Session: 04-25 Atomization and Spray Combustion I

Paper Number: 125240

125240 - Effect of Cracking Pressure and Flow Split Ratio on the Atomization Performance of Dual-Orifice Injectors 

In gas turbine engines, pressure-swirl atomizers function in tandem with integrated valves, leading to performance in dual operation modes that markedly differs from scenarios where the injector operates independently. This can result in a deterioration of atomization quality when the secondary fuel line operates at a sub-optimal pressure, particularly during its initial activation. This study explores spray characteristics such as angular and radial non-uniformity, cone angle, combined flow number, and instability for a representative engine configuration across various cracking pressures. The aim was to identify the flow split ratio corresponding to the weakest atomization performance. The findings indicate that when the secondary line engages at higher cracking pressures, the negative impact on atomization is less pronounced, with this deterioration occurring later. Conversely, at lower activation pressures, a higher spray angle can be achieved. Dynamic characteristics were also investigated using a high-speed imaging technique for different cracking pressures to further comprehend the effect of the flow split ratio on part-load operations, using spray-angle fluctuations as a measure to assess spray instability. It was observed that the nozzle's flow number ratio dictates the most unstable operation point, with amplitudes diminishing as the critical flow number ratio is surpassed. Dynamic behavior of the dual-orifice nozzle could play a significant role in combustion instability and should be carefully considered during the design process.

Presenting Author: Hıdır Yankı Kılıçgedik Tusaş Engine Industries

Presenting Author Biography: With an 8-year track record in aerodynamics and combustion engineering, he has distinguished himself, particularly in the intricate arena of fuel injector design, analysis, and testing. He played an instrumental role in the development and iterative enhancement of turbofan engine injectors, crucially impacting the Turkish aviation industry. His holistic approach to combustion, underpinned by his extensive experience in aerodynamics, positions him as a trusted expert in the field. Over the years, he has seamlessly integrated theory with hands-on practice, driving innovations and ensuring optimal performance in real-world scenarios.

Authors:

Hıdır Yankı Kılıçgedik Tusaş Engine Industries
Refik Alper Tuncer Tusaş Engine Industries