Experimental investigation on atomization and spray characteristics of impinging-jet injectors

Date

2023-8

Author

Yıldız, Tolga

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The performance and stability characteristics of a liquid rocket engine are strongly affected by the design of the injector. Injectors must be characterized throughout the design parameters to ensure stable and reliable performance over transient and steady conditions. Doublet type impinging-jet injectors have been used in a variety of engine systems over the years. Yet, more investigation on atomization and spray characteristics based on specific design parameters is still needed. This thesis presents a comprehensive investigation into the spray and atomization characteristics of like-doublet impinging-jet injectors through cold flow experiments. The study comprises investigation on a range of parameters, including orifice length to diameter ratio, jet velocity, impingement angle, and impingement distance, which significantly impact injector performance. The experimental methodology involves utilization of a mechanical patternator, a PDA, and high-speed shadowgraphy to obtain both quantitative and qualitative data on certain aspects. Flux distributions, droplet statistics and spray morphologies are examined. Correlations are established for SMD and spray angle values based on jet velocity and impingement angle. The study concludes with determining constants for empirical equations of mass flux distributions. The acquired outcomes are useful for the design and optimization of injectors used in liquid rocket engines.

Subject Keywords

Impinging-injector, Doublet, Spray and atomization, Cold flow experiment, PDA

URI

https://hdl.handle.net/11511/105317

Collections

Graduate School of Natural and Applied Sciences, Thesis