Spray response on a model prefilmer under unsteady airflows of various frequencies

An appealing concept for jet engine combustors is the Lean Premixed Prevaporized (LPP) combustor, which operates at high pressures. The low NO x emissions achieved by lean combustion are one of targets modern aircraft engines. However, these types can introduce thermoacoustic instabilities that potentially damage and reduce its lifespan. Since potential on fuel spray characteristics, i.e. mass flux, affect flame stability, need arises to investigate response under an unsteady airflow. For this study, a model prefilmer was experimentally investigated produce two-dimensional droplet flow without swirl flow. acoustic forcing in range 100–500 Hz introduced into airflow, characterized hot wire Constant Temperature Anemometry (CTA) setup. Droplet namely diameter distribution velocity, were determined using Phase Doppler (PDA) setup, while acquired data phase-averaged period airflow oscillation. influence excitation frequency air-to-liquid ratio (ALR) studied: responded therefore critical performance parameters, such as oscillated indicating problems regarding stability.