Numerical and experimental investigation of the performance of a high-efficiency domestic gas stove burner using the response surface methodology

The combustion flow field in domestic gas stove burners plays a fundamental role in the structure and shape of the flame, the distribution of the temperature gradient, and, consequently, the thermal efficiency and emission of pollutants. Obtaining a valid numerical model makes it easier to understand this complex flow and its influencing factors. To provide a valid numerical simulation, the thermal efficiency of the burner was experimentally tested in the pressure range of 12 to 24 mbar. The validity of the numerical results was then examined by comparing them with the experimental results. Additionally, the response surface methodology was utilized to investigate the simultaneous and mutual effects of various factors such as gas source pressure, initial temperature of the mixture, and load height on thermal efficiency, burner thermal power, the ratio of radiant heat flux to total flux, and the amount of CO emission. The algorithm proposed 20 cases that were numerically investigated, and the obtained contours were extracted based on the fitted regression models for the output parameters. The results show that although increasing the pressure increases the thermal power of the burner, it decreases its thermal efficiency. As the pressure of natural gas decreases, the flame temperature increases and the temperature peaks approach each other. In fact, the concentration of the flame increases with the decrease in pressure, and as a result, the thermal efficiency increases. Additionally, the results show that CO gas emission decreases with increasing pressure.
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