This paper presents a reduced-order MATLAB Simulink model of the fuel control unit of a PT6A turboprop engine for evaluating the transient response of the engine when operated with Jet A-1 and TS-1 aviation turbine fuels. The study focuses on the functional connection between fuel properties and engine-level variables rather than on detailed hydro-mechanical hardware design. The proposed model represents the fuel control unit as a set of equivalent computational blocks, including power-lever command scheduling, gas-generator speed feedback, compressor-discharge pressure correction, minimum and maximum fuel-flow limits, acceleration and deceleration rate limits, a first-order pump and metering-valve lag, and a fuel-property compensation block. The engine is represented by a zero-dimensional thermodynamic model that includes compressor pressure rise, combustor energy balance, free-turbine speed response, gearbox speed reduction, propeller-shaft power, and propeller-shaft efficiency. Jet A-1 and TS-1 are compared through their lower heating values, with Jet A-1 used as the reference fuel and TS-1 considered both without and with lower-heating-value compensation. Simulation results show that the response curves of the two fuels are close because both fuels belong to the kerosene family. However, without compensation, TS-1 produces a lower final shaft power, approximately 558.63 kW compared with 562.30 kW for Jet A-1. When lower-heating-value compensation is applied, the TS-1 fuel-flow command increases slightly and the shaft power, compressor-discharge pressure, and speed responses are restored close to the Jet A-1 baseline. The results indicate that TS-1 can be considered a feasible substitute from an engine-level thermodynamic perspective, provided that fuel quality, fuel-system condition, and the control schedule are verified before operational use.

Le Phan, Duc Dung Nguyen,"Fuel Control Unit Modeling and Fuel-Property Compensation for Jet A-1 and TS-1 Operation in a PT6A Turboprop Engine Using MATLAB Simulink" International Journal of Advanced Multidisciplinary Research and Educational Development, V2(4): Page(367-370) July - August 2026. ISSN: 3107-6513. www.ijamred.com. Published by Scientific and Academic Research Publishing.