1+1/2对转涡轮设计及控制方法探索

本文对 1 1/2对转涡轮试验件进行了详细设计,并对其控制问题进行了初步探讨,结果表明所设计 1 1/2对转涡轮基本达到设计要求,其控制问题由高压静叶可调和尾喷管面积调节共同解决。     

Effect of frequency of air flow on the performance of the Wells turbine

Experimental investigations on the effect of Strouhal number and rotor solidity on the performance of 0.2m diameter Wells self rectifying air turbine with NACA 0021 profile blades are presented. The results show an increase in starting torque with the Strouhal number of airflow and rotor solidity. The effect of Strouhal number on the running performance of the turbine is solidity dependent     

透平叶片中的二次流旋涡结构的研究

当今在透平机械行业中的研究人员常常会被二次流旋涡结构的研究所吸引。本文作者主要用数值计算,部分地也用实验手段,试图研究、分析与讨论叶片通道中马蹄涡、通道涡、角隅涡和间隙涡等二次流旋涡的生成、演绎与发展。对于壁涡由于尺寸很小而不容易发现。现在应用弯扭叶片作为一种手段来降低叶片损失的人多了,从而需要对弯扭叶片对上述旋涡的影响进行研究。因此,本文对周向弯扭叶片的影响以及其对损失影响的机理也进行了讨论。     

从分子运动论看连续介质气体动力学和稀薄气体的新特性

首先，综述了根据分子运动论对连续介质极限气体行为的最近研究．它表明：经典的连续气体动力学是不完整的；用分子运动论分析在连续介质极限时一些重要情况得到气体的正确行为是必不可免的．即，除了特殊的情况，甚至在平均自由程变为零的极限下热传导方程不能描述静止气体温度场；文中给出了根据分子运动论导出的温度场的正确方程组和边界条件及其具体应用．还用同轴圆筒间的包含气体凝聚相的气体流场的渐近分析，论证了经典连续气体动力学方程组的不完整性．其次，综述了最近几年发现的稀薄气体流动的新特性．如在凸体周围速度分布函数的不连续性及它与Ｓ层的关系，加热平板边缘周围引起的流动，有周期性温度分布的管道内产生的单方向流动．     

A numerical solution of 3D inviscid rotational flow in turbines and ducts

The numerical solutions of inviscid rotational (Euler) flows were obtained using an explicit hexahedral unstructured cell vertex finite volume method. A second-order-accurate, one-step Lax–Wendroff scheme was used to solve the unsteady governing equations discretized in conservative form. The transonic circular bump, in which the location and the strength of the captured shock are well predicted, was used as the first test case. The nozzle guide vanes of the VKI low-speed turbine facility were used to validate the Euler code in highly 3D environment. Despite the high turning and the secondary flows which develop, close agreements have been obtained with experimental and numerical results associated with these test cases. © 1998 John Wiley & Sons, Ltd.     

汽封结构内部流动现象的数值研究

本文采用作者发展的叶轮机械通用计算程序ＧＡＰ１０对带围带汽封和隔板汽封结构的动 叶片排流场进行了三维数值模拟,并着重对汽封结构内部流动结构进行了分析。     

缘线匹配技术在轴流压气机设计中的应用探索

叶轮机缘线匹配技术以叶轮机相邻叶排前、后缘线空间相对位置为非定常设计自由度来进一步提升叶轮机性能,这在叶轮机定常设计框架下是不能考虑的。本文以单级轴流压气机设计为例对缘线匹配非定常设计技术进行数值研究,初步展示了缘线匹配的应用方法及其设计验证,数值计算结果表明缘线匹配技术为叶轮机非定常气动设计提供了有效的设计途经。     

A new Navier–Stokes inverse method based on mass‐averaged tangential velocity for blade design

This paper presents a novel viscous inverse method for blade design. In this inverse design method the mass‐averaged tangential velocity and the blade thickness are prescribed, and the corresponding blade profile is sought. The blade profile is then computed iteratively using the discrepancies between the prescribed mass‐averaged tangential velocity distribution and its calculated distribution on an initial blade. The re‐design of an axial rotor blade, starting from an initial arbitrary profile in subsonic flow regimes, demonstrates the merits and robustness of this approach. Copyright © 2008 John Wiley & Sons, Ltd.     

用于叶轮机内流测量的压力敏感涂料校准实验

本文介绍了用于叶轮机械内部流动测量的PSP技术校准系统的组成及校准实验结果。通过对所采集实验图像数据的计算处理,得到了校准特性曲线,与文献的结论基本吻合.同时还对特性曲线的影响因素进行了分析.