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Numerical simulation of enhancement mechanism of spray combustion by impinging streams |
School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract To explore the key influence factors and influence rules of flow field conditions on the liquid-fuel spray impinging combustion process and discuss the enhancement mechanism of flow field conditions on spray impinging combustion process, the numerical simulation method was used to investigate the spray combustion by impinging streams for the coaxial opposed double-nozzle. The results show that the double-nozzle impinging stream has obvious strengthening effect on the combustion under the same fuel mass flow rate. As the inlet velocity is increased, the fuel evaporation and reaction rates are increased with increased combustion temperature. There is an optimum spacing between the two nozzles to obtain the best combustion results. As the nozzle spacing is increased or decreased, the combustion reaction is weakened. When the nozzle angle is 180°, the best combustion effect can be obtained. As the angle between the nozzles is decreased, the evaporation rate is increased, and the combustion reaction is hindered.
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Received: 13 September 2018
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