Development of an Optically Accessible Narrow-Channel Detonation Facility for Laser-Based Measurements of Wave Propagation

Pressure-gain combustion systems, such as rotating detonation engines, offer improved thermodynamic performance and reduction in engine size compared to traditional combustion systems as a result of increased post-wave pressures. Improving the efficiency, stability, and control of these propulsion systems requires an in-depth understanding of fundamental detonation behavior. However, detonations prove a challenging environment in which to employ non-intrusive, laser-based diagnostic techniques given their inherent temporal and spatial variability. The current research focuses on the design and validation of the University of Virginia Detonation Facility (UVADet) which will produce a detonation wave with minimal variability while providing improved optical access in order to mature diagnostic techniques not regularly used to study detonations. Preliminary tests to evaluate the performance of the detonation initiator and full facility are reported. High-speed pressure sensors and chemiluminescence are used to measure wave speed and initiator repeatability. Considerations for the future integration of laser-based measurements including one-dimensional coherent anti-Stokes Raman scattering are discussed.