叶片布置方式对双吸离心泵径向力的影响

为研究叶片布置方式对双吸离心泵径向力的影响,在其他外部因素不变的情况下,对3种叶片布置方案的离心泵进行非定常模拟计算,结果表明:较对称布置方案,采用交错30°布置的叶片能够有效提高离心泵的扬程,采用交错15°布置的叶片对离心泵扬程具有消极影响.同时,采用交错布置方案会导致离心泵的效率下降;在设计工况下,与对称布置方案相比,叶片采用交错布置能够有效降低离心泵内的压力脉动水平,且交错角度越大,压力脉动水平降低的越明显.叶片采用交错布置能够有效降低作用在叶轮上的稳态径向力的大小,其中采用交错30°布置方案在1.1Q_d工况下稳态径向力相对降低42.284%.最后,叶片采用交错30°布置对改善叶轮所受瞬态径向力的脉动特性与幅值大小的效果最为明显.

Effect of blade arrangement on radial force of double suction centrifugal pump

In order to study the influence of blade arrangement on the radial force of double suction centrifugal pump,the unsteady simulation calculation of three blade arrangement scheme was carried out under the condition that other external factors remain unchanged.The results show that compared with the symmetrical arrangement scheme,the staggered 30°blade arrangement can effectively improve the head of centrifugal pump,and the staggered 15°blade has a negative effect on the head of centrifugal pump.At the same time,the efficiency of the centrifugal pump will be reduced by using the staggered arrangement scheme.Under the design condition,compared with the symmetrical arrangement scheme,the staggered arrangement of the blades can effectively reduce the pressure pulsation level in the centrifugal pump,and the larger the stagger angle,the more obvious the pressure pulsation level decreases.The staggered arrangement of blades can effectively reduce the magnitude of the steady-state radial force acting on the impeller,and the staggered arrangement of 30°can reduce the steady-state radial force by 42.28%under the condition of 1.1Qd.In the end,the staggered 30°arrangement of the blades has the most obviously effect on improving the pulsation characteristics and amplitude of the transient radial force on the impeller.