泵的特性曲线
1.光滑管阻力系数实验
表
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1.光滑管阻力系数实验数据表
管径 d=0.008m 管长 l=1.695m
3-3定性温度 T=20.0? 密度ρ=998.2 kg/m 粘度 μ=1.005*10Pa.s
流量编号 压差Pf(kpa) 流速u(m/s) Re λ 3Q(m/h)
1 0 0.0196 0 0 ? 2 0.01 0.0490 0.0553 439.4066 0.1517 3 0.02 0.1079 0.1106 878.8133 0.0834 4 0.04 0.2452 0.2212 1757.6266 0.0474 5 0.06 0.5297 0.3318 2636.4399 0.0455 6 0.08 0.8239 0.4424 3515.2532 0.0398 7 0.09 1.0005 0.4977 3954.6598 0.0382 8 0.104 1.0 0.5751 4569.8291 0.0325 9 0.205 4.2 1.1337 9007.8362 0.0309 10 0.421 14.1 2.3281 18499.0197 0.0246 11 0.511 19.1 2.8258 22453.6795 0.0226
以编号2的数据为例,计算如下:
,,
2πQQ
,du
4A
3
0.01m/s,3600s/h
,,0.0553m/s,2
,(0.008m)
4
,3,,,8,10,0.0553,998.2du
Re,,,439.4066,3 ,1.005,10
,332,,2,8,10,0.0490,10dPf
,,,,0.151722 ,,998.2,1.695,0.0553,lu
2.粗糙管阻力系数实验
表2.粗糙管阻力系数实验数据表
管径 d=10mm 管长 l=1.695m
-3-3定性温度 T=21.0? 密度ρ=998.2 kg/m 粘度 μ=1.005*10Pa.s
流量压差Pf编号 流速(um/s) Re λ -3Q(m/h) (kpa)
1 0.102 5.3 0.3608 3619.1295 0.4814 2 0.156 10.7 0.5518 5535.1392 0.4155 3 0.206 15.7 0.7286 7309.2223 0.3496 4 0.253 20.8 0.8948 8976.8604 0.3071 5 0.312 27.7 1.1035 11070.2785 0.2689 6 0.355 34.1 1.2556 12595.9900 0.2557 7 0.404 41.7 1.4289 14334.5914 0.2414 8 0.449 49.4 1.5881 15931.2662 0.2315 9 0.497 57.6 1.7578 17634.3859 0.2203 10 0.556 67.1 1.9665 19727.8040 0.2051 11 0.600 79.3 2.1221 21288.9971 0.2081 12 0.662 93.2 2.3414 23488.8601 0.2010 13 0.803 134.4 2.8401 28491.7745 0.1970 14 0.896 169.6 3.1690 31791.5690 0.1996
以编号1的数据为例,计算如下:
,,
2πQQ
,du
4A
3
0.102m/s,3600s/h
,,0.3608m/s,2
,(0.010m)
4
,3,,,10,10,0.3608,998.2du
Re,,,3619.1295,3 ,1.005,10
,332,,dPf2,10,10,5.3,10,,,,0.581422 ,,998.2,1.695,0.3608,lu
3.局部阻力系数实验
表3.局部阻力系数实验数据表
3内径 d=0.020m 定性温度 T=22.0? 密度ρ=998.2 kg/m
流量近端压差 远端压差流速u局部阻力压 局部阻力 编号 3Q(m/h) P1(kpa) P2(kpa) (m/s) 差Pf(kpa) 系数ζ 1 0.02 0.2452 0.2060 0.0177 0.2845 1.8225 2 0.03 0.3924 0.3924 0.0265 0.3924 1.1172 3 0.04 0.5885 0.5983 0.0354 0.5787 0.8570 4 0.05 0.5983 0.6081 0.0442 0.5885 0.6033 5 0.062 0.5983 0.5983 0.0548 0.5983 0.3989 6 0.07 0.5297 0.5199 0.0619 0.5395 0.2822 7 0.08 0.5297 0.5395 0.0707 0.5199 0.2082 8 0.09 0.5297 0.5395 0.0796 0.5199 0.1645
以编号1的数据为例,计算如下:
,,QQπ2u,dA4
3
0.02m/s,3600s/h
,,0.0177m/s
,2
,(0.02m)
4
Pf,2P,P21
,2,0.2060,02452,0.2845kpa
,,2Pf20.2845,,
,,,,,,,,1.8225,,22,, ,u998.20.0177,,,,
泵的特性曲线
3液体温度 T=22.5? 密度ρ=998.2 kg/m 泵出入口高度差 ?Z=0.25 m
入口压出口压电机功流量压头轴功率有效功编号 力p1力p2u u η(%) 入出3率(kw) Q(m/h) H/m.s N/w 率Ne/w (kpa) (kpa)
1 -6.6 51.5 0.77 12.02 3.28 2.41 5.93 462.00 193.90 41.97 2 -6.6 51.5 0.77 12.01 3.28 2.41 5.93 462.00 193.76 41.94 3 -6.5 55.6 0.78 11.93 3.26 2.39 6.34 468.00 205.83 43.98 4 -6.4 58.6 0.78 11.81 3.22 2.37 6.64 468.00 213.43 45.61 5 -6.0 63.1 0.79 11.63 3.18 2.33 7.07 474.00 223.66 47.19 6 -5.7 69.6 0.79 11.36 3.10 2.28 7.71 474.00 238.37 50.29 7 -5.1 76.5 0.80 11.00 3.00 2.21 8.37 480.00 250.48 52.18 8 -4.5 85.7 0.79 10.50 2.87 2.11 9.27 474.00 264.72 55.85 9 -3.7 96.8 0.79 9.79 2.67 1.96 10.35 474.00 275.50 58.12 10 -2.5 110.0 0.77 8.80 2.40 1.77 11.60 462.00 277.74 60.12 11 -1.6 125.5 0.74 7.71 2.11 1.55 13.13 444.00 275.27 62.00 12 -0.5 143.5 0.71 6.55 1.79 1.31 14.88 426.00 265.12 62.23
以编号1计算举例: ,,
2πQQ,d入u
4A3
12.02m/s,3600s/h
,,3.28m/s,2
,(0.036m)
4
,,
2πQQ
,du出
4A
3
12.02m/s,3600s/h,,2.41m/s,2
,(0.042m)
4
22u,uP,P
21H,Z-Z,,
入出g2g入出,
2251.5,6.62.41,3.28,0.25,,,5.93m 998.2,9.812,9.81
N,功率表读数,电机效率,0.77kw,60%,462.00w
Ne,HQ,g,5.93,12.02,3600,998.2,9.81,193.90w
Ne193.90,,,100%,,100%,41.97% N452.00
泵的特性曲线