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Nox Formation in High Pressure System
Spectrally resolved laser-induced fluorescence (LIF) with one-dimensional spatial imaging can be used to probe trace concentrations of nitric oxide (NO) in high-pressure flames. Premixed methane flames in pressures up to 60bar were investigated and determined that at nominal laser pulse energy of 16 mJ, detection limit of sub-10ppm is possible. Such diagnostics would be ideal for validating capabilities modern combustion-based energy systems.
Imaging Shockwave & Boundary Layer Interaction
Planar laser-induced fluorescence (PLIF) imaging was used to visualizes trans- and supersonic flow fields in a shock tube. Images were taken across incident and reflected shock waves near both side and end walls to study their interaction with boundary layers. Images accurately determined shock-heated gas temperatures up to 1000K and resolve complex flow features quantitatively.
Resolving Spatiotemporal Exhaust Gas Recirculation
A mid-infrared laser coupled to a probe-based diagnostics was used to study exhaust gas recirculation in internal combustion (IC) engine. The custom-design sensor enables fast and spatially-resolved in-situ carbon dioxide (EGR surrogate) measurements in the intake manifold of a near production-ready engine. Crank-angle resolve measurements provide detailed information on cylinder-to-cylinder and cycle-to-cycle variations in real-time. Such information can be used to design more efficient and higher performance engines.