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Direct-partitioning fuel gas main flow and disk cavity secondary flow coupling calculation method

A calculation method and secondary flow technology, applied in calculation, instrumentation, electrical digital data processing, etc., can solve problems such as the inability to obtain prediction accuracy, achieve the effects of shortening the design cycle, improving the engineering design process, and improving accuracy

Inactive Publication Date: 2015-09-02
CHONGQING UNIV +1
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Problems solved by technology

Although the above processing schemes can all obtain calculation results with a certain accuracy, the selected turbulence model is only suitable for some areas in the coupled flow field, so the best prediction accuracy cannot be obtained. How to improve the calculation method and improve the quality of simulation results , is obviously a problem worthy of serious study

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Embodiment Construction

[0018] For a specific high-pressure turbine part, the technical solution of the present invention comprises the following steps when realized:

[0019] Step 1: The commercial software Fluent is used to simulate the gas main flow and the secondary flow of the cavity respectively, and the prediction accuracy of different turbulence models is evaluated. Through comparison, it is found that the S-A model has the best prediction accuracy for the main flow of gas, and the secondary flow of the cavity The performance of the SST k-ω model is the best. Based on this, in the partition coupling calculation, the S-A model and the SST k-ω model are selected for the main gas flow and the secondary flow area of ​​the disk cavity, respectively.

[0020] Step 2: Use the Python language and combine the user-defined function (UDF) of the commercial software Fluent to develop a partition coupling simulation platform. The call of Fluent, the data exchange of the coupling interface, and the judgment...

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Abstract

The invention discloses a direct-partitioning coupling calculation method. According to the coupling calculation method, the inner complex flowing simulation of turbine parts in an aircraft engine or a gas turbine is directly divided into simulation of a fuel gas main flow area and a disk cavity secondary flow area, the two areas use different turbulence models, the turbulence models are respectively applicable to the two areas, and data is exchanged by virtue of a partition coupling interface. Compared with a method of using a single turbulence model, the coupling calculation method is capable of improving the coupling simulation result precision, improving the engineering design process of the existing turbine part and shortening the design period.

Description

technical field [0001] The invention relates to the fields of computational fluid dynamics and numerical simulation of turbulent flow, in particular to a numerical calculation method for the coupling problem of gas main flow and disc cavity secondary flow of a turbine part in an aeroengine or a gas turbine. Background technique [0002] Aeroengines and gas turbines are important industrial equipment, and their core machines include high-pressure compressors, combustors and high-pressure turbines. Such as figure 1 As shown, the single-stage high-pressure turbine is composed of two rows of blades: the stationary guide vane 3 and the rotating rotor blade 4. The high-temperature and high-pressure gas at the outlet of the combustion chamber is guided by the guide vane 3 and impacts the rotor blade 4 to rotate at a suitable angle to perform work. It constitutes the main channel 1 of the gas. The structure supporting the guide vane 3 and the moving blade 4 is called the stator di...

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Application Information

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IPC IPC(8): G06F17/50
Inventor 叶建于霄陆海鹰
Owner CHONGQING UNIV