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The new law of large diameter pipe flow monitoring


Still prevalent in the water supply industry is a difficult problem. Commonly used electromagnetic flow meter, ultrasonic flow meter, Venturi flow meter, turbine flow meter and plug-average rate of flow meters and other large diameter pipe flow measurement devices, there are varying degrees of accuracy, stability and cost issues . In order to solve these problems well, this article Carmen Plant a formula based on theoretical analysis, a new method of measuring flow. 2 Monitoring the movement of the fluid there are two types of layer and turbulent flow. The actual project,[link widoczny dla zalogowanych], the general flow pattern inside the tube are turbulent, and turbulence can be divided into plain tube, transition and rough district. According to the experimental data for a Carmen Plant, proposed for turbulent flow velocity distribution of all three areas index formula: =. (Chi) (1) or = (Chi) (2) 2 R,, where: R a pipe radius of a horizontal distance from the wall counting axis at a flow rate of the average speed of a pipeline section from the wall of a y points with Reynolds number R and the velocity of a change index (see table below) that equation (2) on the left of V = 1, can be obtained with different (or R) value of the condition,[link widoczny dla zalogowanych], the point of average velocity of flow and the pipe is equal to position, the results below. It can be seen, the ancient: 0.2453 ~ 0.2367, the change is small, averaging y = 0.242 as the average velocity of pipe measuring point. Therefore, at this point as long as the installation of simple structure,[link widoczny dla zalogowanych], high precision Pitot pressure measured by the value of this point, you can inquire the pipe mean velocity, ie: table of point velocity and the pipe is equal to average velocity measurement of the position and velocity Error R4.0 �� 1032.3 �� 101.1 �� 1051.1 �� 102.0 �� 103.2 �� 101111116.06.67.08,81010 _ b 0.24530.24340.24230.23850.23670.2367R ( Chi) 0.242} V-2nR0.23% 0.09% 0.02% 0.17% 0.22% 0.22% lV: Vo242R = K ~ / 2gh (3) Q = VF = KF ~ / 2gh (4) where: Q a flow F of a pipe section area, F = rrR0.242R at a point away from the wall 0.242R velocity correction factor K of a Pitot Pitot pressure values of a gravitational acceleration g of a 3 error of ll as the index, verify that the current method of measuring the reliability of the results see table above. Can be seen in the context of the turbulent flow,[link widoczny dla zalogowanych], pipe average velocity and Y = 0.242R point velocity at a very consistent error of 0.23% or less. These results demonstrate that instead of using o242R is entirely feasible. 4 Conclusion (1) the flow monitoring methods, equipment,[link widoczny dla zalogowanych], simple structure with high precision, fast, and can achieve line continuous measurement and so on. (2) This method is particularly suitable for large diameter DN �� 300mm diameter pipeline flow measurement.

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[link widoczny dla zalogowanych]

[link widoczny dla zalogowanych]

[link widoczny dla zalogowanych]