中文摘要：

阐述了基于网络模型的建筑物火灾烟流特性预测系统的研究背景，发掘了相关技术中存在的主要问题并作出改进．在原有的烟气流动网络模型基础上，对装有送风机或排风机的开口计算式进行改进，利用拟合出的计算式代替原有的负质量源计算式，实现网络模型装有机械排烟系统时烟流特性的联立求解．对重庆大学自主开发的烟气流动模拟软件进行改进后，可以实现建筑物在机械排烟时的火灾烟流特性模拟．

英文摘要：

The research background of smoke-flow property prediction system in fire building based on the network model was expounded. Then a major problem of concerned technology was found and solved. Based on the original network-model of building fire smoke-flow, the expressions related to opening installing ventilator were amended. The new expressions replaced the original negative-mass expressions, and a solvable algebra equation set was obtained. Fire smoke-flow property was calculated by the algebra equations set. Predicting software developed independently by Chongqing University for fire smoke-flow property of high building was modified. As a result, smoke-flow property in fire building using mechanical smoke extraction can be simulated.