1D model for a low NOx ejector-pump like burner

摘要

This work is about a model for the prediction of air entrainment in a full-premix, atmospheric, ejector-pump like gas burner, used for domestic water heating purposes. The model improves current knowledge by including the effects of combustion and buoyancy on the air entrainment mechanism. It predicts the lambda ratio (excess of air in relation to stoichiometry) as a function of ambient conditions, burner geometry, type of hydrocarbon fuel and burner firing rate. A prototype burner with variable geometry was assembled to calibrate and validate the model. The combustion products were analyzed with a CO2 sensor and the lambda ratio was compared with model's predictions, showing good accuracy. A parametric study was done to ascertain the impact of key geometric parameters on burner aeration.