Precision Analysis Of Water Pump Compete Characteristic Curve And The Analysis On The Calculation Of Water Hammer Protection

With a range of factors of the rapid development of social economy, the increaseof population and water pollution and the regional rainfall, water resources becomethe main factor restricting the economic development of our country. Under suchsevere form, in order to realize the sustainable utilization of water resources andreasonable distribution, so cross-regional water diversion projects are growing, andoften the water hammer accidents are caused by a variety of different reasons. In viewof this reason, water hammer calculation and protection at home and abroad in recentyears has attracted the attention of the professionals. Water hammer calculation isbased on the basic differential equation of water hammer, turn it into the finitedifference equations which a computer can recognize. Transform pump characteristiccurve into discrete data to do water hammer calculation and analysis and to carry onthe dynamic simulation of the water pipeline operation condition, thus it is concludedthat the best water hammer protection measures and ensure the safety of waterpipeline running. So the water pump characteristic curve plays an important role inthe water hammer calculation.Based on the ratio of revolution Ns=80, Ns=110, Ns=127, Ns=530, Ns=950asthe research object, comprehensively expound that the error of the water pump allcharacteristic curve affects the calculation of water hammer protection. Combinedwith a large number of engineering examples to illustrate, water pump characteristiccurve precision has influence on the calculation of water hammer protection. So thisthesis mainly works as follows:1. Comprehensively expound the meaning of pump characteristic curve and its roleof water hammer protection calculation. Mainly introduce the ratio of revolution Ns=80, Ns=110, Ns=110, Ns=530and Ns=950pumps numerical discrete data. Throughcalculation of the picture reading and combining with a large amount of data, not onlyobtain the pump characteristic curve of all numerical value of the maximum ofdiscrete data, the theoretical value and minimum value, but the numerical value ofcalculation and analysis of three groups of discrete data for the error, thus determine the scope of maximum error.2. Take it as research objects of ChangWuXian level3pump station, HaJiaDianlevel2pump station and TingKou level1pump station. Apply all three groups ofdiscrete data of the pump characteristic curve calculates water hammer protection.Conclude the corresponding highest water head envelope line and the lowest waterhead envelope line. And carry on the comparative analysis.3. Still with ChangWuXian level3pump station as an example，calculate the ratioof revolution of the project Ns=80, then put the ratio of revolution three sets ofdiscrete data of Ns=110, Ns=127, Ns=530and Ns=950into the ratio of revolutionNs=80corresponding water hammer computation program of three groups of discretedata to calculate water hammer. Under the same conditions, ratio of revolution ofdifferent pumps affects the calculation of water hammer protection.