基于Doehlert Matrix的全贯流泵装置定转子进出流间隙优化设计

Optimization Design of Inlet and Outlet Clearance between Stator and Rotor of Full Cross-flow Pump Unit Based on Doehlert Matrix

全贯流泵是一种新型的机电-水泵一体式贯流泵,然而其在运行时存在定转子间隙回流,扰乱了叶轮内的流场分布,导致泵装置产生能量损失、压力波动和噪声等问题,影响泵站的正常运行。通过数值模拟和模型试验研究全贯流泵装置定转子间隙流的水力特性,结合Doehlert Matrix设计-响应面优化法对其定转子进、出流间隙结构进行优化设计,揭示全贯流泵装置定转子进、出流间隙结构对泵装置性能的影响机理,并得到最终优化的折角式定转子进、出流间隙结构方案为:外侧延伸段长度t1为4.921r,外侧收缩段长度x1为0.624r,内侧延伸段长度t2为3.655r,内侧收缩段长度x2为1.6r(r为定转子间隙宽度),使得全贯流泵装置扬程和效率分别提升约10.3%和5.2%。

Full cross-flow pump is a new type of pump with its motor integrated.However,during its operation,the occurrence of clearance backflow between the stator and rotor can disrupt the flow field distribution inside the impeller,leading to energy loss,pressure fluctuations and noise in the pump unit,even affecting the normal operation of the pump station.To understand the influence mechanism of clearance flow on the pump unit,firstly,the hydraulic characteristics of the clearance flow between the stator and rotor of a full cross-flow pump unit was investigated through the methods of numerical simulation and model experiments.Secondly,combined with scheme design method of Doehlert Matrix-response surface optimization,the inlet and outlet clearance structure of the stator and rotor was optimized,with the overall operating efficiency of the unit,the axial velocity uniformity and the average vortex angle at the outlet section of the outlet channel selected as the evaluation indexes.Lastly,the influence mechanism of the inlet and outlet clearance structure of the stator and rotor on the performance of the pump unit was revealed,along with the final optimized scheme for the inlet and outlet clearance between the stator and rotor obtained,that was the outer extension section t_1 was 4.921r,the outer contraction section x_1 was 0.624r,the inner extension section t_2 was 3.655r and the inner contraction section x_2 was 1.6r where r represented the width of the clearance between stator and rotor in which case,the head and the operating efficiency of full cross-flow pump can be improved by around 10.3%and 5.2%,respectively.