熏烟模式中熏烟发生距离计算方法探究

A Study on Determining the Distance of Fumigation Occurrence

熏烟发生距离(Xf)的确定是求解熏烟浓度的难点和关键。传统算法忽视Xf非定常性特征,使熏烟浓度计算值与监测值通常有较大偏离,与环评技术导则的要求不符。采用迭代算法和通过计算机编程计算对熏烟发生距离给出准确模拟,探求了熏烟计算过程中纳入非定常性特征的解决方法。对比计算表明新算法符合指数d为0.68,传统算法符合指数d为0.34。

The distance that fumigation start to occur is the key to solve the concentration formed from fumigation.The abnormity of the distance that fumigation start to occur is often ignored when the concentration formed from fumigation is calculated with the routine way,which results in great deviate as comparing monitor value with calculation value,failing to satisfy the requirement of the Guide of Environmental Assessment.A study on determining key variable is conducted by applying iterative arithmetic and with VB programme to the calculation,effectively searching the right solution to bring characteristics of abnormity into the calculation process for concentration formed from fumigation.The contrast shows the index of coincidence is 0.68 for the new way and 0.34 for the routine way.