基于流固耦合模拟的燃气灶极限热效率优化机制研究OA

By using computational fluid dynamics(CFD)numerical simulation and heat transfer analysis methods,a systematic study is conducted on the mechanism by which the composite energy-absorbing disk enhances the limit thermal efficiency of the gas stove.The results show that increasing the number of layers of the energy-absorbing disk and filling it with aerogel can increase the thermal efficiency to around 78.5%.The structure increases the internal radiation heat resistance,reduces heat loss,and simultaneously raises the surface temperature on the upper part to enhance the radiation heat transfer at the bottom of the pot and reduces the excess air volume to increase the combustion temperature.However,structures with more than three layers tend to reach saturation due to diminishing marginal benefits,and the heat loss becomes dominated by solid heat conduction between stainless steel components.The bridge-type composite energy-absorbing disk,although able to eliminate radiation and direct heat conduction paths,causes a decrease in combustion temperature due to an increase in air volume,resulting in limited improvement in the overall thermal efficiency.Combining the bridge-type composite energy-absorbing disk with the oxygen control scheme can further enhance the thermal efficiency and reduce the air volume,and reducing the air volume can increase the flue gas temperature and the temperature difference between the flue gas and the grate,enhance the temperature of the upper wall of the energy-absorbing disk,and strengthen the radiation heat transfer at the bottom of the pot.