An Experimental and Numerical Study of Kerosine Spray Evaporation in a Premix Duct for Gas Turbine Combustors at High Pressure

Abstract

The evaporation and mixing of kerosine emerging from a flat prefilming airblast atomizer was studied experimentally and numerically in an optical accessible, straight rectangular duct at conditions relevant for lean premixed and prevaponzed combustion. Liquid phase properties were measured by Phase-Doppler anemometry and fuel vapour concentrations were determined by an infrared light extinction technique. Computations were based on the Lagrangian particle tracking technique, and captured the spray features sufficiently well with and without taking into account the spray feedback on the gas field. A degree of evaporation of 95% was measured after l00mm for 9 bar air pressure, 750K air temperature and 120m/s air velocity. No autoignition of the fuel occurred. Parametric variations of pressure, temperature and velocity of the air flow, as well as of the initial temperature of the spray and of fuel loading were conducted. A strong influence of the initial fuel temperature on evaporation was found. The air pressure had mainly an indirect but strong effect through atomization quality.

Keywords:

• Spray evaporation
• high pressure
• gas turbine combustion chamber
• prefilming airblast atomizer
• premix duct; kerosene

Additional information

Notes on contributors

M. RACHNER

Corresponding author, e-mail: [email protected]