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Calculation method of minimum wall pressure coefficient of orifice plate

A calculation method, orifice plate technology, applied in electrical digital data processing, construction, instruments, etc., can solve problems such as less research on the minimum wall pressure coefficient of orifice plates

Inactive Publication Date: 2020-11-03
ZHEJIANG OCEAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although there are many studies on the hydraulic characteristics of orifice plates, there are few studies on the minimum wall pressure coefficient of orifice plates.

Method used

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  • Calculation method of minimum wall pressure coefficient of orifice plate
  • Calculation method of minimum wall pressure coefficient of orifice plate
  • Calculation method of minimum wall pressure coefficient of orifice plate

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Embodiment Construction

[0038] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0039] In the engineering research of orifice plate energy dissipation, the minimum wall pressure characteristic of orifice plate is closely related to the anti-cavitation damage ability of orifice plate, which is an important index of orifice plate design.

[0040] The minimum wall pressure characteristic of the orifice plate can be described by the minimum wall pressure coefficient of the orifice plate, and the definition formula of the minimum wall pressure coefficient of the orifice plate is:

[0041] C min =(P ∞ -p min ) / (0.5ρu 2 ) (1)

[0042] In formula (1), C min is the minimum wall pressure coefficient of the orifice plate, p ∞ is the average pressure of the undisturbed section in front of the orifice plate, usually the undisturbed section of the orifice plate is taken at the position 0.5D in front of the orifice plate, D is the...

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Abstract

The invention relates to a computing method for a minimum wall pressure coefficient of a pore plate. The computing method comprises the following steps of setting two working conditions, and obtaining pressure intensity data in each detecting position in a test. Namely, the minimum wall pressure coefficient of the pore plate is calculated based on different aperture ratios and Reynolds numbers under a working condition of a fixed thickness-diameter ratio. The minimum wall pressure coefficient of the pore plate is calculated based on different thickness-diameter ratios and Reynolds numbers under the working condition of the fixed aperture ratio. The data are drawn into a fitted curve, and further an empirical calculating formula for the minimum wall pressure coefficient of the pore plate is obtained according to the fitted curve. The computing method for the minimum wall pressure coefficient of the pore plate is high in calculating speed and small in error, and can provide reference for determining the minimum wall pressure coefficient of the pore plate in engineering design.

Description

technical field [0001] The invention relates to the technical field of water conservancy engineering, in particular to a calculation method for the minimum wall pressure coefficient of a flat-head orifice plate. Background technique [0002] In hydropower engineering projects, high dams are used more and more, according to the paper "A general review on the layout of hydro-junction and technique of flood discharge and energy dissipation" in the journal Water Resources and Water Engineering in issue 2(2) For highdams in China, the dam heights of the Jinping Class I Hydropower Project and the Shuangjiangkou Hydropower Project in Sichuan Province reached 305m and 315m respectively. The water flow released by the high dam has huge energy, how to eliminate the huge energy released by the high dam is an important issue before the majority of hydropower workers. [0003] According to the records of the paper "Hydrauliccharacteristics and optimization of orifice plate discharge tun...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/13E02B1/00G06F119/14
CPCY02A10/40
Inventor 艾万政周琦淦学甄刘虎张洪刚
Owner ZHEJIANG OCEAN UNIV
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