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模拟了一种常规快速式燃气热水器的燃烧系统,研究了不同压力状况下的燃烧工况.得到的数值模拟结果与实验获得的数据吻合得较好,证明了所用物理模型和数学模型的合理性.结果显示,火焰高度和过剩空气系数依赖于系统出口和入口的静压差,而与燃烧室内的绝对压力无关.该静压差和系统中用于燃烧的空气量显著影响CO的生成,与CO的生成量呈反比关系,并同时影响燃烧区域内的温度场和速度场.为降低CO排放水平,必须增加进入燃烧系统的空气量,因此需要增加风机输出功率以提供足够的空气压头.该研究为设计快速式燃气热水器提供了一种行之有效的方法.
The combustion system of a conventional fast gas water heater is simulated and the combustion conditions under different pressure conditions are studied.The numerical simulation results obtained are in good agreement with the experimental data and the rationality of the physical model and the mathematical model The results show that the flame height and excess air coefficient depend on the static pressure difference at the system outlet and inlet independent of the absolute pressure in the combustion chamber.The hydrostatic pressure and the amount of air used for combustion in the system significantly affect the generation of CO and CO production is inversely proportional to both the temperature field and the velocity field in the combustion zone.In order to reduce the CO emission level, the amount of air entering the combustion system must be increased, so the fan output power needs to be increased to provide a sufficient air pressure head. The study provides a proven method of designing fast gas water heaters.