A Method for Calculating Pressure of Prime Escape Water Hammer in Water Supply System

A water supply system, water hammer pressure technology, applied in the direction of calculation, special data processing applications, instruments, etc., can solve the problems of low precision, high precision of characteristic line method, large amount of calculation and so on

Active Publication Date: 2017-09-19
HOHAI UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For the current problems: the characteristic line method has high precision but a large amount of calculation, while the Permakin graphical method and Tomizawa Kiyoshi graphical method solve simple but low precision problems

Method used

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  • A Method for Calculating Pressure of Prime Escape Water Hammer in Water Supply System
  • A Method for Calculating Pressure of Prime Escape Water Hammer in Water Supply System
  • A Method for Calculating Pressure of Prime Escape Water Hammer in Water Supply System

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Embodiment Construction

[0056] The water delivery system of a pressurized pumping station, see Figure 4 , the water delivery pipe is steel pipe, the diameter of the pipe is 2200mm, the length of the pipe is 8.38km, the elevation of the center line of the pipe is 15m, and the wave velocity of water hammer is 1000m / s ; The elevation of the upper reservoir is 20m, the elevation of the lower reservoir is 66m, and the design water supply flow rate is 5m 3 / s ; Horizontal single-stage double-suction centrifugal pumps are used, the two pumps are connected in parallel for water supply, and the rated lift of the pumps is 52 m , the rated flow rate is 2.6m 3 / s, rated speed 600r p m, unit flywheel moment GD 2 2600k g m 2 , The motor power is 1800kW.

[0057] Prime Minister fly away water hammer formula calculation

[0058] 1. Assuming that the prime minister escapes water hammer, the escape point of the water pump at the end of the prime minister is:

[0059]

[0060] Therefore, the escape point...

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Abstract

The invention discloses a water supply system premier escape water hammer pressure calculating method comprising the following steps: relating water pump running characteristics and pipeline water hammer propagation characteristics with premier escape water hammer characteristics, thus obtaining premier escape water hammer determination conditions and a calculating formula; using the premier escape water hammer formula to directly calculate single pumping capacity and post-pumping pressure dropping value of the water pump at the premier end moment under the escape status, and using premier escape water hammer determination formula to verify the solved single pumping capacity, thus verifying premier escape water hammer assumed correctness and calculated post-pumping pressure dropping value validity. The novel method can provide theory basis for stop pumping water hammer theory research and pressurization water supply system premier escape water hammer protection, thus fast estimating the post-pumping pressure maximum dropping value with high precision, omitting complex value simulation calculating, completing stop pumping water hammer theory system, and providing very big scientific research and real application values.

Description

technical field [0001] The invention relates to a method for calculating the water hammer pressure of the prime minister of a water supply system, which belongs to the field of water conservancy and hydropower engineering. Background technique [0002] Due to the unbalanced distribution of water resources in our country, the unbalanced regional production and economic development, water pollution and other reasons, the water supply in some areas is tense. Therefore, many water supply projects have been built in my country to alleviate the water shortage in the region. Except for gravity flow water supply under a few terrain conditions, most water supply projects need to use pressurized water supply. In the case of no water hammer protection measures in the water supply system, once the power failure of the water pump occurs, the pressure in the pipeline behind the water pump will drop too much. If the pressure in the pipeline is reduced to the vaporization pressure of wate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 范呈昱张健俞晓东陈胜罗浩蒋梦露
Owner HOHAI UNIV
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