【作者】 戚中浩；

【导师】 张晓东；

【作者基本信息】 华北电力大学（北京） ， 热能动力工程， 2010， 硕士

【摘要】 我国幅员辽阔,广大的三北地区和东南沿海地区蕴藏着大量优质的风能资源。然而,当地风电场的建设直接面临着高、低温的考验,威胁着风力机的安全稳定运行。因此,机舱内温度场性质和冷热源位置如何布置显得尤为重要。为了确定分析这一问题合理可信的数值计算方法,论文选择了与机舱内温度场问题相似的、具有实验测量结果的二维方腔和三维空调房间问题进行数值计算结果确认。根据确定的数值计算方法,对简化后的机舱进行了包括环境温度和热源体位置变化对机舱内自然对流换热的影响研究。结果显示：环境温度降低,机舱内平均温度呈线性降低；热原体在机舱内存在自然对流换热最佳位置。在以上研究的基础上,对2.5MW真实机舱进行了温度场数值计算分析。由于其外形及内部件结构复杂,论文进行了简化并保留机舱外形、热源体及体积较大的内部件。通过分析给定热源条件下的机舱内温度场,为加热器位置的布置、机舱内零部件保温提供参考。更多还原

【Abstract】 China has a vast area, there are plenty of high-quality wind energy resources in three northern regions and south-east coastal region. However, construction of wind farms and operation of wind turbines are influenced by local climate, especially very high or very low environment temperature, which threatens the safety and stable operation of wind turbines. Therefore, study of the temperature field, nature convection process inner a nacelle and how temperature and flow field will be influenced by location of cold and heat sources is very important.In order to carry out a reasonable analysis of this issue with credible numerical methods, cases similar to the temperature field inside the nacelle is selected, with experimental results to verify numerical methods. The simplified cases include two-dimensional cavity and three-dimensional air-conditioned room. Numerical model of the simplified cabin is built, including ambient temperature and the heat inside the cabin, and change of human body position. Simulation results show that the average temperature inside the nacelle will change linearly with environmental temperature. How uniform the temperature field is will be influenced by position of heating source. Numerical investigation is carried out for inner space of nacelle of a 2.5MW wind turbine. The shape and internal structure of the nacelle are very complex, Geographical simplification is necessary at first step. Temperature and flow field inner the nacelle are calculated and analyzed, the results and conclusion could be used as reference for design of wind turbine nacelle.更多还原