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Quick determination method of low-Reynolds-number airfoil laminar-separation-bubble length

A determination method, a technology of laminar flow separation, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of increased airfoil resistance, long grid drawing time flow field calculation time, thickening, etc.

Inactive Publication Date: 2018-05-18
TIANJIN JINHANG COMP TECH RES INST
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Problems solved by technology

[0002] In the actual use of low Reynolds number airfoils in the field of new energy, the appearance of laminar flow separation bubbles actually thickens the airfoil boundary layer, leading to adverse effects such as increased airfoil drag
The academic community usually uses computational fluid dynamics (CFD) to predict the size of the laminar flow separation bubble on the low Reynolds number airfoil, but to calculate accurately, it takes a long time to draw the grid and calculate the flow field, and it needs to be correct Choose a turbulence model to ensure the accuracy of the results

Method used

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  • Quick determination method of low-Reynolds-number airfoil laminar-separation-bubble length
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  • Quick determination method of low-Reynolds-number airfoil laminar-separation-bubble length

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Embodiment Construction

[0073] In order to make the purpose, content, and advantages of the present invention clearer, the specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0074] In order to quickly predict the laminar flow separation bubble size of a low Reynolds number airfoil, the present invention proposes an engineering analysis method based on the thin airfoil and boundary layer theory of viscous and inviscid interaction, which can quickly determine the low Reynolds number airfoil layer Flow separation bubble length, including the following steps:

[0075] 2. Using Thin Airfoil Theory to Predict Inviscid Flow Velocity on Airfoil Surface

[0076] 2.1. Determining the curvature and thickness equations

[0077] Consider a typical thin airfoil such as figure 1 shown. Let the chord line of the airfoil be AB, where A is the leading edge point and B is the trailing edge point. The mid...

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Abstract

The invention relates to a quick determination method of low-Reynolds-number airfoil laminar-separation-bubble length, and relates to the technical field of low-Reynolds-number tool devices. Accordingto the method, flow field information including airfoil surface velocity is output through inviscid-thin-airfoil theory calculation, then flow field information in a viscid boundary layer is quicklyobtained through calculation of a related boundary layer model, and separation, transition and in-attachment status of a laminar separation bubble is effectively output. The method is realized by adopting Fortran 90 self-compiling, and is used for studying the laminar separation bubble of aerodynamic performance of dominant airfoil under a low Reynolds number.

Description

technical field [0001] The invention relates to the technical field of low Reynolds number tool devices, in particular to a method for quickly determining the length of a laminar flow separation bubble of a low Reynolds number airfoil. Background technique [0002] In the actual use of low Reynolds number airfoils in the field of new energy, the appearance of laminar flow separation bubbles actually thickens the airfoil boundary layer, leading to adverse effects such as increased airfoil drag. The academic community usually uses computational fluid dynamics (CFD) to predict the size of the laminar flow separation bubble on the low Reynolds number airfoil, but to calculate accurately, it takes a long time to draw the grid and calculate the flow field, and it needs to be correct The turbulence model was chosen to ensure the accuracy of the results. Contents of the invention [0003] (1) Technical problems to be solved [0004] The technical problem to be solved by the pres...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/15G06F30/20G06F30/333Y02T90/00
Inventor 沈翔张轮袁盾
Owner TIANJIN JINHANG COMP TECH RES INST