Simulação numérica do trocador de calor recuperador de uma microturbina a gás aplicada à propulsão híbrida

Abstract

This monograph describes a numerical simulation of a Capstone C30 microturbine’s recuperator, located on the bench for testing a hybrid propulsion system for aircraft. This work is part of a more comprehensive study that aims at the energy management of the hybrid propulsion, and for that it is necessary a detailed simulation of the dynamic turbo components, among which is the stove that is the object of study of this work. The geometric and constructive characteristics and the equations that model their behavior were determined, and then a computational code was developed in MATLAB/Simulink® to simulate the recuperator, in order to compose the general simulation of microturbine. Auxiliary codes were developed to determine the physical properties of the gases used as a working fluid in the simulations, depending on the temperatures and pressures. The simulation was validated from data available in the literature and, then, a parametric analysis was performed to study the influence of input variables on the effectiveness and total pressure drop of the fluid flow. Finally, the destruction of exergy in the recuperator was formulated, accounting for the contribution of the heat transfer portion to a finite difference in temperatures and the portion related to the flow pressure drop, results that will serve as a basis for future thermoeconomic analyzes of the bench system as whole.