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采用目前最新設(shè)計(jì)方法設(shè)計(jì)渣漿泵
如水力設(shè)計(jì)數(shù)值計(jì)算方法，可以使泵的效率有較大提高。數(shù)值計(jì)算方法大致內(nèi)容如下:渣漿泵磨損取決于濃度和速度的局部值，因此在評價(jià)磨損之前，必須計(jì)算速度場和濃度場。流體和固體顆粒運(yùn)動的數(shù)學(xué)模型，需將運(yùn)動微分方程變?yōu)殡x散形式。離散方程，根據(jù)初始條件和邊界條件采用選代法求解。二維模型保證研究離心渣漿泵內(nèi)流動和磨損的簡單相對近似。應(yīng)用二維或者三維計(jì)算確定整個(gè)流動速度場，就可以計(jì)算顆粒運(yùn)動軌跡。這些計(jì)算以動量方程為依據(jù)，考慮顆粒的慣性一離心力和阻力等.
《文章，研究葉片數(shù)、葉片入口和出口安放角、葉輪出口寬度、葉型等因素對泵性能的影響，得出下列兒點(diǎn)結(jié)論:
1)葉片形狀對揚(yáng)程比HR和效率比ER有很大的影響。2)當(dāng)弗勞德數(shù)Fr增加時(shí)，將導(dǎo)致HR和ER數(shù)值提高。
3)葉片入口角(β=18"~26*) 和出口角(β=26"和63)，葉片數(shù)Z=2~6,葉輪出口寬度b2和比轉(zhuǎn)數(shù)N,=0.43~0.56,在上述幾何尺寸范圍內(nèi)對泵性能沒有很大影響。
4)固體顆粒粒徑對HR和ER有不同的影響，在高濃度、細(xì)顆粒時(shí)，ER<HR,在中等濃度、大顆粒時(shí)，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.
