<p dir="ltr">This thesis presents a comprehensive analysis of liquid injection through plain-orifice injectors into high-speed gaseous crossflows. Experimental data is collected for more than 1,000 injection events into a blowdown wind tunnel with Mach numbers ranging from 0.3 to 2.5, and sophisticated methodologies are developed and employed to quantify spray penetration and jet breakup behaviors. Despite the simplicity of a plain-orifice injector design, the flow field induced by the transverse streams is complex and three-dimensional, and the rapid jet breakup and high advection speeds of the resulting droplet cloud make for a difficult diagnostic environment. This results in a present need for accurate tools to predict the performance of plain-orifice injectors in high-speed crossflows and for specific details of jet breakup behaviors and of the resulting droplet distributions. The experiments conducted for this work constitute a substantial database of high-speed images and flow diagnostics, and the analyses conducted thereof provide critical new understandings of this class of flows. Transmittance images have been used extensively to characterize spray penetration profiles, but new analyses presented here use transmittance to quantify time-averaged droplet distributions and their variations with various flow properties. A novel combination of these with cross-sectional Mie-scatter images also enables the generation of three-dimensional spray profiles. A previously unidentified jet-in-crossflow breakup mode is found and distinguished from the catastrophic breakup mode by its instantaneous spray structures; additionally, both regimes are mapped with respect to momentum flux ratio and Weber number by analyzing peak frequencies in modal decompositions. Finally, a spray penetration correlation is developed that spans both subsonic and supersonic crossflows by applying a novel shock correction. Each of these contributions represents a significant advancement in the scientific understanding of liquid jets in high-speed crossflows and a valuable resource for engine design and model validation.</p>
| Identifer | oai:union.ndltd.org:purdue.edu/oai:figshare.com:article/26343889 |
| Date | 22 July 2024 |
| Creators | Aubrey James McKelvy (11797592) |
| Source Sets | Purdue University |
| Detected Language | English |
| Type | Text, Thesis |
| Rights | CC BY 4.0 |
| Relation | https://figshare.com/articles/thesis/_b_Development_of_a_Unified_Penetration_Correlation_for_Transverse_Injection_in_Transonic_and_Supersonic_Flow_Fields_b_/26343889 |
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