1.AF泡沫泵输送密度为800kg/m3的油品，实测到泵出口压力表读数为147100Pa，入口真空表读数为300 mmHg,两表测点的垂直距离(表位差)为0.5m.吸入管与排出管直径相同。试求泵的实际扬程。
    2.有一台离心水泵用来输送清水，转速π= 480r/min总扬程H= 136m，流量Q=5.7m3/s,轴功率P= 9860kW,设ηv= ηm=0.92,求水力效率ηh为多少?
    3.某离心油泵装置如图1-115所示。已知管内油面压力PA与油品饱和蒸气压pv相等，该泵转速n=1450r/min.最小汽蚀余量Sh. =k,Q .取安全余量为0.4.则[OM]=0.4+ sh,=0.4+k,Q2，吸入管内流动阻力损失hu=k,Q: ,试分别计算:
    (1)当zg=8m,Q=0.5m3/min时,泵的[NPSH.]=4. 4m,吸入管路阻力损失h:= 2m,此时泵能否正常吸入?
    (2)保持Q=0.5m3/min时,液面下降到什么位置泵开始发生汽蚀?
    (3)当Zg =8m,Q= 0.5m2 /min时，若将泵的转速提高到n' = 2900/min,泵还能否正常吸入?
4.某油库消防泵位于河岸上，泵房内安装一台离心水泵， 如图1- 116所示，使用时水流，吸水管直径为100mm，底阀当量长度为160d(d为直径)，弯头当量长度为22d，阀门当量长度为18d，阻力系数为0.022.试求保证正常吸入时，河底最低页面距泵轴心距离为多少？

5.某台离心泵，在转速1450r/min条件下，当流量Q=30m3/h是，扬程H=60m，轴功率p=7.6kW。 求当转速变为2900 r/min时， 流量、扬程和轴功率各为多少?
6.已知1#泵的特性方程为H=40-0.01Q2 ,2#泵的特性方程为H=60-0.02Q2，根据串联水力特点,写出1#泵和2#泵申联后泵机组的总的特性方程。若两台泵串联后与管路组成一水力系统，管路特性方程为h= 30+0.04Q ,试用解析法确定串联后管路及每台泵的工作点。(方程中Q单位为m/s.H.h单位为m)

The 1.AF foam pump has a density of 800kg/m3 oil, and the reading of the pump outlet pressure gauge is 147100Pa. The entrance vacuum gauge reading is 300 mmHg, and the vertical distance of the two measuring points is the same as the diameter of the suction pipe and the discharge pipe of the 0.5m.. Try to find the actual head of the pump.

2. A centrifugal pump is used to transport clean water. The speed is π = 480r / min, the total head H = 136m, the flow rate q = 5.7m3/s, and the shaft power P = 9860kw. Suppose η v = η M = 0.92, what is the hydraulic efficiency η H?

3. A centrifugal oil pump is shown in Fig. 1-115. The minimum NPSH sh sh. = k, Q. if the safety margin is 0.4, then [om] = 0.4 + sh, = 0.4 + K, Q2, the flow resistance loss in the suction pipe Hu = k, Q: respectively

(1) When ZG = 8m, q = 0.5m3/min, the pump's [NPSH.] = 4.4m, suction pipe resistance loss H: = 2m, can the pump normally inhale?

(2) When q = 0.5m3/min, where does the liquid level drop to and the pump begins to cavitation?

(3) When ZG = 8m, q = 0.5m2/min, if the pump speed is increased to n '= 2900 / min, can the pump still inhale normally?

4. The fire pump of an oil depot is located on the Bank of the river. A centrifugal pump is installed in the pump room, as shown in Fig. 1-116. When using, the diameter of the suction pipe is 100 mm, the equivalent length of the bottom valve is 160 D (D is the diameter), the equivalent length of the elbow is 22 D, the equivalent length of the valve is 18 D, and the resistance coefficient is 0.022?

5. A centrifugal pump, at the speed of 1450r / min, when the flow rate q = 30m3 / h, the head H = 60m, the shaft power P = 7.6kw. When the speed changes to 2900 R / min, what are the flow rate, head and shaft power?

6. It is known that the characteristic equation of 1 × pump is h = 40-0.01q2, and that of 2 × pump is h = 60-0.02q2. According to the hydraulic characteristics of series connection, the general characteristic equation of 1 × pump and 2 × pump unit after application is written. If two pumps are connected in series with pipelines to form a hydraulic system, and the pipeline characteristic equation is h = 30 + 0.04q, the working point of pipelines and each pump after series connection is determined by analytical method. (the unit of Q in the equation is m / s.h.h, the unit is m)