Mixing of Jet Air with a Fuel-Rich, Reacting Crossflow

The mixing of jet air into hot, fuel-rich products of a gas-turbine primary zone is a critical step in staged combustion. Often referred to as quick quench, the mixing occurs instead with chemical conversion and substantial heat release. An experiment has been designed to simulate and study this process. The geometry is a crossflow confined in a cylindrical duct with a sidewall injection of jets issuing from round holes. A specially designed reactor, operating on propane, presents a uniform mixture to a module containing jet air-injection orifices that can be varied in geometry. Temperature and species concentrations of O2, CO2, CO, and HC are obtained upstream, downstream, and within orifice planes. From this information, the penetration of the jet, the spatial extent of the chemical reaction, and the mixing can be deduced. Results are presented for a mixing module containing 10 round holes that is operated at a momentum-flux ratio of 57 and a jet-to-mainstream mass-flow ratio of 2.5. (Author)