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Basic Study on High Efficiency Operation and Surge Control of Axial Flow Pump with Contra-Rotating Rotors

对转转子轴流泵高效运行及喘振控制基础研究

基本信息

批准号：
12450077
负责人：
FURUKAWA Akinori
金额：
$ 9.28万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12450077/
关键词：
Turbo-type Axial Flow Pump Contra-Rotating Rotors Pump Efficiency Cavitation Performance Blade Rows Interaction Blade Row Design

项目摘要

Design concepts and an experimental validation of the contra-rotating axial flow pump, consisting of front and rear rotors instead of a rear stator of conventional type and rotating in opposite directions each other, were discussed for improving of pump performances in the range of higher specific speed. Experimental results showed that using contra-rotating type was an efficient means of recovering the swirl kinetic energy without the use of stator and a means with wider range of high efficiency. It was also demonstrated that the reverse flow and cavitation inception could be postponed in the contra-rotating axial flow pump as compared with the conventional type. As the specified pump head and maximum efficiency of designed rotors, however, were not satisfied at design point, the rear rotor was redesigned. Experimental data for two types of rear rotors under the same front rotor were compared and appropriate design parameters were discussed to obtain higher performance of rear rotor. Results were as follows: The stagger angle should be selected with considering the output flow of front rotor. Adopting thinner blade with low solidity for rear rotor yielded higher efficiency at design point but at the off design-points the efficiency and cavitation occurrence were deteriorated. By the control of rear rotor rotational speed the wider operating range with high efficiency and cavitation performance was achieved especially in the case of rear rotor with higher efficiency at the design point.

为了提高泵在较高比转速范围内的性能，本文讨论了用前后转子代替传统的后定子，并使前后转子反向旋转的对旋轴流泵的设计思想和实验验证。实验结果表明，采用对旋式是一种不需要静叶就能回收旋流动能的有效方法，且具有较宽的高效范围。与常规轴流泵相比，对旋轴流泵的反流和汽蚀发生时间有所推迟。由于设计的转子在设计点不能满足规定的扬程和最大效率，因此对后转子进行了重新设计。比较了两种后旋翼在同一前旋翼下的试验数据，探讨了获得更高性能后旋翼的合理设计参数。结果表明：安装角的选择应考虑前转子的输出流量。后旋翼采用低稠度薄叶片，在设计点效率较高，但在非设计点效率和空化发生恶化。通过对后转子转速的控制，可以实现更宽的工作范围，特别是在设计点后转子效率较高的情况下，具有较高的效率和空化性能。