Theoretical and Experimental Study of a Micro Jet Engine Start-Up Behaviour

Abstract

Proper functioning of the start-up process in a micro jet engine is of great importance. This is due to the fact that the combustion chamber of such engine is so small and therefore, there is little time for fuel and air mixture to be present in the chamber. Hence, failed starts or repetitive attempts by the electric starter are very likely due to non-formation of the initial combustion. Also, the performance of the turbine start-up, impressively affects the limited life time of the micro jet engine. In this paper, an experimental study on the injection of compressed air during the start-up of a micro jet engine to improve its performance has been conducted. For this purpose, test components' layout and a monitoring system are designed. The allowable pressure of the air injection has been calculated using both the engine dynamic model and experimental tests. The simulation results have also been compared and validated with the experimental test results. Finally, several tests were conducted to study the injection process of the compressed air form which, several results have been deduced including the reduction of maximum exhaust gas temperature (EGT) during the start-up, reduction of the start-up time interval and service lifetime enhancement. The method proposed in this paper is applicable on any micro jet engine with the similar structural form and starting process.

Turbojet Engine Industrial Min–Max Controller Performance Improvement Using Fuzzy Norms

“…In the literature, only the After formation of the Min-Max control algorithm, many studies have done for performance improvement of this strategy. Control loops gain tuning in single objective [1,13] and multi-objective feature [14,15], additional control modes definition for engine constraints [2,16], emission level reduction [17,18], adding start-up phase modelling and optimization [19,20], multi criteria decision making strategy [21], integrated flight/propulsion control strategy [22,23], real-time simulation test [24,25], and performance optimization of engine and controller from different points of view [15,17] are some of these milestones in Min-Max control strategy improvements. However, in all these studies the final selection strategy between the transient control loops are kept fixed.…”

Control Requirements for Future Gas Turbine-Powered Unmanned Drones: JetQuads

“…Just one of the jet engine models (on the right side of the figure) is expanded, and the three others are masked to keep the figure tidy. The engine control system is also an internal industrial min-max control strategy that regulates fuel flow into the jet engines to satisfy all engine control modes [30][31][32]. This model is able to predict the dynamic behavior of the JQ with any predefined thrust profile.…”

“…The internal control system of the jet engine is an industrial min-max controller to regulate the fuel flow to the combustion chamber in order to follow the required thrust profile precisely. This controller was also discussed and simulated in detail in References [30][31][32]. This strategy is to satisfy all jet engine control modes simultaneously to protect the engine from malfunctions and physical limitations.…”

A Scientometric Methodology Based on Co-Word Analysis in Gas Turbine Maintenance

“…This field of research has a pivotal role in the mechanical and aerospace sectors as it deals with cost, time saving and risk management in powerplants, marine applications, and air transportation. Gas turbine maintenance covers a wide range of various aspects of gas turbine operation including gas turbine monitoring [9], fault detection and identification systems [10], prognostics [11], and system design and control [12][13][14][15][16]. Therefore, scientometrics methods could be applied to manifest the important future research challenges, determine main approaches, and represent an evolutionary trend of the technology over time.…”