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渣漿泵內(nèi)部局部阻力管道損失的計(jì)算
局部阻力損失計(jì)算公式
四、阻力損失的簡(jiǎn)便近似計(jì)算
上述計(jì)算方法是比較繁復(fù)的，有時(shí)為了計(jì)算方便可用下面簡(jiǎn)便近似的計(jì)算方法:可按表1-6，將各種局部阻力損失折合成直管長(zhǎng)度并與直管長(zhǎng)相加得出總長(zhǎng)度，然后查表1-7、表1 -8,得每100m直管損失的水頭，計(jì)算出總的阻力損失水頭。
要說明的是這種方法雖然簡(jiǎn)單，但不很精確，只適合于計(jì)算有困難的人員或是只需要近似計(jì)算的情況下使用。
五、 舉例計(jì)算阻力損失
[例]設(shè)有離心泵的管路裝置，流量Q=90m3/h,進(jìn)出管均為鋼管，管內(nèi)徑D=100m,直管總長(zhǎng)度L= 50m,進(jìn)水管上有感同底網(wǎng)1個(gè)，90°彎頭1個(gè)，出水管上有同網(wǎng)(全開) 1個(gè)，逆止閥1個(gè)，90°彎頭2個(gè)，試求進(jìn)出管的總阻力損失。
[解1] 用系數(shù)計(jì)算法
查表1-1,常溫(T=20°C)的水v=10.11x10-7m2/s 渣漿泵
Calculation of loss of local resistance pipe in slurry pump
Calculation formula of local resistance loss
4. Simple approximate calculation of resistance loss
The above calculation method is more complicated. Sometimes, for the convenience of calculation, the following simple and approximate calculation method can be used: according to table 1-6, all kinds of local resistance losses can be converted into straight pipe length and the total length can be added with the straight pipe length. Then, check table 1-7 and table 1-8 to get the loss head of every 100m straight pipe and calculate the total resistance loss head.
It should be noted that although this method is simple, it is not very accurate, and it is only suitable for those who have difficulty in calculation or only need approximate calculation.
V. example calculation of resistance loss
[example] for the pipeline device with centrifugal pump, the flow rate is q = 90m3 / h, the inlet and outlet pipes are all steel pipes, the inner diameter of the pipe is d = 100m, the total length of the straight pipe is L = 50m, the inlet pipe has a sense of the same bottom network, a 90 ° elbow, the outlet pipe has a same network (fully open), a check valve and two 90 ° elbows, and the total resistance loss of the inlet and outlet pipe is tested.
Coefficient calculation method for [solution 1]
Refer to Table 1-1, normal temperature (t = 20 ° C) water v = 10.11x10-7m2/s slurry pump
