Abstract: The combustion characteristics of a dry low emission high pressure combustion chamber are studied through numerical simulation. Then the model is validated by comparing the simulation result with the experimental data in the literatures. The velocity field, pressure field and temperature distribution at the exit of the combustion chamber under different inlet Reynolds number are analyzed. It is shown from the results that the value of Reynolds number has great impact on the flow field in the combustion chamber. As the Reynolds number increases, the central recirculation zone tends to expand with higher axial velocity at the central recirculation zone . In addition, the temperature at the exit of the combustion chamber rises, where the cross section temperature gradually increases from the external to the center. Besides, as the flow distance increases, the maximum velocity and range of the recirculation zone tend to decrease with the intensity of the reflux lessened and shrinking area of the external recirculation zone.