Iranian Journal of Mechanical Engineering Transactions of the ISME

Iranian Journal of Mechanical Engineering Transactions of the ISME

Analysing Jet Trainer Engine Performance During Steady-State and Transient Process Under Varying Humidity Conditions

Articles in Press

Document Type : Research Paper

Authors
Mehdi Jahromi 1
Esam Mohammad 2
Jamasb Pirkandi 3
Mostafa Khazaee 2
Mostafa Mahmoodi 2
1 Faculty of Aerospace, Malek Ashtar University of Technology, Iran.
2 Faculty of Aerospace, Malek Ashtar University of Technology, Iran
3 Faculty of Aerospace Engineering, Malek Ashtar University of Technology, Tehran, Iran
10.30506/jmee.2024.2028914.1347
Abstract
This research investigated how atmospheric humidity affects both steady-state and transient performance metrics of a trainer single-spool turbojet engine. Using the inter-component volume (ICV) method, a detailed thermodynamic model was developed and simulations were conducted in MATLAB/Simulink. The study considered modifications to gas properties due to water vapor content. Notably, compressor fouling exacerbates performance degradation, especially when combined with varying ambient humidity levels. Findings indicate that without fouling, peak humidity has minimal impact (within 1% variation). However, fouling at zero relative moisture reduces thrust by 3.48% and increases specific fuel consumption by 1.64%. Under saturated humid conditions (100% relative humidity), thrust can decrease by up to 7%, and fuel consumption rises by approximately 5%. Additionally, transient response times suffer due to both fouling and increased humidity.
Keywords
Humidity
Steady State
Transient
Turbojet Engine
Fouling
Iranian Journal of Mechanical Engineering Transactions of the ISME

Articles in Press, Accepted Manuscript
Available Online from 01 September 2025