Liquid Distributions of a Low Pressure Drop Injection System: Gas Turbine “Vaporizer” Design

Abstract

Low pressure drop fuel injectors for jet engine combustors are currently being considered. In this respect, the general problem considered in this paper is the flow variables affecting the distribution of a low pressure drop, low velocity stream of liquid which is convected by a concentric airstream against a concave hemispherical cap similar to possible fuel injectors designs (Fig. 1). Experimental results from a plexiglass model of the injection system are presented. The experimental results indicate that for a centrally located liquid stream injector (less than 1/16 in. from the true center), the momentum ratio between the liquid and air streams is the predominant factor which influences uniform fuel distributions. More uniform distributions are obtained with higher liquid-to-air momentum ratios. For larger injector eccentricities, the liquid distributions exhibit variable tendencies depending on the range of the momentum ratio.