1, the impact of density Ï Seen from the basic equation of the centrifugal pump, centrifugal pump head pressure, flow rate, independent of the density, so the efficiency is a function of density change does not change, so the centrifugal pump by a shaft dynamometer show expression, with the shaft power density of the liquid in the centrifugal pump Change and change, so the original characteristic curve N ~ Q or performance of the shaft power should be converted accordingly: Where, N-- operating conditions, the centrifugal pump shaft power, KW; Ï - operating conditions, the liquid is being transported; N 0 - Shaft power of centrifugal pump under test conditions, KW; Ï 0 - density of fresh water at 20 ° C, kg / m 3 . 2, the impact of viscosity As the loss of flow resistance inside the centrifugal pump is related to the viscosity of the liquid being transported, the viscosity increases and the flow resistance of the liquid passing through the impeller and the casing increases. Therefore, the pressure head reduces the flow rate and reduces the efficiency and increases the shaft power. In general, when the kinematic viscosity of a liquid is ν> 0.2m 2 / s, the following equation should be used for conversion: Where, Q, H, η - for the water flow, head and efficiency; Q ", H", η "- is the liquid flow rate, head and efficiency of the liquid being conveyed; C Q , C H , C η - conversion factor, the value is less than 1. Available from the relevant manuals. 3. Effect of speed n When the centrifugal pump speed changes, the flow, pressure head, shaft power and speed can be converted according to the following proportion of law: Where, Q1, H1, N1 - respectively when the speed of centrifugal pump performance n1; Q2, H2, N2 - Centrifugal pump performance when speed is n2 respectively. It is worth noting that the basic assumption underlying the above relation is that its efficiency is constant after the speed is changed, so that the law of proportion is only right when the speed change is less than 20%. 4. Effect of impeller diameter D2 When the speed of the centrifugal pump n is constant, the pressure head can be seen from the basic equation that the flow rate is related to the diameter D2 of the hour wheel. The change can be converted according to the following cutting law: Where, Q ', H', N '- respectively when the impeller diameter D2' pump performance; Q, H, N - pump performance when the impeller diameter is D2. It is noteworthy that the above relationship is only applicable to the same type of centrifugal pump, use a small diameter impeller, but the diameter should not change. 1, the impact of density Ï Seen from the basic equation of the centrifugal pump, centrifugal pump head pressure, flow rate, independent of the density, so the efficiency is a function of density change does not change, so the centrifugal pump by a shaft dynamometer show expression, with the shaft power density of the liquid in the centrifugal pump Change and change, so the original characteristic curve N ~ Q or performance of the shaft power should be converted accordingly: Where, N-- operating conditions, the centrifugal pump shaft power, KW; Ï - operating conditions, the liquid is being transported; N 0 - Shaft power of centrifugal pump under test conditions, KW; Ï 0 - density of fresh water at 20 ° C, kg / m 3 . 2, the impact of viscosity As the loss of flow resistance inside the centrifugal pump is related to the viscosity of the liquid being transported, the viscosity increases and the flow resistance of the liquid passing through the impeller and the casing increases. Therefore, the pressure head reduces the flow rate and reduces the efficiency and increases the shaft power. In general, when the kinematic viscosity of a liquid is ν> 0.2m 2 / s, the following equation should be used for conversion: Where, Q, H, η - for the water flow, head and efficiency; Q ", H", η "- is the liquid flow rate, head and efficiency of the liquid being conveyed; C Q , C H , C η - conversion factor, the value is less than 1. Available from the relevant manuals. 3. Effect of speed n When the centrifugal pump speed changes, the flow, pressure head, shaft power and speed can be converted according to the following proportion of law: Where, Q1, H1, N1 - respectively when the speed of centrifugal pump performance n1; Q2, H2, N2 - Centrifugal pump performance when speed is n2 respectively. It is worth noting that the basic assumption underlying the above relation is that its efficiency is constant after the speed is changed, so that the law of proportion is only right when the speed change is less than 20%. 4. Effect of impeller diameter D2 When the speed of the centrifugal pump n is constant, the pressure head can be seen from the basic equation that the flow rate is related to the diameter D2 of the hour wheel. The change can be converted according to the following cutting law: Where, Q ', H', N '- respectively when the impeller diameter D2' pump performance; Q, H, N - pump performance when the impeller diameter is D2. It is noteworthy that the above relationship is only applicable to the same type of centrifugal pump, use a small diameter impeller, but the diameter should not change.
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Centrifugal pump production sector provides the characteristic curve is usually at a certain speed and room temperature (20 ℃) ​​under the conditions of water as the transmission medium measured out. If the use of the conditions of use of large differences in the nature of the liquid and water when the transmission is large, you have to consider the physical properties, speed and impact of different impeller diameter. When used should be converted. The following centrifugal pump performance factors and conversion to illustrate. Centrifugal pump production sector provides the characteristic curve is usually at a certain speed and room temperature (20 ℃) ​​under the conditions of water as the transmission medium measured out. If the use of the conditions of use of large differences in the nature of the liquid and water when the transmission is large, you have to consider the physical properties, speed and impact of different impeller diameter. When used should be converted. The following centrifugal pump performance factors and conversion to illustrate.