Research On Combustion Performance Of Adjustable Mechanical Atomizing Nozzle

A flow adjustable nozzle was selected during the research, whose atomizing quality changed very little with flow. Based on atomizing mechanism of liquid fuel and theory of diffusive combustion, a great deal of research had been conducted to find out the relationship between combustibility, supply pressure and spray cone angle, which provided important theoretical support for the designing and application of the nozzle in the integrated stove.First of all, a single light diesel oil droplet was taken as an object of study. The factors affecting light diesel oil combustion were found out through the analysis of research results, including oil supply pressure of nozzle, spray cone angle, etc. In comparison with relative static droplet combustion, particle sizes of droplets and spray cone angle brought little effect on burning rate.It will increase with the nozzle oil supply pressure. Besides, it can be greatly improved when relative motion was existed between droplets and ambient gas. Research showed that oil supply pressure was the critical factor to burning rate.Secondly, Fluent 6.2 was applied to simulate the combustion of a group of light diesel oil droplets in the integrated stove, using RSM turbulence model, pressure-swirl atomizer model, Non-premixed combustion model and radiation model during the numerical investigation. In order to guarantee heat transfer effect, the angle should be 60 degree to 80 degree and oil supply pressure should be 0.9Mpa to 1.2Mpa.Finally, effection of different swirling cone on liquid membrane thickness was got by analyzing the inner flow field of the nozzle. Based on the relationship between liquid membrane thickness and quality of atomization, the whole design process of the nozzle applied to integrated stove was summarized. Besides, software was developed and it was helpful to the coming project application.