PROBLEMS OF AERODYNAMICS AND HEAT EXCHANGE IN THE TRANSVERSE FLOW OF SINGLE CONICAL PIPE AT THE TPP SITE

Abstract

Сhimney of thermal power plants are an important element of the complex infrastructure of the TPP industrial site. However, insufficient attention is paid to chimney during calculations. In our country, the majority of chimneys are in an unsatisfactory condition, which leads to negative consequences for the ecological conditions of the environment and affects the operation of thermal power plants as a whole.

The paper presents the results of numerical modeling of aerodynamics and heat exchange on the surface of a conical chimney located at the TPP site. The work uses the traditional RNG k-ε turbulence model for problems of this class. The uniform and height-variable wind speed profile determined by the infrastructure of the environment (different types of terrain) and the industrial site of the TPP are considered. The flow around the chimney has a complex character, with the formation of areas of separation flow and destruction of the boundary layer. It is shown that the location of the pipe relative to the infrastructure objects of the industrial site of the thermal power plant plays an important role in the distribution of velocity, static pressure, and heat exchange along the height of the pipe, which are periodic in height both with a uniform velocity profile and in the area above the engine room building with variable speed profiles of the oncoming air flow. It is shown that the use of the equation of two-dimensional flow around a round cylinder leads to a significant error when calculating the heat transfer on the outer surface of the conical smoke pipe. Such calculation results lead to inaccurate calculations and a reduction in the service life of smoke pipes of thermal power plants and destruction of their surface. Also, incorrect calculations of the heat transfer of the TPP smoke pipe will lead to condensation in its middle and also lead to cracks in the structure of the chimneys.