关于流量、压力、管径、流速的关系

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1、关于流量、压力、管径、流速的关系  2010-04-1712:43:04

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4、字号大中小 订阅一般工程上计算时，水管路，压力常见为0.1--0.6MPa，水在水管中流速在1--3米/秒，常取1.5米/秒。流量=管截面积X流速=0.002827X管径^2X流速(立方米/小时)^2：平方。管径单位：mm管径=sqrt(353.68X流量/流速)sqrt：开平方饱和蒸汽的公式与水相同，只是流速一般取20--40米/秒。如果需要精确计算就要先假定流速，再根据水的粘度、密度及管径先计算出雷诺准数，再由雷诺准数计算出沿

5、程阻力系数，并将管路中的管件（如三通、弯头、阀门、变径等）都查表查出等效管长度，最后由沿程阻力系数与管路总长（包括等效管长度）计算出总管路压力损失，并根据伯努利计算出实际流速，再次用实际流速按以上过程计算，直至两者接近（叠代试算法）。因此实际中很少友人这么算，基本上都是根据压差的大小选不同的流速，按最前面的方法计算。波努力方程好像对于气体等可压缩流体不适用阿管道横截面积为AA＝派D^2/4Q＝A×v 水管管径-流速-流量对照表(轻松解决你算管径问题)每次画图都要算出管径，你只要对照此表就能看出来！经验：1.重力流，流速比较小。一般选0

6、.8-1.0    2.压力流，流速比较大，一般选1.0-1.5管径/流速/流量对照表管径(DN)流量m3/h0.4m/s0.6m/s0.8m/s1.0m/s1.2m/s1.4m/s1.6m/s1.8m/s2.0m/s2.2m/s2.4m/s2.6m/s2.8m/s3.0m/s200.50.70.91.11.41.61.82.02.32.52.72.93.23.4250.71.11.41.82.12.52.83.23.53.94.24.64.95.3321.21.72.32.93.54.14.65.25.86.46.97.58.18.

7、7401.82.73.64.55.46.37.28.19.010.010.911.812.713.6502.84.25.77.18.59.911.312.714.115.617.018.419.821.2654.87.29.611.914.316.719.121.523.926.328.731.133.435.8807.210.914.518.121.725.329.032.636.239.843.447.050.754.310011.317.022.628.333.939.645.250.956.562.267.973.579.28

8、4.812517.726.535.344.253.061.970.779.588.497.2106.0114.9123.7132.515025.438.250.963.676.389.1101.8114.5127.2140.0152.7165.4178.1190.920045.267.990.5113.1135.7158.3181.0203.6226.2248.8271.4294.1316.7339.325070.7106.0141.4176.7212.1247.4282.7318.1353.4388.8424.1459.5494.8

9、530.1300101.8152.7203.6254.5305.4356.3407.1458.0508.9559.8610.7661.6712.5763.4350138.5207.8277.1346.4415.6484.9554.2623.4692.7762.0831.3900.5969.81039.1400181.0271.4361.9452.4542.9633.3723.8814.3904.8995.31085.71176.21266.71357.2450229.0343.5458.0572.6687.1801.6916.1103

10、0.61145.11259.61374.11488.61603.21717.7500282.7424.1565.5706.9848.2989.61131.01272.31413.71555.11696.51837.81979.22120.6600407.1610.7814.31017.91221.41425.01628.61832.22035.72239.32442.92646.52850.03053.6管径(DN)流速推荐值m/s:20253240506580100125150200250300350400闭式系统0.5-0.60.

11、6-0.70.7-0.90.8-10.9-1.21.1-1.41.2-1.61.3-1.81.5-2.01.6-2.21.8-2.51.8-2.61.9-2.91.6-2.51.8-2.6开式系统0.4-0.50.5-0