基于速度矩守恒的离心泵节能蜗壳断面几何参数求解

发布时间：2018-05-23 15:58

本文选题：离心泵 + 设计　；参考：《农业工程学报》2017年20期

【摘要】：螺旋形蜗壳是离心泵的基本压水室形式,降低蜗壳中的流动损失是提高泵效率的重要措施。分析表明,蜗壳各轴面断面的周长是决定蜗壳中水力损失的重要因素。在传统的蜗壳设计方法中,并未重视蜗壳湿周与蜗壳水力损失的关系,也未将改善蜗壳断面几何特征作为产生节能产品的设计目标。该文以速度矩守恒原理为依据,在保证蜗壳断面入口无显著扩散的条件下,提出了实现蜗壳断面最小湿周的理念与实现方法。利用等面积图形中圆具有最小周长的几何特征,该文给出了与现行蜗壳断面有区别的断面确定原则,并根据断面要求通过的不同流量形成了2种减小断面湿周的断面新结构。由于这种断面几何参数没有解析解,该文给出了它们详尽的数值求解方法与过程。事实证明,该文提出的方法对改善泵效率有积极效果,在设计点附近的提高幅度均达到1.6%。该文设计的断面蜗壳有望成为实现改善泵效率这一预期目标的可行结构。
[Abstract]:Spiral volute is the basic pressure chamber of centrifugal pump. It is an important measure to improve pump efficiency to reduce the flow loss in the volute. The analysis shows that the circumference of each axial section of the volute is an important factor to determine the hydraulic loss in the volute. In the traditional volute design method, no attention has been paid to the relationship between the wet circumference of the volute and the hydraulic loss of the volute, and the improvement of the geometric characteristics of the volute section has not been regarded as the design objective of producing energy-saving products. Based on the principle of conservation of velocity and moment, the idea and method of realizing the minimum wet circumference of the volute section are put forward under the condition that there is no significant diffusion at the entrance of the volute section. Based on the geometric feature that the circle has the minimum circumference in the iso-area pattern, this paper presents the principle of section determination which is different from the existing volute section, and according to the different flow rate required by the section, two new cross-section structures are formed to reduce the wet circumference of the section. Since there are no analytical solutions to these section geometric parameters, this paper presents their detailed numerical solution methods and processes. It is proved that the method proposed in this paper has a positive effect on improving pump efficiency, with an increase of 1.6 in the vicinity of the design point. The section volute designed in this paper is expected to be a feasible structure to achieve the desired goal of improving pump efficiency.
【作者单位】：流体及动力机械教育部重点实验室(西华大学);西华大学能源与动力工程学院;成都市永益泵业有限公司;
【基金】：国家自然科学基金资助项目(51279172) 流体及动力机械教育部重点实验室(西华大学)项目(SZJJ2015-41)
【分类号】：TH311

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