摘要：在采用加大流量法等优化措施的同时,运用FLUENT流体计算软件及GAMBIT前处理软件,采用三维K-ε双模型方程对泵内部流场进行模拟仿真,再从优化泵内流动特性的角度出发,确定合理的优化措施,设计了一台高扬程、高转速、高效率、能在大流量范围稳定工作的液体火箭发动机用超低比转速离心泵。对比试验验证表明,这种结合内流场特性的优化设计是可行的,而且快速高效。

摘要：基于冷却塔用水轮机工作环境的特点,对全流道进行三维定常数值模拟,对比分析了超低比转速混流式水轮机与常规发电用水轮机参数选择设计的不同,并通过合理选择参数和数值模拟优化,开发出一种高性能的超低比转速混流式水轮机。算例分析表明,该新型水轮机不仅节能,还可以达到带动风扇旋转散热的目的,为其他行业合理利用富余能源提供了借鉴。

摘要：超薄离心式微泵,作为便携电子设备中的液冷散热系统的关键部件,它的水力部件的尺寸受到严格限制,结构特性导致轮毂比很大,而且小流量大扬程的技术要求导致整机的比转速极低。运用传统的设计方法很难设计出高效并且性能优异的水力模型。本文采用速度系数法和CFD水力仿真技术相结合的方法,探究了叶片长度,叶片出口宽度,叶片数等参数对于微泵水力性能的影响。最后得到一个优化的超薄离心式微型泵的水力模型。

摘要：The ultra-low specific speed centrifugal blower is widely used in energy industries due to its features such as low flow rate,high pressure and low manufacturing cost. However,the width-to-diameter ratio of the above blower becomes relatively small to satisfy the needed operation condition and its performances are considerably degraded as a result of relatively high leakage,disc friction and passage friction loss consequently. The purpose of this paper is to improve its performance through the optimization design of the blade’s profile properly. Based on artificial neural networks (ANN) and hierarchical fair competition genetic algorithms with dynamic niche (HFCDN-GAs),the optimization design approach is established. By conjoining Bezier parameterization and FINE/TURBO solver,the optimized blade is designed by adjusting the profile gradually. An industrial ultra-low specific speed centrifugal blower with parallel hub and shroud has been selected as a reference case for optimization design. The performance investigations of the centrifugal blowers with different types of blades are conducted. The conclusions of the performance improvement of the optimized blade provide positive evidences in the application of the optimization design of the above blower blade.