Design of radial impellers: a combined extended analytical and numerical method
Design of radial impellers: a combined extended analytical and numerical method
复制标题
DOI：
10.1243/09544062jmes1196
复制
发表时间：
2009-04-01
影响因子：
2
通讯作者：
Delgado, A.
中科院分区：
文献类型：
--
作者：
Epple, P.;Karic, B.;Delgado, A.
高速径向叶轮的使用在工业应用的鼓风机中非常常见。使用圆弧叶片制造这些叶轮也是非常常见的。设计过程也几乎总是基于以前的叶轮系列和可用的实验数据。本文提出了一种用解析和数值相结合的方法来提高径向叶轮效率的方法。该方法基于径向叶轮中流动的扩展分析公式，允许在设计阶段优化效率。它是由一个著名的效率优化的定性原则，根据卡诺的数学实现的补充。最后，电机的转矩-速度特性包括在设计阶段。叶片形状的计算使用逆方法。然后，通过计算流体动力学（CFD）计算与商业求解器的设计进行验证。最后，建立了一个原型，并在测试台上进行了测量。它还表明，设计方法提供了非常好的预测，导致效率增加13%，最大流量增加11%。设计点也得到了满足。数值计算与实测结果吻合较好。本文还对计算流体动力学结果进行了分析，对新旧叶轮内的大量流动信息进行了深入了解。提出的方法是一种分析和数值相结合的方法，适合于设计高效率的径向叶轮，同时考虑电机的转矩-速度特性，而不需要以前的叶轮系列或实验数据的知识。
The use of high-speed radial impellers is very common in blowers for industrial application. It is also very common to manufacture these impellers using circular arc blades. The design process as well is almost always based on former impeller series and experimental data available. In this work, a method is presented to improve the efficiency of radial impellers with a combined analytical and numerical method. This method is based on an extended analytical formulation of the flow in radial impellers, allowing optimizing efficiency in the design stage. It is complemented by the mathematical implementation of a well-known qualitative principle of efficiency optimization according to Carnot. Finally, the torque-speed characteristic of the motor is included in the design stage. The blade shapes are computed using an inverse method. The design is then validated by means of computational fluid dynamics (CFD) computation with a commercial solver. Finally, a prototype was built and measurements were carried out in a test rig. It is also shown that the design method provided very good predictions leading to an efficiency increase of 13 per cent and a maximum flowrate increase of 11 per cent. The design point was also met. It is also shown that the numerical computations and measurements are in good agreement. An analysis of the CFD results is also presented, giving an insight view into the substantial flow information within the old and the new impellers. The method presented is a combined analytical and numerical method suited to design high-efficiency radial impellers considering also the torque-speed characteristic of the motor without the need of a previous impeller series or knowledge of experimental data.