INLS-based smoke flow and distribution during gas explosion in coal mine

Predicting the concentration and distribution of poisonous gas in the mixture after gas explosion in roadway is greatly significant to safety management and staff protection. Using the improved nonlinear least squares method (INLS), the optimized conditions and characteristics, nonlinear fitting are carried out on poisonous gas concentration data and the fitting formula are deduced. Using this formula and the ones in the references, the CO concentration and distribution are analyzed and studied. Utilizing the improved nonlinear least squares method and the fitting formula, the CO concentration and distribution are simulated. The results show that the fitting formula deduced and in the reference have been made on the more desired results in the application of simulation and comparison. It is concluded and proved that the nonlinear least-squares method, the optimization conditions and features and fitting formula are correct in comparison and simulation.