This presentation highlights the integration of high-speed imagery and profilometer measurements for an analysis of how surface roughness and capillary number influence ignition delay and degassing patterns in hypergolic hybrid rocket propulsion through droplet tests.
High-speed visible spectrum images are employed to measure the time gap between the initial contact of the propellants and their ignition. Additionally, a custom-designed Schlieren imaging system is implemented to monitor the release of gases from the fuel surface before ignition. To capture the propellant's temperature profile in the brief interval between contact and ignition, a high-speed infrared camera is utilized. This comprehensive suite of imaging techniques provides invaluable insights into the ignition process.
Specifically, the study delves into the hypergolic ignition of Ammonia-Borane in a Paraffin Matrix as fuel, accompanied by White Fuming Nitric Acid as the oxidizer.