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Method for calculating resistance coefficient of arbitrarily combined bent pipe

A resistance coefficient and calculation method technology, applied in the direction of calculation, electrical digital data processing, special data processing applications, etc., can solve the problem that no specific and practical calculation method is proposed for the calculation of the resistance coefficient of any combination of elbows, and achieve a simple and convenient calculation method. The total resistance coefficient is accurate and the effect of wide application range

Inactive Publication Date: 2015-02-04
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0066] It can be seen from the above that Idelichik. Handbook of hydraulic resistance (3rd Edition) [B]. New York: Jaico Publishing House, 2008, although some geometric parameters are given to calculate the resistance coefficient of a specific combination of elbows, but for any combination of elbows The calculation of the drag coefficient does not propose a specific and practical calculation method

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  • Method for calculating resistance coefficient of arbitrarily combined bent pipe
  • Method for calculating resistance coefficient of arbitrarily combined bent pipe
  • Method for calculating resistance coefficient of arbitrarily combined bent pipe

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Embodiment Construction

[0103] Such as Figure 11 As shown, it is an arbitrary combination of bends with 9 bends and 8 lengths of connecting segments, and only its axis is displayed for intuitiveness. Then from the entrance to the exit at the left end are the 1st, 2...i...9 bends respectively, and the corresponding relationship between the number of the bends and the relative radius of curvature is shown in the following table:

[0104]

[0105] The straight pipe section between the first bend and the second bend is defined as the length of the first connecting section, and the lengths of the 1st, 2...j...8 connecting sections from the inlet at the left end to the outlet are respectively, and the number of the connecting section and the relative connection The corresponding relationship between segment lengths is shown in the following table:

[0106]

[0107] Assume that the fluid flow in the elbow is no longer affected by the Re number, that is, Re≥2×10 5 , the calculation method of its res...

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Abstract

The invention discloses a method for calculating a resistance coefficient of an arbitrarily combined bent pipe. The method for calculating the resistance coefficient of the arbitrarily combined bent pipe is characterized in that the resistance coefficient of each elbow and each connecting section straight pipe is obtained through a parameter correction method, then the resistance coefficient of each part is superposed and thus the resistance coefficient of the entire combined bent pipe is calculated. The method for calculating the resistance coefficient of the arbitrarily combined bent pipe can be used for calculating the resistance coefficient of the combined bent pipe with different relative curvature radiuses and connecting section lengths, and the result is more accurate and reliable.

Description

technical field [0001] The invention relates to a calculation method for the resistance coefficient of curved pipes, in particular to a calculation method for the resistance coefficient of any combination of 90° bend pipes in the same plane. Background technique [0002] As a common phenomenon, the flow of fluid in the elbow is widely used in industrial equipment such as engine systems, heating devices, ventilation equipment, gas and natural gas transmission, thermal power plants and nuclear power cooling water circulation systems. Resistance coefficient is an extremely important hydraulic parameter in pipeline design, and a correct grasp of its law will help improve the rationality of design. [0003] According to the principle of dimensional analysis, for the incompressible flow in the circular cross-section pipe, the fluid resistance coefficient caused by the deformable parts is: [0004] ζ=△P / (1 / 2ρ·V 2 )=ζ(δ,R / D,Re) (1) [0005] In the formula, △P is the total pressur...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 张镜洋成锋娜常海萍
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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