Abstract
The present study focuses on simulating turbulent flows in a model coaxial combustor with and without swirl at the inlet by linear eddy viscosity model, non-linear eddy viscosity models, and explicit algebraic stress models. The numerical framework of the present predicting procedure is based on the finite volume method, adopting Hybrid and QUICK schemes in convective terms and SIMPLE algorithm to solve the pressure field. There are three test cases considered in the present study. The first two are the coaxial dump combustor with and without swirl at the inlet. The third test case is a strongly swirling flow in a pipe with non-swirling central jet. The computations of non-swirling case indicate that the Craft et al.'s cubic model predicts the best results in terms of the mean and turbulent quantities compared to measurements. However, the Craft et al.'s cubic model did not deliver converging solution in the swirling cases. In the swirling case, which has a forced vortex inlet swirl profile, the explicit algebraic stress models perform better. The predictions of the strongly swirling flow show that explicit algebraic stress model is capable to capture the strong swirl and stress intensity with the swirl level being correctly predicted.