Method for predicting fluid-solid coupled characteristic value of elastic hydrofoil

A fluid-structure coupling and prediction method technology, applied in special data processing applications, electrical digital data processing, instruments, etc., can solve the problems of elastic hydrofoil flow field structure and dynamic characteristics, lack of elastic hydrofoil numerical prediction method, etc.

Inactive Publication Date: 2015-01-21
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

At present, most of the research work on the flow around hydrofoils is based on rigid objects. There are relatively few studies on the flow field structure and dynamic characteristics of elastic hydrofoils, and there is a lack of systematic numerical prediction methods for the fluid-solid coupling characteristics of elastic hydrofoils.

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  • Method for predicting fluid-solid coupled characteristic value of elastic hydrofoil
  • Method for predicting fluid-solid coupled characteristic value of elastic hydrofoil
  • Method for predicting fluid-solid coupled characteristic value of elastic hydrofoil

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Embodiment 1

[0040] A numerical prediction method for fluid-solid coupling characteristics of elastic hydrofoils, such as figure 1 As shown, it is mainly realized by the following steps:

[0041] Step 1: Establish a two-dimensional watershed and hydrofoil geometric model

[0042] For a given hydrofoil, a two-dimensional watershed and hydrofoil geometric model is established in the pre-processing software ICEM CFD. The material of the hydrofoil is POM, and the main material properties are: elastic modulus E=3000MPa, density ρ=1480kg / s, Poisson's ratio 0.35. The elastic deformation of the hydrofoil is simplified as follows: figure 2 As shown: one end of the hydrofoil is fixed, and the other end is a free end. The elastic deformation of the hydrofoil along the span direction is ignored, and only the vibration deformation h of the section of the free end along the vertical direction and the rotational deformation θ around the central axis are considered.

[0043] Step 2: 2D watershed grid ...

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Abstract

The invention relates to a method for predicting a fluid-solid coupled characteristic value of an elastic hydrofoil and belongs to the technical field of turbomachinery simulation. The method comprises the steps of establishing a two-dimensional drainage basin-hydrofoil geometric model, dividing the gridding of a two-dimensional drainage basin, establishing a computational fluid mechanical model, calculating an initial steady flow field value and an unsteady flow field fluid-solid coupled value, and then performing after-processing on the calculation results to obtain the dynamic change process of the deformation of the flow field structure and the hydrofoil with time. The method for predicting the fluid-solid coupled characteristic value of the elastic hydrofoil has the advantages that the influence of an added mass effect on flowing is taken into account so that the stability of value calculation and the reliability of a numerical prediction result are improved, quick high-accuracy numerical prediction on an oscillation phenomenon induced by flowing around the elastic hydrofoil can be realized, and the flexibility of selection of numerical computation methods can be enhanced by virtue of secondary development of computational fluid mechanical software in combination with an embedded fluid-solid coupled algorithm.

Description

technical field [0001] The invention relates to a numerical prediction method for fluid-solid coupling characteristics of an elastic hydrofoil, which belongs to the technical field of turbomachinery simulation. Background technique [0002] In recent years, with the development of technology, the wide use of composite materials makes hydraulic machinery have the characteristics of low vibration, low noise, light weight and high efficiency, and corrosion resistance. At the same time, there is a fluid-solid coupling effect between the flow field and the structure. The water in the flow channel interacts with the blades to promote the rotation of the runner. At the same time, the unstable water flow will induce the vibration of the blades, and the vibration of the blades will also affect the rotor in turn. A turbulent structure that flows around it. Therefore, it has more practical engineering value and scientific significance to explore the laws of fluid-solid coupling intera...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 黄彪吴钦王国玉
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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