Experimental and simulation analysis of the performance of premixed vertical ejectors

Abstract

Infrared gas stoves have advantages such as rapid combustion speed and high thermal efficiency. The ejector, a pivotal component of the infrared gas stove, plays a crucial role in influencing the mixing ratio of gas and air. The vertical ejector is modeled and the simulation method is validated through experiments. The impact of structural parameters on the vertical ejector performance is investigated in this paper, like the contraction tube length, inlet diameter, and mixing tube length. The simulation results indicate that with the change in the contraction tube length, the excess air coefficient peaks at approximately 1.16. An increase in mixing tube length leads to a decreasing trend in the excess air coefficient. For ejectors with throat diameters of 9.8 mm, 11.2 mm, and 12.6 mm, their excess air coefficient reaches peak values at diffusion angles of 3.5°, 4.7°, and 5.0°, respectively. Furthermore, Response Surface Methodology is utilized to study the comprehensive influence of structural parameters on ejector performance and obtain the optimal structure. The excess air coefficient is 1.13 with the optimal geometric structure.