Impact of Injector Fabrication Technique on the Injection and Atomization of JP-10 for High-Speed Aero-Propulsion Systems
Abstract
Effective liquid fuel injection on future high-speed aero-propulsion systems is a critical requirement for high performance in volume-limited flight vehicles. The use of emerging manufacturing methods can potentially deliver favorable injection properties while allowing for complex design integration flexibility. The injection properties were characterized for conventional and alternative fabrication methods, including additive manufacturing, laser drilling, electric discharge machining, and platelet techniques. ANSYS Volume of Fluids-Discrete Phase Model simulations modeled the injection and atomization of JP-10 into a simulated engine environment, and the results were compared to experimental images for similar conditions. The experimental setup utilized planar laser-induced fluorescence to visualize the central jet cross-sectional trajectory of each injector type. This work added a dynamic lateral translation method for additional measurement planes across multiple jet orifices. Computer simulations to date have overpredicted the jet penetration characteristics when modeled as a single jet, ignoring geometry details such as port roughness. The influence of neighboring jets appears to increase the perceived air flow blockage and reduce the effective local fuel-air momentum ratios as fuel flow rates increase. This observation results in the requirement to model adjacent fuel jets to better capture the jet penetration and atomization trends.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 2021
- Accession Number
- AD1164462
Entities
People
- Brendan R. Philbin
Organizations
- Naval Postgraduate School