A Algebraic Modeling Method of Circumferential Fluctuating Stress Term in Turbine Flow Model

A pulsating stress and modeling method technology, applied in CAD numerical modeling, special data processing applications, geometric CAD, etc., can solve problems such as insufficient reflection of flow field changes and insufficient design requirements.

Active Publication Date: 2020-07-07
BEIHANG UNIV
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Problems solved by technology

Therefore, the existing flow model based on the axisymmetric assumption is not enough to fully reflect the flow field changes caused by the application of sweeping technology, etc., and cannot fully meet the design needs

Method used

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  • A Algebraic Modeling Method of Circumferential Fluctuating Stress Term in Turbine Flow Model
  • A Algebraic Modeling Method of Circumferential Fluctuating Stress Term in Turbine Flow Model
  • A Algebraic Modeling Method of Circumferential Fluctuating Stress Term in Turbine Flow Model

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[0221] Example description:

[0222] Based on the flow software developed by our research group, combined with the algebraic modeling method of the circumferential fluctuating stress item in the turbine flow model proposed by the present invention, the influence of circumferential inhomogeneity in the cascade flow field is initially explored. Finally, the feasibility of the present invention is verified by comparative analysis with the results of three-dimensional numerical simulation.

[0223] In view of the dimensionality reduction characteristics of the flow model due to the governing equations, the key techniques and difficulties in modeling the circumferential fluctuating stress item in the turbine flow model can be summarized as follows:

[0224] 1) The relationship between circumferential inhomogeneity and flow parameters in the average flow field

[0225] The calculation of the through-flow model is the average flow field after the circumferential average, which does ...

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Abstract

The invention relates to an algebraic modeling method of circumferential-direction fluctuation stress terms in a turbomachine throughflow model. The method includes: step 1, defining definition of governing equations and the circumferential-direction fluctuation stress terms of the throughflow model, and establishing circumferential-direction average Euler equations of considering the circumferential-direction fluctuation stress terms; step 2, adopting potential flow analysis assumption according to blade channel inlet flow characteristics; step 3, directly assuming a distribution form of flowparameters along a circumferential direction, and establishing the algebraic modeling method of the circumferential-direction fluctuation stress terms in the turbomachine throughflow model; step 4, carrying out mesh generation and flow field solving, and obtaining a three-dimensional numerical-value simulation result and a throughflow calculation result; and step 5, carrying out analysis of influences of circumferential-direction unevenness on blade channel inlet flow. The method can obtain the circumferential-direction pulsation stress terms which are in the throughflow model and induced mainly due to circulation changing, and has certain guiding significance and engineering practical-value for improving prediction precision of the throughflow model for a flow field.

Description

technical field [0001] The invention relates to an algebraic modeling method for the circumferential pulsation stress item in the turbine flow model, which relates to aerodynamics and the design of compressor blades of aviation gas turbine engines, and belongs to the field of aerodynamic design and analysis of blades of aviation gas turbine engines . Background technique [0002] The performance of aeroengines has improved tremendously since the advent of the modern gas turbine engine in the 1930s. After going through four stages of development, the thrust-to-weight ratio of the main engine models in active service in various developed countries has increased from the initial 2 to the current 7-9 (F110, F100, AL31Ф, etc.), and a few have reached 9-11 (such as F119, M88- Ⅲ, AL41Ф). At the same time, the fuel consumption rate and noise are reduced, and the reliability has also been greatly improved. Nowadays, as a high-tech product with intensive knowledge and dual-use mili...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/15G06F30/17G06F30/28G06F111/10
CPCG06F30/15G06F30/17G06F30/20G06F2111/10
Inventor 金东海桂幸民唐明智
Owner BEIHANG UNIV
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