Numerické modelování kontrakce a expanze proudu spalin na vstupu a výstupu trubkového chladiče plynu

Abstract

POLÁŠEK, V. Numerical modeling of contraction and expansion of the gas stream at the inlet and outlet tubular of the gas cooler. Ostrava: VŠB - Technical University of Ostrava, Faculty of Mechanical Engineering, Department of Hydromechanics and Hydraulic Equipment, 2014, 56 p. Thesis, head: Bojko, M.

This Thesis is concerned with numerical modelling of contraction and expansion of the gas stream at the inlet and outlet of tubular gas cooler. Numerical modelling was realized in ANSYS FLUENT software. At the beginning, the terms function of heat exchangers and their distribution have been explained. The following terms are pressure drop in heat exchangers and their determination, Fanning factor and coefficient of contraction and expansion. Based on the information about these parameters, 2D models of tubes exchanger with certain variants of the networks have been designed and have been tested for variety mathematical models, types of wall functions. Furthermore the size of the pressure loss has been determined as well as Fanning friction factor and the coefficients of contraction and expansion. Based on the knowledge obtained from 2D modelling the network and mathematical model for 3D model of tubular gas cooler has been designed. Three 3D tube models have been created for numerical simulation. The results of simulations have been evaluated using tables and graphical relationships. In the end, all numerical flow models have been compared.