渣浆泵浆体管路损失确定方法研究概况
    浆体管路水头损失，随着浆体中所含固体颗粒粒径、固体物相对密度、浆体浓度等因素的不同而变化。浆体管路水头损失是以清水管路水头损失为基础。下面简要介绍一下浆体管路损失确定方法研究概况。

一、均质浆体管路水头损失确定方法
    固体物料所有固体颗粒小于0. lmm,重量浓度C≤30%，体积浓度C≤15%的浆体，属于均质浆体，不需考虑固体颗粒的沉降。其管路水头损失与清水时基本相同。因此，水头损失和管路特性曲线，可以按照清水时的办法求得.

二、典型浆体管路水头损失确定方法
    典型浆体是指固体颗粒粒径dso =0.1~03mm,重量浓度C_≤40%，体积浓度C.≤20%的浆体。
    沃曼公司在选型手册中认为，这类渣浆泵浆体的管路水头损失有如下特点:在同样的管路条件下，当浆体流速为其临界沉降流速的0.7倍(V=0.7V.) 时浆体的水头损失与清水以浆体临界沉降流速流动(v=V2) 时的水头损失相同;当浆体流速为其临界沉降流速的1.3倍(V=1.3V2)时，浆体水头损失与清水以同样流速流动时的水头损失相同。将上述情况示在H V坐标系中，如图1-4- 1所示，用曲线将点C和B连接起来且在点B处相切，就得到浆体管路特性(阻力)出线。
    三、非典型浆体管路水头损失研究方法
非典型浆体是指固体额粒径da>0.3mm、体积液度c,≤20%的某体，确定这种浆体管路锁失的方法是，将流速V-V,时清水水头损失作为浆体水头损失，而浆体损失与清水时水头损失相同时的流速计算（何希杰已给出了具体表达式），再用光滑曲线将这两点连接起来，就可以得到浆体管路损失曲线。
如果给定浆体有关参数C. di.)和现场工况条件，就可以算出V.、K和K，值，这样根据上述公式确定不同流速V时的浆体管路水头损失H.值然后根据选型程序，计算有关参数值，就可以选择适合现场工况条件要求的泵型。

Overview of research on determination method of slurry pipeline loss in slurry pump

The head loss of slurry pipeline varies with the size of solid particles, the relative density of solid and the concentration of slurry. The head loss of slurry pipeline is based on the head loss of clear water pipeline. The following is a brief introduction of slurry pipeline loss determination methods.

1. Method to Determine Head Loss of Homogeneous Slurry Pipeline

All solid particles of solid material are less than 0. lmm, and the slurry with weight concentration C < 30% and volume concentration C < 15%. It belongs to homogeneous slurry and does not need to consider the settling of solid particles. The head loss of pipeline is basically the same as that of clear water. Therefore, the head loss and pipeline characteristic curve can be obtained according to the method of clear water.

2. Determination of Head Loss in Typical Slurry Pipeline

Typical slurry is slurry with solid particle size DSO = 0.1~03mm, weight concentration C less than 40%, volume concentration C less than 20%.

In the selection manual, Walman Company considers that the head loss of slurry in the slurry pipeline of this kind of slurry pump has the following characteristics: under the same pipeline conditions, when the slurry velocity is 0.7 times of its critical sedimentation velocity (V=0.7V.), the head loss of slurry is the same as that of clear water flowing at the slurry critical sedimentation velocity (V=V2); When the critical sedimentation velocity is 1.3 times (V=1.3V2), the head loss of slurry is the same as that of clear water when it flows at the same velocity. The above situation is shown in the H-V coordinate system. As shown in Fig. 1-4-1, the slurry pipeline characteristics (resistance) can be obtained by connecting points C and B with curves and tangential at point B.

3. Research methods of head loss in atypical slurry pipelines

Atypical slurry refers to a body with solid particle size Da > 0.3mm, volume liquid degree C and less than 20%. The method to determine the lock-in loss of slurry pipeline is to take the loss of clear water head as slurry head loss when the flow velocity V-V, and calculate the flow velocity when the slurry loss is the same as that of clear water head (He Xijie has given the specific expression), and then use it. By connecting these two points with smooth curve, slurry pipeline loss curve can be obtained.

Given the parameters C. di.) of slurry and the working conditions on site, the values of V., K and K can be calculated, so that the head loss H. of slurry pipeline at different flow velocities V can be determined according to the above formulas, and then the relevant parameters can be calculated according to the selection program, so that the pump type suitable for the working conditions on site can be selected.