Method for calculating head loss coefficient and branch pipe flow distribution of multi-point water intake

Patent metadata

Field	Value
Publication number	US-12393753-B2
Application number	US-202117440668-A
Country	US
Kind code	B2
Filing date	Mar 19, 2021
Priority date	Jun 18, 2020
Publication date	Aug 19, 2025
Grant date	Aug 19, 2025

Abstract

The present invention relates to a method for calculating a head loss coefficient and branch pipe flow distribution of a multi-point water intake. The method includes the following steps: inputting and determining a structure and size information of the multi-point water intake; determining a head loss coefficient; determining a head loss coefficient form of a confluence port; pre-estimating or adjusting a trial flow; performing trial calculation on the head loss coefficient of each branch pipe; comparing the head losses calculated by two flow paths; and carrying out overall calculation. According to the present invention, the flow of each branch pipe is adjusted and the head loss coefficient is repeatedly calculated by utilizing iterative calculation of the head loss coefficients of the flows in two directions, so that the head loss and the flow distribution proportion can be finally and accurately calculated.

First claim

The invention claimed is:

1. A method for calculating a head loss coefficient and branch pipe flow distribution of a multi-point water intake, for designing a structure of a multi-point water intake facility which comprises a main pipe, provided with a plurality of confluence ports, buried in a water bottom seabed, branch pipes each vertically connected to a corresponding one of the confluence ports, and water-absorbing heads each immersed in water and arranged at a top end of each branch pipe, the method comprising the following steps:
step 1: inputting and determining a structure and size information of the main pipe, the plurality of confluence ports and the branch pipes, wherein, the structure and size information comprise cross sectional area A of the main pipe of the multi-point water intake, a shape of each branch pipe, a length l i of the branch pipes and cross sectional area A i of the branch pipes, a smooth radius r of a confluence port of the branch pipe and the main pipe, a spacing L between the branch pipes, a flow Reynolds number Re and a rough height of a pipe material, wherein i is a serial number of the branch pipes arranged from upstream to downstream and is equal to 1, 2 . . . , n;
step 2: determining local pipeline resistance coefficients of the water-absorbing heads and on-way friction resistance coefficients of the main pipe and the branch pipes, wherein, determining a local resistance coefficient K in of the water-absorbing head and an on-way friction resistance coefficient K f of the main pipe and the branch pipes;
step 3: determining a head loss coefficient at the confluence port according to the structure and size information and the local pipeline resistance coefficients of the water-absorbing heads and on-way friction resistance coefficients of the main pipe and the branch pipes, wherein, determining a calculation form of a head loss coefficient K →c of a confluence pipe according to shapes of the branch pipes and the main pipe, a flow area ratio, a confluence port angle and the smooth radius and according to a Gardel formula, wherein a loss coefficient of an i-th confluence port comprises a flowing loss coefficient of the branch pipes K i, b→c of an i-th branch pipe and a penetrating flow loss coefficient K i, t→c of flowing through the i-th confluence port from the upstream main pipe, the form of the Gardel formula is as follows:

K

t

→
"\[Rule]"

c

=

0.03

(

1
-

R
Q

)

2

-

R
Q
2

⁢

{

1
+

(

1.62
-

r
0.5

)

[

cos
⁡
(

π
-
θ

)

R
A

-
1

]

-

0.38

(

1
-

R
A

)

}

+

(

2
-

R
A

)

⁢

(

1
-

R
Q

)

⁢

R
Q

K

b

→
"\[Rule]"

c

=

-
0.92

(

1
-

)

2

-

R
Q
2

⁢

{

(

1.2
-

r
0.5

)

[

cos
⁡
(

π
-
θ

)

R
A

-
1

]

Assignees

• China Three Gorges Corp
• China Inst Water Resources & Hydropower Res

Inventors

• Dai Huichao
• Wang Hao
• Duan Yafei
• Ji Ping
• Zhao Yijun
• Jiang Dingguo
• Zhao Hanqing

Classifications

• G06Q10/0631

  Resource planning, allocation, distributing or scheduling for enterprises or organisations · CPC title

• G06F30/18

  Network design, e.g. design based on topological or interconnect aspects of utility systems, piping, heating ventilation air conditioning [HVAC] or cabling (circuit design at the physical level G06F30/39; network planning tools for wireless communication networks H04W16/18) · CPC title

• G06F2113/14

  Pipes · CPC title

• G06Q10/06

  Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling · CPC title

• G06F30/28 Primary

  using fluid dynamics, e.g. using Navier-Stokes equations or computational fluid dynamics [CFD] · CPC title