统计Fluent生成的dpm文件信息，可以获取颗粒直径数量百分比　停留时间等信息 方便处理DPM文档生成文本文档统计信息(Fluent DPM Statistics Fluent generated DPM file information, you can get the particle diameter, number, percentage, residence time and other information, easy to handle DPM documents, generate text documents, statistical information)