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Method for constructing turbulence model by spatial filtering method

A construction method and technology of turbulent flow model, applied in the direction of fluid flow, mechanical equipment, etc., can solve problems such as output (insufficient efficiency, large-scale unit vibration, etc.)

Inactive Publication Date: 2011-08-03
SHANGHAI EAST PUMP(GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Judging from the operation of large-scale pumping stations and hydropower stations that have been put into operation, problems such as vibration, cavitation, and insufficient output (efficiency) generally exist in large-scale units.

Method used

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  • Method for constructing turbulence model by spatial filtering method
  • Method for constructing turbulence model by spatial filtering method
  • Method for constructing turbulence model by spatial filtering method

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Embodiment

[0033] Such as figure 1 Shown, the spatial filtering method of the present invention establishes the construction method of turbulence model, and it comprises the steps:

[0034] (1) The filter function is constructed by the finite volume method, and the instantaneous Navier-Stokes equation is filtered. Under the absolute reference system in the form of Cartesian coordinates, the control equation of the instantaneous flow state is established as:

[0035] ∂ ∂ t ( ρ u ‾ i ) + ∂ ∂ x j ( ρ u ‾ i u ‾ j ) = - ...

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Abstract

The invention aims to disclose a method for constructing a turbulence model by a spatial filtering method. By simulating full-channel turbulence of an axial-flow pump of the turbulence model, corresponding flow details can be obtained, flowing in all flow passage components can be qualitatively recognized, the energy and cavitation performance of the axial-flow pump can be estimated quantitatively according to a calculation result, and the mechanisms of important hydraulic characteristics such as hydraulic cavitation, hydraulic vibration and the like are disclosed, so that theoretical and technical basis is provided for researching and developing a water pump or a water turbine device with high performance, large flow and a high water head and the aim of the invention is fulfilled.

Description

technical field [0001] The invention relates to a construction method, in particular to a construction method for establishing a turbulence model through a space filtering method in a hydraulic machine. Background technique [0002] With the construction of the South-to-North Water Diversion Project and the Three Gorges Water Conservancy Project, water pumps and turbines, as key hydraulic mechanical devices, are constantly increasing in capacity and size. Judging from the operation of large-scale pumping stations and hydropower stations that have been put into operation, problems such as vibration, cavitation, and insufficient output (efficiency) commonly exist in large-scale units. Characteristics such as vibration and cavitation are directly related to the water pressure pulsation of the flow-passing parts. The key to solving these problems is to effectively grasp and control the flow field of the corresponding flow-passing parts. [0003] Observations show that the inter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15D1/00
Inventor 吴永旭魏培茹见文
Owner SHANGHAI EAST PUMP(GRP) CO LTD
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