On Evaluating Natural Smoke Exhaust System under Surrounding Wind

摘要：

Natural smoke exhaust with natural air make up under surrounding winds using a two-layer zone model was studied. Overall pressure coefficient was proposed to evaluate the significance of wind on natural smoke exhaust. Quasi-steady states under different conditions for natural smoke exhaust were calculated. The results show that when the pressure coefficient is positive, surrounding wind will enhance the performance of smoke exhaust. When the pressure coefficient is negative, surrounding wind will depress, even invalidate the performance of smoke exhaust. The critical invalidating velocity is found proportional to -1/2 power of absolute value of overall pressure coefficient. When operating a natural smoke exhaust ~stem of a building under surrounding wind, the positions of vents and air inlets should be carefully chosen to make the overall pressure coefficient positive, so as to make the wind strengthen the extraction.

关键词： natural smoke exhaust two-layer zone model surrounding wind quasi-steady state overall pressure coefficient

作者: YANG Shujiang XU Zhisheng YI Liang

作者单位: Institute of Disaster Prevention Science and Safety Technology,Central South University,Changsha 410 Institute of Disaster Prevention Science and Safety Technology,Central South University,Changsha 410

会议类型: 国际会议

会议名称: The 2008 International Symposium on Safety Science and Technology(2008年安全科学技术国际会议)

会议地点: 北京

会议语种:英文

页码: 809-813

在线出版日期: 2008-09-24（万方平台首次上网日期，不代表论文的发表时间）