Paper Key : IRJ************584
Author: Engr. Dr. Peter C Okoye
Date Published: 02 Oct 2023
Abstract
The study, Determination of propulsive thrust and specific fuel consumption of a turbofan engine system using simulation method was successfully carried out. Researchers achieved the study using simulink in matlab. Simulink in the matlab command window contains gas turbine propulsion block models that were used to model a turbofan engine system to determine propulsive thrust and specific fuel consumption. The initial values of throttle position, Mach number, static pressure and bypass ratio were chosen to be 1, 1.0, 1atm, 0.5 respectively. Initial temperature and pressure were set to 2000k or 2273 and 1 atm respectively. Simulation was allowed to run for 10seconds using Ode23t solver and results, according to the simulation graphs at the stated conditions showed that the propulsive thrust and specific fuel consumption of turbofan engine system were found to be 0.064N and 0.0000252kgs while the thrust specific fuel consumption (TSFC) was 0.00039kgsN. Similarly, the values of throttle position, Mach number, velocity, bypass ratio, final altitude were adjusted to be 30, 0.2, 20 ms, 0.5 and 300m respectively. Results at the stated conditions showed that the propulsive thrust and specific fuel consumption of turbofan engine system were found to be 109N and 0.041kgs while the thrust specific fuel consumption (TSFC) was 0.00038kgsN. In addition, the values of throttle position, Mach number, velocity, bypass ratio, final altitude were further adjusted to be 120, 2.0, 45 ms, 0.5 and 600m respectively. Findings at the stated conditions revealed that the propulsive thrust and specific fuel consumption of turbofan engine system were found to be 164N and 0.06kgs while the thrust specific fuel consumption (TSFC) was 0.00037kgsN. Results suggested that turbofan engine system propulsive thrust and specific fuel consumption are functions of throttle position, mach number, velocity and altitude. Increasing values of the mentioned parameters increases propulsive thrust and specific fuel consumption. Hence, propulsive thrust is a function of specific fuel consumption and optimal value of propulsive thrust that must minimize specific fuel consumption should always be considered in practical designs. Keywords Propulsive thrust, Specific fuel consumption, Block model, Simulink, Turbofan engine