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Gamma-Re theta t transition model calibration method considering transition disturbance factor

A calibration method and transition technology, applied in design optimization/simulation, CAD numerical modeling, special data processing applications, etc., to achieve the effect of improving accuracy

Active Publication Date: 2021-04-02
XIAMEN UNIV
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Problems solved by technology

So far, there is no transition criterion specifically for the characteristics of different disturbance factors

Method used

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  • Gamma-Re theta t transition model calibration method considering transition disturbance factor
  • Gamma-Re theta t transition model calibration method considering transition disturbance factor
  • Gamma-Re theta t transition model calibration method considering transition disturbance factor

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Embodiment Construction

[0028] The following embodiments will further illustrate the present invention in conjunction with the accompanying drawings.

[0029] The present invention takes the impact of rough particles on the transition of the boundary layer into consideration as an example. The main construction process of the proposed method is detailed in figure 1 . The main method of this embodiment is as follows:

[0030] 1. In view of the fact that the classic plate calculation example can simulate the basic fluid flow behavior and the calculation time is less, the γ-Re θt For the transition model, the incoming flow velocity u is 5.4m / s, the incoming flow turbulence degree Tu is 3.3%, and the viscosity ratio μ T / μ is 12.0 and the density is 1.2kg / m 3 , with a dynamic viscosity of 1.8×10 -5 Numerical simulation and analysis were carried out on the subsonic T3A classic plate boundary layer transition example to verify the effectiveness of the transition model program.

[0031] 2. Using unimpr...

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Abstract

The invention discloses a gamma-Re theta t transition model calibration method considering a transition disturbance factor, and relates to the field of boundary layer flow transition. According to theuniversal calibration method, a transition model considering disturbance factors gamma Re theta t such as coarse particles, transverse flow and wakes is provided, the related characteristics of the disturbance factors are analyzed, the universal form of a transition criterion is introduced, and the function relationship between the transition criterion coefficient alpha and the disturbance factorcharacteristic parameter relationship database is fitted by establishing the transition criterion coefficient alpha and the disturbance factor characteristic parameter relationship database; on thisbasis, the transition prediction object can match a transition criterion corresponding to the disturbance factor characteristic parameter based on the disturbance factor characteristic parameter. Theaccuracy of predicting the transition position of the boundary layer under the influence of the disturbance factor by the gamma-Re theta t transition model is improved, Meanwhile, the application of the model under different disturbance factor characteristics is expanded.

Description

technical field [0001] The invention relates to the field of boundary layer flow transition, in particular to a γ-Re θt Calibration method of transition model. Background technique [0002] In the process of aircraft design, boundary layer transition is one of the key issues that must be considered. For traditional aircraft, whether the boundary layer transition calculation is accurate will involve the efficiency and safety of the aircraft control. For turbomachinery such as engine compressors and turbines, carrying out boundary layer transition calculations will not only help reveal the boundary layer The flow mechanism of the transition will also improve the stability of operation and the reliability of the design; because the heat transfer coefficient of turbulent flow in the boundary layer is different from that of laminar flow, the use of traditional full laminar flow or full turbulent flow calculation methods will lead to large error. If the transition position and ...

Claims

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Application Information

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IPC IPC(8): G06F30/28G06F30/17G06F30/15G06F111/10G06F113/08G06F119/14
CPCG06F30/28G06F30/17G06F30/15G06F2111/10G06F2113/08G06F2119/14
Inventor 邱若凡鲍越周康尤延铖闫成
Owner XIAMEN UNIV
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