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采用目前最新设计方法设计渣浆泵
添加时间:2019.09.07

采用目前最新设计方法设计渣浆泵

   如水力设计数值计算方法,可以使泵的效率有较大提高。数值计算方法大致内容如下:渣浆泵磨损取决于浓度和速度的局部值,因此在评价磨损之前,必须计算速度场和浓度场。流体和固体颗粒运动的数学模型,需将运动微分方程变为离散形式。离散方程,根据初始条件和边界条件采用选代法求解。二维模型保证研究离心渣浆泵内流动和磨损的简单相对近似。应用二维或者三维计算确定整个流动速度场,就可以计算颗粒运动轨迹。这些计算以动量方程为依据,考虑颗粒的惯性一离心力和阻力等.
   1992年,澳大利亚C.I.沃克等发表《叶轮几何形状对离心式渣浆泵性能的影响》文章,研究叶片数、叶片入口和出口安放角、叶轮出口宽度、叶型等因素对泵性能的影响,得出下列儿点结论:
1)叶片形状对扬程比HR和效率比ER有很大的影响。2)当弗劳德数Fr增加时,将导致HR和ER数值提高。
3)叶片入口角(β=18"~26*) 和出口角(β=26"和63),叶片数Z=2~6,叶轮出口宽度b2和比转数N,=0.43~0.56,在上述几何尺寸范围内对泵性能没有很大影响。
4)固体颗粒粒径对HR和ER有不同的影响,在高浓度、细颗粒时,ER<HR,在中等浓度、大颗粒时,HR≈ER。

Design of Slurry Pump by Using the Latest Design Method




For example, the numerical calculation method of hydraulic design can greatly improve the efficiency of the pump. The numerical calculation method is as follows: the wear of slurry pump depends on the local values of concentration and velocity, so the velocity field and concentration field must be calculated before evaluating wear. Mathematical models of fluid and solid particle motion need to transform differential equations of motion into discrete forms. The discrete equation is solved by the substitution method according to the initial and boundary conditions. The two-dimensional model ensures a simple relative approximation of flow and wear in a centrifugal slurry pump. The particle trajectory can be calculated by using two-dimensional or three-dimensional calculation to determine the whole flow velocity field. These calculations are based on the momentum equation and take into account the inertia-centrifugal force and resistance of particles.


In 1992, C.I. Walker et al. published an article entitled "The influence of impeller geometry on the performance of centrifugal slurry pump", which studied the influence of blade number, blade inlet and outlet placement angle, impeller outlet width and blade shape on pump performance. The following conclusions were drawn:


1) Blade shape has great influence on lift ratio HR and efficiency ratio ER. 2) When the Froude number Fr increases, the HR and ER values will increase.


3) blade inlet angle (beta=18"~26*) and outlet angle (beta=26" and 63), blade number Z=2~6, impeller outlet width B 2 and specific speed N,=0.43~0.56, have no significant influence on pump performance in the above geometric size range.


4) Solid particle size has different effects on HR and ER. At high concentration and fine particle size, ER < HR, and at medium concentration and large particle size, HR ER.