基于内流分析的低比转数离心泵设计与改进

Design and Improvements of Centrifugal Pumps with Low Specific Number of Speeds based on Inner Flow Analysis

为设计效率高、性能稳定的低比转数离心泵,结合传统的速度系数法和内部流动分析技术进行了水力设计和改进。给出了低比转数离心泵的初步设计思路、内部流动分析和性能预测方法,基于速度系数法设计的模型的实验结果验证了数值方法的合理性。在初步设计基础上,针对传统设计难以把握的蜗壳关键尺寸参数对性能的影响进行了分析,以此为依据对关键结构与参数进行改进设计,数值模拟和实验表明,改进设计使性能得到了提高。该设计方法与流程的采用,可有效提高泵的水力性能的同时减少试验次数,从而缩短了离心泵产品开发周期。

Hydraulic design and improvements were performed using the traditional velocity coefficient method and the inner flow analysis technique in order to design high-efficient and stable-performance centrifugal pumps with low specific number of speeds. The primary design thought, inner flow analysis, and performance predication of the centrifugal pumps with low specific number of speeds were given, the experimental result of the model designed based on the velocity coefficient method verified the rationality of numerical method. Based on the basic design, the influence of the key size parameters of the volute that were difficult to be controlled by the traditional design on the performance of the centrifugal pumps was analyzed, and the key structures and parameters were designed and improved based on the analysis, numerical simulations and experiments show that the improved design raised the performance of the centrifugal pumps. The applications of the design and process can increase the hydraulic performance of the centrifugal pumps and reduce experimental times, shorten the development period of the centrifugal pumps.