Mathematical simulation of thermal condition of a brush contact device in three-dimensional setting

Journal Title: Проблеми машинобудування - Year 2018, Vol 21, Issue 2

Abstract

A detailed review of the existing design of brush contact devices for 200 MW to 600 MW turbo-generators is performed. The peculiarities of brush contact devices working in tandem with turbo-generators of various firms are considered. The main causes of damage are indicated and the ways of development and improvement of the existing design are indicated. An analysis of the methods of calculating heat releases in a brush contact device caused by heat releases of different nature was performed. The most optimal variant of estimation of the influence of a contact spot and quality of brushes on the value of heat releases is specified. The possibility of performing a three-dimensional computation, using the results of the analytical computation together with the CFD method, is shown. For the first time, a computation was performed and an improved method was developed for determining the thermal state of a brush contact device for high and medium-power turbo-generators. It is shown that the temperature values obtained as a result of simulating the thermal state of a brush contact device in the SolidWorks Flow Simulation environment meet the requirements for newly designed electric machines. As criteria for the convergence of the solution, the following values for volume were chosen: minimum, average, and maximum static pressure, average mass flow rate; average heat flux on the indicated surfaces. The calculation was performed until the convergence criterion was reached and at least three purges of the computation area were executed. The calculated error does not exceed the measuring error, which makes it possible to evaluate the operability of a brush contact device at the design stages, and the values obtained do not exceed the maximum permissible temperatures in accordance with the requirements of the normative and technical documentation.

Authors and Affiliations

O. V. Tretiak

Keywords

Related Articles

Study of the Stressed State Near the Crack That Initiates at the Inclusion Under Longitudinal Shift Wave Influence

Modern elements of building structures and machine parts often contain structural elements or technological defects that can be considered as thin inclusions of high rigidity. Reinforcing elements of composite materials...

Experimental Study of the Effects of a Constant and Variable Electric Fields on the Strength Properties of the Blade Steel Surface Layer

It is known that in wet steam turbines the wet steam flow is electrified when passing through the turbine flow path. In this, the mutual electrification of the condensed moisture flow and flow path surfaces occurs. Until...

Aeroelastic behaviour of the turbine blade row in 3D viscous flow

<p class="a"><span lang="EN-US">This paper presents the results of a numerical analysis of the aeroelastic behaviour of the oscillating blade row of a turbine stage in the 3D flow of viscous gas, taking into account the...

Modeling of partial closure of slots system in perforated isotropic medium reinforced by stringers

On the basis of the methods of the theory of elasticity, a mathematical description of the model of partial closure of a system of slits in a perforated isotropic medium with foreign transverse inclusions is given. Such...

Peculiarities of Identifying a Power-generating Single-shaft GTE Mathematical Model

The processes of designing and developing gas turbine engines (GTE) are based on using mathematical models (MM), reflecting the physical picture of engine operation processes. One of the ways of improving the MM validity...

Download PDF file
  • EP ID EP622069
  • DOI 10.15407/pmach2018.02.019
  • Views 84
  • Downloads 0

How To Cite

O. V. Tretiak (2018). Mathematical simulation of thermal condition of a brush contact device in three-dimensional setting. Проблеми машинобудування, 21(2), 19-24. https://europub.co.uk/articles/-A-622069