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(1) 式中:λ为风轮的叶尖速比, (2) 图1 翼型角度关系图 Fig. 1 Airfoil angle diagram 变桨技术的主要思路是通过调节桨距角使叶片攻角始终在重点旋转区域内处于最佳攻角处,即在一定叶尖速比下切向力系数达到最大时所对应的攻角,切向力系数与攻角的关系如图2所示.图2中,CL和CD分别代表翼型的升力系数和阻力系数,其值可由NACA系列翼型空气动力学特性数据库查得.CT...个方位角下最大扭矩力对应的最佳桨距角,进而得到1周桨距角的调节规律.得到的桨距角变化规律如图5所示. (4) 图3 定桨叶片攻角变化曲线[4] Fig. 3 Change curve of attack angle with fixed pitch angle[4] 图4 NACA0012翼型大攻角升阻力系数曲线[4] Fig. 4 NACA0012 airfoil lift drag......
Effects of Vertical Angle of Conical Punch on Stretch Flangeability of High Strength SteelYukihisa Kuriyama2,Katsuyuki Suzuk22. The University of Tokyo摘 要:To clarify the effects of the vertical angle of a conical punch on stretch flangeability, hole expansion forming tests were conducted. Test results showed that the hole expansion ratio becomes larger......
J. Cent. South Univ. (2018) 25: 2550-2566 DOI: https://doi.org/10.1007/s11771-018-3935-0 Dilation angle variations in plastic zone around tunnels in rocks-constant or variable dilation parameter... of Springer Nature 2018 Abstract: Dilation angle is a significant parameter needed for numerical simulation of tunnels. Even though dilation parameter is physically variable and dependent on confinement......
Effect of blade pitch angle on aerodynamic performance of straight-bladed vertical axis wind turbineZHANG Li-xun(张立勋), LIANG Ying-bin(梁迎彬), LIU Xiao-hong(刘小红), GUO Jian(郭健) (College of Mechanical... method was recognized as an attractive solution to performance improvement, thus majority efforts had been devoted into blade pitch angle effect on aerodynamic performance. Taken into account the local......
analysis on wrist pin bore of aero-piston kerosene engine PAN Zhongjian1, 2, HE Qinghua1, 3, DENG Yu1, 2 (1. School of Mechanical and Engineering, Central South University, Changsha 410083, China; 2...: By establishing mechanics-mathematical model of wrist pin bore installed in aero-piston kerosene engines, the force created by thread connection position between piston crown and piston skirt was analyzed......
PIN结构GaInAsSb红外探测器的PSPICE模型 夏冠群1,伍滨和1,黄文奎1,程宗权1,李志怀1 (1.中国科学院上海微系统与信息技术研究所,上海,200050) 摘要:研究了 PIN结构 GaInAsSb 红外探测器的暗电流特性,建立了器件的 PSPICE模型.模拟结果 与实际测试结果基本符合.计算结果表明,器件表面和内部的缺馅及表面复合电流对器件的反向 特性起主要作用 ,当反向偏压大于 0.35V,缺陷引起的隧穿电流对器件暗电流起主要作用. 关键词:GaInAsSb; 红外探测器; PSPICE; [全文内容正在添加中] ......
Trans. Nonferrous Met. Soc. China 20(2010) s888-s892 Numerical simulation and experiment validation of thixoforming angle frame of AZ61 magnesium alloy JIANG Ju-fu (姜巨福) 1,2, WANG Ying... 2010; accepted 25 June 2010 Abstract: Numerical simulation and experiment of thixoforming angle frame of AZ61 magnesium alloy were investigated. The results show that with the increase in punch......
Trans. Nonferrous Met. Soc. China 25(2015) 2856-2865 Effect of small tool pin profiles on microstructures and mechanical properties of 6061 aluminum alloy by friction stir welding H. I. DAWOOD1,2..., Universiti Teknologi Malaysia, Skudai 81310, Malaysia Received 20 October 2014; accepted 29 June 2015 Abstract: The effect of small tool pin profiles on the microstructures and mechanical properties of 6061......
Relationship between boundary misorientation angle and true strain during high temperature deformation of 7050 aluminum alloy HU Hui-e(胡会娥)1, YANG Li(杨 丽)1, ZHEN Liang(甄 良)1, SHAO Wen-zhu(邵文柱)1... solution treated 7050 aluminum alloy were conducted to different strain degrees (0.1, 0.4, 0.6 and failure) at 460 ℃ with the strain rate of 1.0×10-4-1.0×10-1s-1. The boundary misorientation angle......
J. Cent. South Univ. Technol. (2011) 18: 1115-1120 DOI: 10.1007/s11771-011-0811-6 Effects of mask wall angle on matrix-hole shape changes during electrochemical machining by mask LI Dong-lin(李冬林... University Press and Springer-Verlag Berlin Heidelberg 2011 Abstract: The influences of the mask wall angle on the current density distribution, shape of the evolving cavity and machining accuracy were......