Title: Energy/power efficiency and parametric optimisation of a non-afterburning turbojet engine

Authors: Hakan Aygun; Onder Turan

Addresses: Faculty of Aeronautics and Astronautics, Eskisehir Technical University, Eskisehir, 26470, Turkey ' Faculty of Aeronautics and Astronautics, Eskisehir Technical University, Eskisehir, 26470, Turkey

Abstract: In this study, the fluid power values per unit mass flow in a turbojet engine were calculated under different design criteria at on-design phase. Emphasis is placed on understanding and applying the effect of compressor pressure ratio (π_c) and turbine inlet temperature (TIT) on the fluid specific total power (TP_s), specific wasted power (WP_s), specific thrust power (τP_s), specific fuel consumption and overall efficiency. Also, these design parameters (π_c and TIT) are optimised with genetic algorithm for better system efficiency. The analysis results obtained via on-design method are quantified for 3 ≤ π_c ≤ 10, 1,000 K ≤ TIT ≤ 1,400 K. According to the results of optimisation for minimum specific fuel consumption, optimum values of WP_s and τP_s are found 156.384 kJ/kg and 133.953 kJ/kg, respectively. Optimum propulsive, thermal and overall efficiencies which are performance parameters are determined 48.5%, 37.04% and 17.96% respectively.

Keywords: turbojet; thrust power; overall efficiency; optimisation; wasted power; turbine temperature.

DOI: 10.1504/IJSA.2020.108091

International Journal of Sustainable Aviation, 2020 Vol.6 No.1, pp.1 - 20

Received: 31 Dec 2018
Accepted: 23 Jan 2020
Published online: 02 Jul 2020 *

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