B. r.詹德曼假定固体颗粒在叶轮叶片入口的浓度重新分布强度用Co JC/gD参数表征(式中，Co、D。为液体入口速度和叶轮入口直径)。
詹德曼提出假定，由上述方法确定的磨损不均勾性是参数? JC1sD.的函数。这个假定可以概括试验研究资料。表3 7 3列出叶片边磨损不均匀性 Kn与参数比C/ED.之间的关系。
Effect of Slurry Pump Carrier Parameters on Blade Wear
The influence of carrier density and viscosity on the wear of impeller blades is described below. When the liquid density increases, the number of particles falling on the surface of the entrance decreases, that is, wear decreases. In addition, the hydraulic roughness (i.e. settling velocity) of particles in the runner between the blades decreases, so the concentration on the working surface of the blade decreases, which will lead to the decrease of the wear on the blade surface. When the viscosity increases, the Reynolds number decreases and the resistance coefficient increases under the same other conditions, so the wear decreases.
The above conclusions are representative of hydraulic abrasive wear, but not suitable for erosion and cavitation wear. It should be considered that the damage of impeller parts caused by cavitation and erosion is much less than that caused by hydraulic abrasion. It may affect the service life of pump parts only when conveying light abrasion solid-liquid mixture.
According to the size and structure of pump blades, the wear characteristics and strength of impeller blades are analyzed for the optimal or near optimal state of a pump, i.e. the optimal flow rate Q or near the optimal flow rate. The operation practice of the pump for conveying abrasive solid-liquid mixture shows that the wear characteristics and strength of impeller, especially the inlet section of impeller, change with the working state of the pump.
In the corresponding acceleration field, the movement characteristics and settling speed of solid particles are related to the particle movement state in the carrier medium, i.e. Reynolds number. The larger Reynolds number indicates the self-model state of particle motion. At this time, the particle motion resistance is related to the quadratic of its velocity, and the head-on drag coefficient C is a constant value. The smaller Reynolds number indicates that the moving resistance of solid particles is not a quadratic function of velocity, and the resistance coefficient of particles is variable.
In the self-model state, there will be the maximum particle head-on resistance, that is to say, in this case, when the centripetal acceleration is the same, the particle settlement velocity in the impeller inlet motion is less than that in the non-self-model state where the particle movement resistance is proportional to its velocity less than the quadratic square. At the same acceleration field, the larger particles move at a larger velocity than the smaller particles, and the Reynolds number of the larger particles is correspondingly larger. This shows that the resistance coefficient of large particles is smaller than that of small particles, that is to say, the resistance coefficient C indirectly represents the coarseness of particles.
B. R. Jendman assumed that the redistribution strength of solid particles at the inlet of impeller blades was characterized by Co JC/gD parameters (formulas, Co, D). For liquid inlet velocity and impeller inlet diameter.
The inhomogeneity of solid particle distribution represents the inhomogeneity of wear at the entrance, which can be evaluated by the following methods. The average linear wear is equal to the ratio of the wear surface area of the blade to its width along the inlet edge. The wear inhomogeneity can be assumed to be the ratio of the maximum linear wear of the blade to its average value. If the blade edge wear is uniform, then the wear surface of the blade will appear rectangular shape, the average wear is equal to the maximum value, that is, their ratio is equal to 1; if the wear surface is triangular, the wear inhomogeneity of the inlet edge is equal to 2.
Janderman proposed the assumption that the wear nonuniformity determined by the above method is a function of parameter JC1sD. This assumption can summarize the experimental data. Table 373 shows the relationship between Kn and C/ED.
From these data, we can see that the parameters are live JE/gD. The increase of the blade size leads to the smaller wear of the blade entrance. Slurry Pump Manufacturer