本文运用计算机辅助优化数值试验方法对大型电站锅炉四角切圆炉膛中气体和煤粉颗粒在不同运行工况下的流动特性进行了基础性研究．得到了满负荷运行和变工况缺角运行时炉内空气动力场的变化，并了解了实际切圆直径沿炉膛高度变化及截面上最大切向速度沿炉膛变化的规律．对煤粉颗粒的运动轨迹计算表明，颗粒直径对其运动影响较大．另外，对变工况运行时所引起的煤粉火焰偏转情况进行了分析．部分数值试验的计算结果和实际的现场测试结果吻合较好． In this paper, computer-assisted optimization of numerical test method for large-scale power station boiler tangential hearth gas and pulverized coal particles in different operating conditions under the flow characteristics of a fundamental study. The changes of the aerodynamic field in the furnace under full-load operation and in the chamfering operation were obtained. The laws of the variation of the actual tangent diameter along the furnace height and the maximum tangential velocity along the furnace were obtained. Calculation of the trajectory of pulverized coal particles shows that the particle diameter has a great influence on its movement. In addition, the situation of variable working conditions caused by pulverized coal flame deflection were analyzed. The numerical results of some numerical experiments are in good agreement with the actual field test results.