Abstract: The algebraic Reynolds stress model (ASM) and the particle stochastic trajectory model are jointly used in this paper.The particle stochastic trajectory model accounts for random fluctuations both in magnitude and direction of the instantaneous gas velocity.The gas-particle turbulent flow under the interactions between swirling and non-swirling jets in a swirl combustor was numerically simulated.The gas axial and tangential velocities, the root mean square of gas axial fluctuating velocity, the particle total axial mass flux, and the particle axial and tangential velocities were obtained.They agreed with the measured data and were obviously improved over the results obtained by using the k-ε model for the gas turbulence.