Contact Deformation of the Pipeline Sealing Unit

Authors

Andrii O. Kostikov, A. Pidhornyi Institute of Mechanical Engineering Problems of NASU (2/10, Pozharskyi St., Kharkiv, 61046, Ukraine), e-mail: kostikov@ipmach.kharkov.ua, ORCID: 0000-0001-6076-1942

Serhii A. Palkov, Joint-Stock Company Turboatom (199, Moskovskyi Ave., Kharkiv, 61037, Ukraine), e-mail: sergpalkov@gmail.com, ORCID: 0000-0002-2215-0689

Abstract

The features of the turbine steam line sealing unit stress-strain state on the basis of the usage of a three-dimensional design model of the construction and contacting surfaces are examined. A mathematical model is formed and this contact problem solving method, based on the application of the finite element method, is proposed. Contact conditions are taken into account with the penalty function method usage. The verification of the model and the software that implements the proposed method is carried out by comparing the calculation results and experimental data obtained on the physical model of the pipeline made from a low-modulus material. The stress-strain state of the sealing unit of a real pipeline in a three-dimensional setting was determined and the most stressed zones in the unit, which require increased attention during the design and operation of pipelines and their connections, were identified. The developed approach and software make it possible to determine the contact pressure for the horizontal joint flanges of highly stressed cylinder bodies of powerful steam turbines, which helps to avoid a large number of expensive experimental studies.

Keywords: turbine, pipeline, flange connection, contact problem, stress-strain state, contact.

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References

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Received 28 August 2020

Published 30 December 2020