Multidimensional hydraulic system transient simulation method based on coupling of finite difference method and finite volume method
A finite difference method and finite volume technology, which is applied in special data processing applications, instruments, electrical digital data processing, etc., to achieve the effect of simple method, saving calculation time, and accurate simulation method
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0049] Embodiment 1: The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.
[0050] The concrete steps of the inventive method are as follows:
[0051] Step 1. Using the finite difference method-Pressimann space four-point implicit scheme to discretize the one-dimensional unsteady flow control equation of the pressurized pipeline. The governing equations for the unsteady flow in a one-dimensional prism pipe neglecting the slope term are continuity equation (1) and momentum equation (2):
[0052]
[0053]
[0054] Among them, x and t are space and time coordinates, V is the average velocity of the section, H is the head of the piezometric tube, A is the cross-sectional area of the pipeline, f is the Darcy-Weisbach friction coefficient, α is the wave velocity, g is the acceleration of gravity, D is the diameter of the pipe.
[0055] Using a four-point implicit differential scheme in Preissmann spa...
example 1
[0247] Such as Figure 8 As shown, in a hydropower station, in order to measure the pressure in the pipeline, the annular pipe device is often used to measure the pressure pulsation electrically. The reason is that the diameter of the pipeline in the hydropower station is generally large, and the pressure at different points on the same section of the vertical axis may be quite different. The ring device is used to reduce the pressure directly measured at a point on the pipe wall due to pressure fluctuations. Unreliable effects, the average pressure of a section is approximated by the annular communication pipe device, and the reliability of pressure measurement is improved.
[0248] Since the direction of the pipe axis of the ring device is perpendicular to the direction of the water flow in the pipe under test, generally there is no or only a small flow of water in the ring device. A large pressure difference will cause the change of the water flow in the annular pipe, and ...
example 2
[0250] in such as Figure 9 In power stations with long diversion or tailrace tunnels as shown, bifurcated pipes are often used to connect multiple units to the pressure main or tailwater pipeline. On the one hand, at the same time, different units may be in different operating states, for example, some units are in normal operation, while other units are in the process of load shedding, resulting in complex flow patterns in the branch pipes; on the other hand, due to the There are pipes with variable cross-sections in the pipe, and the bifurcation points make the pressure propagation show complex reflection, superposition and other phenomena, which in turn affect the changes of other parameters in the system.
[0251] The coupling method of one-dimensional finite difference method and three-dimensional finite volume method is used to calculate the hydraulic transient process caused by unit load shedding in hydropower stations with bifurcated pipes, such as Figure 9 As shown...
PUM
Login to view more Abstract
Description
Claims
Application Information
Login to view more - R&D Engineer
- R&D Manager
- IP Professional
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap