Abstract: To optimize the design of the ejector for the atmospheric burner of household gas stoves, a numerical simulation method was adopted to construct the burner flow field model. The influence laws of the throat diameter on the primary air coefficient, the average velocity of the fire outlet hole and the uniformity of mixing under different nozzle diameters were systematically studied. The results show that under different nozzle diameters, both the primary air coefficient and the average velocity of the fire outlet hole show a trend of increasing first and then decreasing with the increase of the throat diameter. For the outer ring burner, both reach the peak simultaneously when the throat diameter is 16.6 mm, and for the inner ring burner, both reach the peak synchronously when the throat diameter is 11 mm. The uniformity of gas mixing gradually improves along the flow direction of the ejector. For the outer ring burner, the standard deviation of CH₄ concentration at the outlet cross-section is the largest when the throat diameter is 16.6 mm, meaning the uniformity of mixing is the worst. For the inner ring burner, the standard deviation of CH₄ concentration at the outlet cross-section is the smallest when the throat diameter is 11 mm, meaning the mixing effect is the best. The research results can provide theoretical guidance for the optimization of ejector structure parameters.

Key words: Gas stove, Numerical simulation, Ejector, Throat diameter, Nozzle diameter