Numerical and Experimental Investigation of a Non-Premixed Double Swirl Combustor

Abstract

This paper focuses on a detailed numerical investigation combined with experimental research for a non-premixed swirl combustor, which aims to analyze the effects of the blade angle of the outer swirler and equivalence ratio on flow and combustion characteristics. In the experiment, the temperature in the furnace was obtained with a thermocouple, while a realizable k-ε turbulence model and two-step reaction mechanism of methane and air are used in the numerical method. The calculation results are in good agreement with the experimental data. The results reveal that the air flow rate through the swirler accounts for a small amount of the total air due to the influence of the draft fan, and there is no central recirculation zone (CRZ) despite the presence of the swirler. It was also found that NO emissions gradually decrease as the blade angle of the outer swirler increases. It was also indicated that the average temperature is 100 K higher than the general combustor with a 58° blade angle in the furnace by increasing the equivalent ratio of the tertiary air area, and the NO emissions reduced by approximately 25%. This study can provide guidance for the operation and structural design of non-premixed swirl combustors.

Effects of Hydrogen Addition on Premixed Combustion of Kerosene in SI Engine

“…The combustion process inside a high-speed SI engine is very complicated, and dramatic oxidation reactions occur in a short time. Numerical simulation [2] and experimental investigation [3] are often employed to characterize the combustion of various fuels. The working conditions in SI engines differ greatly from those in gas turbines.…”