of energy conversion, interacts with the flow field at all times. Therefore, the aerodynamic performance of wind turbine blade directly determines the wind energy utilization efficiency. With the change of flow field characteristics, the aerodynamic load of the blade changes at all times, and the new aerodynamic load causes the blade to deform again. The interaction between the blade structure and the flow field poses a major threat to the safe and smooth operation of the wind turbine; for the flow field, the blade deformation resulting from the interaction changes the flow characteristics of the flow field. This is especially important for the efficient operation of wind turbines in large scale wind farms. Thus, it is very important to study the aerodynamic performance, structural vibration characteristics and flow field characteristics of blades. This paper is based on ANSYS Workbench multi-physical field simulation platform. The aerodynamic performance of a 10 kW three-blade wind turbine is studied by using CFX two-way fluid-solid coupling method. Vibration characteristics and flow field characteristics are studied. The main contents are as follows: 1. The aerodynamic performance of special SG6040 airfoil for small wind turbine is simulated by using CFX software, and the influence of different turbulence models on the flow near the wall of airfoil is analyzed. The influence of Reynolds number on lift coefficient, drag coefficient, flow separation characteristic and stall characteristic of airfoil. 2. Based on Workbench platform, the structure analysis of flexible blade and the analysis of single and bidirectional fluid-solid coupling are carried out. The influence of prestress on the modal and vibration modes of blade structure is studied, and the influence of wind pressure prestress and rotation prestress on the vibration frequency is discussed respectively. 3. The bidirectional fluid-solid coupling analysis method is used. The flow characteristics of wind turbine are analyzed and the characteristics of wind turbine wake flow field are studied in order to guide the optimal arrangement of wind turbine in large scale wind farm.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TM315

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本文編號：1617911