Abstract
At present, the burning problem of low power burners widely used in emergency and stove heating on the plateau has gradually attracted people’s attention. The fuel injection pressure, inlet air flow, air distribution regulation coefficient, and environmental pressure were considered respectively, and then the four factors and six levels of a uniform experimental investigation were conducted in a low-pressure chamber with adjustable atmospheric pressure. The flame morphology, flame temperature, and NO emission were investigated, and their correlation with each independent variable was analyzed. In addition, burning of droplet swarm was obtained with the simulate numerical calculation by the ANSYS FLUENT. The results showed that the low-pressure environment had a negative correlation with the maximum width and position of flame, the characteristics of flame uplifted and NO emission. Air volume determines the length of the flame, and atmospheric pressure and fuel injection pressure determine the maximum width of the flame. The shape of the horizontal jet flame in plateau environment is more dependent on the regulation of air volume. In order to reduce NO emission in plateau environment, it may be necessary to maintain a large air supply volume and reduce fuel injection pressure appropriately. At the microscopic level of droplet combustion, change mechanisms of macro flame shape in different sub-atmosphere were analyzed. The mechanism of flame morphological change in the plateau environment is the increase in droplet burning time and path. The adjustment of flame under sub-atmospheric pressure through the change of operating parameters is essential to improve the burning rate of droplets.
Highlights
Low power fuel burners are widely used in various chemical heating and heat transfer equipment [1, 2]
E uniform experimental results and correlation analysis were obtained, and the spray combustion at low pressure was explained from the perspective of droplet microstructure
Flame Shape. e ame shape is one of the most important and intuitive characteristics of combustion characteristics [34]. e ame video recorded in the low-pressure chamber was processed with grayscale and binarization [35, 36]. e selection of threshold is the key work of ame binarization
Summary
Low power fuel burners are widely used in various chemical heating and heat transfer equipment [1, 2]. The main change in the plateau environment is the decrease in atmospheric pressure [3]. With the decrease in atmospheric pressure, oxygen content decreases [4], which will lead to the change of chemical reaction mechanism of fuel combustion in such low-pressure and low-oxygen environment, and eventually lead to the change of ame morphology [5], ame temperature [6], and pollutant emission [7]. E in uence of the operating parameters of the burner and the atmospheric pressure changes in the plateau environment on the combustion characteristics of the small diesel burner is complex, especially for di erent atmospheric pressures at di erent altitudes. It was found that when the atmospheric pressure was lower than 0.08 MPa, the highest value of ame temperature was far away from the burner outlet with the decrease in pressure. e standard combustion experiment of liquid fuel was completed through the small size mobile
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
