A method for constructing a long-distance gravity flow pipeline water hammer calculation model

By using the characteristic method and iterative calculation based on hydraulic formulas, a calculation model for water hammer in long-distance gravity flow pipelines was established, which solved the problem of inaccurate calculation results in existing technologies and realized accurate simulation of water hammer waves in pipelines and ensured safe operation.

CN115809528BActive Publication Date: 2026-06-19CHINA POWER CONSRTUCTION GRP GUIYANG SURVEY & DESIGN INST CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA POWER CONSRTUCTION GRP GUIYANG SURVEY & DESIGN INST CO LTD
Filing Date
2021-09-13
Publication Date
2026-06-19

AI Technical Summary

⚠Technical Problem

Existing methods for calculating water hammer in long-distance pipelines have inaccurate results, which threatens the safe operation of pipelines.

⚗Method used

A calculation model for water hammer in long-distance gravity flow pipelines based on fundamental hydraulic formulas is adopted. The pipeline is divided into time and space using the characteristic method to establish a water column separation model. Iterative calculations are then used to simulate pressure changes during valve closure.

🎯Benefits of technology

It achieves accurate simulation of the water hammer wave propagation process after the valve at the end of a long pipeline is closed, finds the optimal valve closing time, avoids water column separation, and ensures the safe operation of the pipeline system.

✦ Generated by Eureka AI based on patent content.

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Abstract

This invention discloses a method for constructing a water hammer calculation model for a long-distance gravity flow pipeline, comprising the following steps: obtaining basic pipeline information and boundary point information as input parameters for model calculation; dividing the pipeline into N integer segments based on the basic pipeline information and assuming a calculation time step Δt; calculating the flow rate from the first segment to the Nth segment of the pipeline according to the simple free outflow formula for pipelines; calculating the head loss along the pipeline from the first segment to the Nth segment, and calculating the head H at N+1 nodes. i Save H i Data; calculate the flow rate and head at the (j+1)th Δt time. Based on the water column separation model, determine whether water column separation has occurred, and calculate the Hmax and Hmin values ​​after water column separation is resolved to obtain the pressure envelope along the pipeline. The method of this invention divides the pipeline into time and space, establishes a water column separation model, and accurately simulates the pressure changes during the valve closure process through iterative calculation.
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