【作者】 韩巧丽；

【导师】 田德；

【作者基本信息】 内蒙古农业大学 ， 农业机械化工程， 2006， 博士

【摘要】 本论文的选题是国家自然科学基金资助项目《浓缩风能型风力发电机叶轮系列化的风洞实验与研究》[批准号:59776033](快速反应项目)中的一部分。研究目的是通过采用车载法对大容量浓缩风能型风力发电机相似模型的气动特性、发电功率输出特性进行实验研究,对研究结果与风洞实验结果进行对比分析,初步建立浓缩风能型风力发电机中、大容量的系列化机组的关键参数的理论设计公式。在浓缩风能型风力发电机的前期研究基础上,设计制造了大容量机组的相似模型Ⅰ。采用车载法选择10m/s、12m/s、14m/s三种风速对相似模型Ⅰ的中央流路内的6列、8排共48个特征点的总压、静压等气动参数进行了测试,对测定结果和气动特性进行了理论分析研究。研究结果得出:模型内叶轮安装处的气流流速是前方相同面积来流风速的1.31倍,气流动能增至前方相同面积来流风能的2.25倍。在相似模型Ⅰ的气动特性实验中,发现了在距相似模型Ⅰ入口565mm处(扩散管轴向长度的37.8%处),气流流速是前方相同面积来流风速的1.34倍,气流动能增至前方相同面积来流风能的2.41倍。在相似模型Ⅰ的基础上,收缩管的直线圆锥改造成母线为圆弧形的圆锥,称相似模型Ⅱ。采用车载法,选择与相似模型Ⅰ相同的实验内容和实验条件,对特征点的总压、静压等气动参数进行了测试,对测定结果和气动特性进行了理论分析研究。研究结果得出:模型Ⅱ内叶轮安装处的气流流速是前方相同面积来流风速的1.38倍,比相似模型Ⅰ提高了5.3%,气流动能增至前方相同面积来流风能的2.63倍,比相似模型Ⅰ提高了16.9%。在相似模型Ⅱ的气动特性中,发现了在距相似模型Ⅱ入口断面365mm处(扩散管入口断面处),气流流速是前方相同面积来流风速的1.40倍,比相似模型Ⅰ提高了4.5%,气流动能增至前方相同面积来流风能的2.74倍,比相似模型Ⅰ提高了13.7%。在相似模型Ⅱ的气动特性中,选取风速为12m/s时对在不同温度条件下的气动特性进行了实验研究。研究结果得出:温度对气动特性的影响与理论分析结果一致,为建立中、大容量系列化浓缩风能型风力发电机的理论设计公式提供了实验依据。在相似模型Ⅱ内设计安装了风能利用系数CP为0.182、叶轮直径为860mm的六叶片叶轮,选用了效率为0.655的100W永磁直驱式风力发电机进行了功率输出特性实验,实验结果证明:叶轮安装处的气流流速是前方相同面积来流风速的1.37倍,气流动能增至前方相同面积来流风能的2.57倍。此实验结果与气动特性实验结果一致性很高。根据相似模型Ⅰ的气动特性、相似模型Ⅱ的气动特性和功率输出特性和相似原理、气体动力学、贝茨理论、叶轮设计等理论初步建立了中、大容量系列化浓缩风更多还原

【Abstract】 The research was part of the project–wind tunnel test and study on serial impellers of CWET founded by National Natural Science Foundation of China (the number warranted:59306060) .The aim was to find pneumatic and power performance of resemble model of Large Capacity CWET carried by in-truck test. The result was compared with the data obtained in the wind tunnel and established the design formula in principl of serial capacity of CWET.The resemble modelⅠwas designed and made based on the CWET.Total pressure, static pressure and some other pneumatic characteristics in contracting pipe, center cylinder and diffuser of the resemble modelⅠwere tested. The result of test was analyzed, and showed that the flow speed (where impeller installed in modelⅠ) was 1.31 times faster than the speed of natural wind, and the flux energy increased to 2.25 times.Through the pneumatic experiment of resemble modelⅠ, it was discovered the fact that the flow speed was 1.34 times faster than the natural wind speed at 565mm to the entrance section (37.8% of the length of diffuser in axial spacing),and flux energy increased to 2.41 times of the same area.On the base of resemble modelⅠ, the figure of contracting pipe was changed, the generatrix became arc for once it was straight line, named resemble modelⅡ. Total pressure, static pressure and some other pneumatic characteristics in contracting pipe, center cylinder and diffuser of the resemble modelⅡwere tested. It was tested outside in-truck under the same experimental condition as it was in the test of resemble modelⅠ. The result obtained showed that it was 1.38 times faster than the speed of natural wind where impeller installed, compared with modelⅠthe value increased 5.3%. Flux energy became 2.63 times of the natural wind in same area, 16.9% higher than modelⅠ.In the pneumatic experiment of resemble modelⅡ, it was found that the flow speed at 365mm to the entrance section 0f resemble modelⅡ(entrance section of diffuser) was 1.40 times faster than the natural wind speed, 4.5% higher than resemble modelⅠ. Flux energy increased to 2.74, 13.7% higher than modelⅠ. The fact was worth to lucubrate.In pneumatic experiment of resemble modelⅡ, pneumatic characteristic was studied at the speed of 12m/s under various temperature. The result of test proves that the effect of temperature on pneumatic characteristic in accordance with the result of theories analyze. The experiment result provided guidance for the establishment of theories更多还原