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This paper presents a comparative analysis regarding Performance Prediction at Design and Off-Design Regimes, applied for two distinct constructions of Jet Engines as Propulsion Systems solutions for the IAR 99 Aircraft. Case Study #1 is represented by Turbojet Engine Rolls Royce VIPER MK 632-41 and Case Study #2 is represented by a Mixed Flows Turbofan Engine. The thorough study is based on appropriate Applicable Theory, which is detailed in the bibliographic references and can be accessed. Applicable Theory includes a part dedicated to Engine Parameter Identification, which is necessary to calculate Brayton Diagram and the performances of the jet engines, expressed as Thrust and Specific Fuel Consumption (TSFC). Applicable Theory includes detailed Mathematical Modeling, Developments and Numerical Simulations for Turbojet Engine and Mixed Flows Turbofan Engine. Performance Prediction results from aero-thermo-gas dynamics analysis of the studied engines. The accuracy of the numerical results depends on the assumptions used for mathematical modeling, which in this case have been considered: real gas, adiabatic flow, the variation with static temperature of the specific heat, losses due to pressure drop and friction, the conditions for full expansion in the exhaust nozzle are met such that the engine can generate maximum of Thrust. Results from Numerical Simulations express Performance Prediction for the Turbojet Engine and the Mixed Flows Turbofan Engine, for the Design and Off-Design Regimes. Comparative diagrams illustrating the variation of Thrust and Specific Fuel Consumption (TSFC) with Mach number and altitude, for the studied jet engines, conclude the analysis. As final remark, the Mixed Flows Turbofan Engine represents a better option than the Turbojet Engine, from the standpoint of greater Thrust and lower TSFC
ANDREI et al. (Wed,) studied this question.