A NEW ALGEBRAIC MASS FLUX MODEL FOR SIMULATING TURBULENT MIXING IN SWIRLING FLOW

Abstract

A new algebraic turbulent mass flux model (AFM), which properly accounts for swirl–turbulence interactions, is proposed and formulated in the present article. A simplified explicit form of this new AFM is derived. By incorporating this model with the new algebraic Reynolds stress model proposed previously, a new algebraic stress/flux model (ASM/AFM) is obtained. The new ASM/AFM is applied to the simulation of swirling turbulent flow and mixing in a combustor with helium/air jet and swirling air stream. The calculated gas axial and tangential velocities, gas axial and tangential fluctuating velocities, and helium concentration are in agreement with the measured test data. Comparing with the k–ϵ model for turbulent mass transport, the helium concentration predicted by the new ASM/AFM is much improved.

Acknowledgments

This study is supported jointly by the National Natural Science Foundation of China under Grant 59806006 and the China NKBRSF project, no. 2001CB409600.