The outlet flowfield and static pressure on blade surfaces of the classical turbine stator cascades with straight and - 10 、 - 20 bowed blades were measured in the linear cascade wind tunnel 摘要在平面透平叶栅风洞中，测量了一种典型透平静叶型直叶片叶栅和叶片弯曲角分别为- 10 、 - 20的反弯曲叶片叶栅的出口流场和叶片表面静压。
The pump wheels , turbine wheels , and stators generated by the different blade parameter profiles were compared and the fundamental law of the converter performance versus the blade angle profile was derived 通过对不同参数变化规律生成的泵轮、涡轮、导轮的叶型进行对比分析，总结出液力变矩器叶片角变化对液力变矩器性能影响的基本规律。
This thesis is about the design and engineering analysis of a new type of bileaflet artificial heart valve . it can be divided into three main parts : theoretical calculation of the valve , computer aided design , engineering analysis 本论文的内容是关于一种新型的双叶型人工心脏瓣膜的设计与工程分析，可以划分为三个主要部分：人工心瓣的结构理论计算、计算机辅助设计以及计算机辅助工程分析。
The turbine cascade test sections and turbine blades were set up according to the geometry provided by gas turbine establishment of china . experimental measurements were carried out in a large - scale low speed wind tunnel in northwestern poly - technical university 本文根据中国燃气涡轮研究院提供的叶型数据设计并加工了叶栅通道实验段以及试验叶片，实验研究在西北工业大学的大尺寸低速叶栅传热风洞中进行。
In this paper , the current commonly - used types of the interchanges , such as the diamond , three - leg , directional , half - directional , cloverleaf , partial cloverleaf interchanges , are briefly introduced and the features and applicable ranges of the different types of the interchanges as mentioned are discussed as well 简要介绍当前常见的菱型、喇叭型、定向型和半定向型、苜蓿叶型、部分苜蓿叶型等立交互通型式，讨论上述各种立交互通型式的特点及适用范围。
The results indicated that liangyoupeijiu showed better plant and leaf type , higher ratio of grains to leaf area and larger photosynthesis area , stronger ability of population dry matter accumulation during the period of vegetative growth especially from heading to being mature , longer leaf duration and grains - filling after heading than that of its parents and controls s ; more grains per panicle , lager all sink per plant and 1000 - grain weight 结果表明：两优培九株叶型好，粒叶比和光合面积大，营养生长期群体干物质积累能力强，始穗后叶片功能期长、籽粒灌浆持续时间较长，抽穗期至成熟期的干物质增量明显强于其亲本和对照组合；穗颈节间维管组织比亲本及对照发达；两优培九单株总库容量大，每穗实粒数多，千粒重较大。
The main object of this paper is to design a diagonal impeller , which requires small size and high rotating speed the first step of design is to solve the radial distribution of parameters at the inlet and outlet of the blade , such as pressure , temperature and velocity . and then , according to the radial distribution , we can design the diagonal impeller blade . blade elements are defined on a cone , which pass through the blade edge streamline location 其设计思想是采用准三维设计方法，先进行二维流场计算，在叶片轴向间隙中设立计算站，应用数值计算方法计算叶片前后缘的压力、温度、速度等参数沿叶高的分布，然后根据这些参数，选取若干个回转面进行叶型设计；再将各回转面上得到的基元叶型沿某一个积叠轴积叠起来形成三维叶片，最后对得到的三维叶片进行试验，并对实验结果进行分析比较。
The flows in the case of different reduced frequencies are computed respectively for two blade profiles . by comparing the time curves of relative parameters in oscillating cascades and the flow field contours under different conditions , it is indicated that the reduced frequency is an important factor to determine whether the blade flutter happens or not 针对两种叶型分别计算了不同折合频率下的流场，通过比较振动叶栅相关参数随时间变化的曲线及流场云图，表明折合频率是决定叶片颤振与否的重要因素。
Until now , there have been a few reports on the damage of the water pumps caused by sand and water cavitation . by use of the test loop for solid and liquid two phases , under the condition of 3 % head drop , the damage location and relative degree of the sand and water cavitaiton occurred on the impeller were tested and researched . the result was , them , compared with the results under the condition that water cavitation occurred and no cavitation but only wear occurred . the differencts were analyzed . the analysis result can be used as the basis of the further research and the improvement of the impeller shape 目前含沙水汽蚀对水泵损伤方面的报导甚少，本文利用固液两相流试验台，对离心泵闭式叶轮在含沙水汽蚀时（ 3扬程下降点）的损伤部位和相对程度进行了试验研究，并将此结果与清水介质发生汽蚀时的损伤情况[ 13 ]及含沙水无汽蚀情况下的磨损情况[ 7 ]相比较，对其差异进行了分析，为今后进一步探讨叶轮损伤机理和叶型改进提供了实验依据。
As we know , inverse techniques make blade ' s profile well compatible with its surface velocity distribution , however , they give designers big challenges that the ideal velocity distribution is hard to obtained and sometimes the non - physical solution , such as double covering of flow field or unclosed profiles , would come out . the proposed design procedure in the paper has avoided the disadvantage mentioned above . in this paper , a quasi - irrotational equation is used to describe the flow in cascade instead of the generally used irrotational equation 众所周知，一般的反问题和混合问题的最大特点，是在给定的压力面和吸力面上的压力分布或速度分布条件下，直接得到叶片的几何形状，它可以使叶型型面与表面气流参数有机结起来；其不足之处在于，对设计者而言，很难给定理想的叶片表面压力分布或速度分布，并且有时会得到一个非物理解，如：得出的初始叶型可能会出现前缘、尾缘不封闭的现象。
