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Algebraic modeling method of circumferential-direction fluctuation stress terms in turbomachine throughflow model

A technology of pulsating stress and modeling methods, applied in CAD numerical modeling, electrical digital data processing, special data processing applications, etc., can solve problems such as not being able to fully meet design needs, not being able to fully reflect flow field changes, etc.

Active Publication Date: 2018-02-09
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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  • Algebraic modeling method of circumferential-direction fluctuation stress terms in turbomachine throughflow model
  • Algebraic modeling method of circumferential-direction fluctuation stress terms in turbomachine throughflow model
  • Algebraic modeling method of circumferential-direction fluctuation stress terms in turbomachine throughflow 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 a circumferential pulsation stress term in an impeller through-flow model, which relates to aerodynamics and the design of compressor blades of an aviation gas turbine engine, and belongs to the field of aerodynamic design analysis of compressor blades of an aviation gas turbine engine . Background technique [0002] Since the birth of modern gas turbine engines in the 1930s, the performance of aeroengines has improved dramatically. After going through four stages of development, the thrust-to-weight ratio of the main engines 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, fuel consumption and noise are reduced, and reliability is greatly improved. Today, as a knowledge-intensive, dual-use high-tech product, the development level of aero-...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/15G06F30/17G06F30/20G06F2111/10
Inventor 金东海桂幸民唐明智
Owner BEIHANG UNIV
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