Impact of geometry on spray combustion in an enclosure

摘要

The objective of this work was to study an effect of the combustion chamber geometry/length on characteristics of a spray flame such as its shape, height, and structure along with the flow field parameters. The study was aimed at assisting andoptimizing the design process of the combustion chamber. Chemically reactive computational fluid dynamics (CFD) modeling was applied to predicting the impact of geometry, as a tool for these studies. The CFD computer code used to predict the industrialspray combustion process, was originally developed for the aerospace engineering applications. The code numerical method utilizes, among others, unique third order of accuracy spatial approximations, a second order of accuracy temporal approximation, andthe pressure implicit with splitting of operators (PISO) approach, which makes the solution convergent and exceptionally stable and efficient. A series of numerical tests was performed to identify the most efficient numerical procedure out of a suite ofnumerical approaches. Based on the spray combustion predictions, it has been found that the chamber length/height has a significant impact on the flame penetration/length, and some influence on the spray structure in the initial section, due to theaerodynamic suction effect of the chamber exhaust.