It is discovered that the combustion condition of the second stage pc is up to the outlet temperature of the first stage pc and the content of combustible gases in first stage flue also plays positive effect on the ignition of second stage pc . the effects of parameters of two coal - air mixture , wall temperature of first ignition chamber and annular filling air on imfit are studied experimentally in this thesis . in this thesis , the numerical simulations of ignition and combustion of pc in imfit are conducted 本文通过建立数学模型，对感应加热煤粉多级无油点火进行数值模拟，研究了一级煤粉煤粉在点火室内的着火过程和二级点燃过程、煤粉粒径分布对煤粉多级无油点火的影响，研究了一级点火室壁面温度、一级煤粉气流和二级煤粉气流的风粉参数在煤粉多级无油点火过程中的影响规律；根据二级点燃段的流场和温度场分布，研究了环形夹心风推迟二级煤粉着火的机理。
When in experiment , the air was heated by the film heater installed on the above and below surface of channel , adopting various air velocity of flow , test import ' s and export ' s temperature , wall temperature , fluid flux and the drop of pressure , and the other parameter . adopting nu and nu0 to analyze the baffle ' s situation of heat transfer and fluid flow , which baffle was holed various diameters 实验时，通过矩形通道上下壁面敷设的电加热膜加热通道空气，改变空气流速，测试不同工况时的进出口温度、壁面温度、流体流量和压力损失等参数，并采用无量纲努谢尔特准则数nu 、 nu _ 0等分析了设置不同开孔折流板的换热与流动情况。
