Experimental investigations on temperature profile and air entrainment of buoyancy-controlled jet flame from inclined nozzle bounded the wall

Abstract The aim of this study is to experimentally investigate temperature profile and air entrainment of buoyancy-controlled jet flame from inclined nozzle bounded the wall. In these experiments, one square nozzle with dimension of 6 × 6 mm is placed against the wall with 2 m (height) × 1.5 m (width). Methane is used as fuel and controlled by flow meter. 11 k-type thermocouples, which are fixed on the wall, are used to measure the temperature profile. Four different fire heat release rates (2.76 kW, 4.42 kW, 6.62 kW and 8.83 kW) and four nozzle inclined angles (0°, 30°, 60° and 90°) are considered to study the temperature profile of jet flames. It was found that the parameter constant κ for the intermittent region and plume region of the jet flames increases with the increasing of inclined angles. Based on that, a linear correlation between the parameter constant κ and cosine of inclined angles is proposed. It can be deduced that the air entrainment decreases with the increasing of inclined angle. And a developed temperature profile model considering air entrainment of buoyancy-controlled jet flame from the inclined nozzle bounded the wall has been found.