Technical help: Pipeline flow calculation?
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This post was last edited by hesonchang214 on 2010-1-31 07:34. The editor asked a question often used by chemical companies. How to estimate the general pipeline flow rate. For example, the pipeline is DN200, the fluid is water, the pressure at a certain point is 5 kg, and the terminal is open. How to estimate the flow rate at this point? ? Is there any estimation formula?
You can calculate it using Bernoulli's equation. The formula in fluid mechanics, z1+p1/ρg +v12/2g=z2+p2/ρg +v22/2g+(ζ+λL/d)v2/2g
I mean is there a simple estimation formula??
Well, I also want an empirical formula, which is an empirical valuation method that can be known quickly! ! ! Wait for the hero to clear up the confusion.
Flow measurement 1. Velocity measuring tube 1. Structure as shown in Figure 2. Principle: The velocity measuring tube measures the punching energy from the inner tube. The difference between the punching energy and the static pressure at the measuring point measured by the outer tube of the tachometer is determined by the reading of the liquid column differential pressure gauge. For correction, add a coefficient c=0.9-1.0 U differential pressure gauge = 3. Notes: The velocity measuring tube can only measure the local flow velocity of the fluid at a certain point on the cross section. To obtain the average flow velocity on the pipe cross section, the velocity measuring pipe mouth can be placed on the center line of the pipe to measure the maximum flow velocity of the fluid and calculate it based on the findings.
Bernoulli's equation is already relatively simple.
The meaning of Bernoulli's equation is that an ideal fluid flowing stably in a tube has three forms of energy: pressure energy, potential energy and kinetic energy. These three energies can be converted into each other on any cross-section, but their sum does not become a constant, that is, energy conservation. But if you want to find the speed at a certain point, you must know what this constant is. How to find it? ? ? ? ?
Then you should ask the experienced employees.~
I once downloaded a small paper from the Internet, which was about estimating the water replenishment volume of fire pools under different pressure conditions (different pipe diameters), but I will not upload it. It is in a picture format.
Forgot to mention, the paper is called Water Pressure and Flow Estimation (1) (2), you can search it online. I think this is quite practical
9# zhonghua668 Can you share your paper with me?