基于Box-Behnken响应面的煤尘爆炸强度多因子耦合效应的实验研究OA

Using the Box-Behnken experimental design method,the influence of multi-factor coupling effects on the intensity of coal dust explosion during the transient explosion reaction process was studied.Forty-five sets of explosion tests were carried out in a 20L spherical explosion test system,examining the macroscopic characteristics of the coal dust explosion intensity under the coupling effects of five factors:coal dust concentration(ρ),coal dust particle size(D),coal volatile matter(w),ignition energy(E),and ignition delay(td).The explosion process was monitored by measuring pressure changes,and the maximum explosion pressure(response value pmax)and the maximum explosion pressure rise rate(response value(p˙)max)were determined from the pressure-time curve.The Design-Expert software was used to analyze the experimental results to establish a quadratic regression model for response values pmax and(p˙)max,and the models were verified by four different methods.The results show that in the variance analysis,the coefficient of determination R2 for pmax and (p˙)max is 0.977 1 and 0.925 8,respectively,indicating a good fit between the model and experimental data.The single factors with the greatest influence on the maximum explosion pressure(pmax)are ignition energy(E)and ignition delay(td),while the single factors with the greatest influence on the rise rate of the maximum explosion pressure((p˙)max)is coal dust particle size(D)and ignition delay(E).In the quadratic regression model,the significant two-factor interaction affecting pmax are ρD,ρE,ρtd,Dw,wE,wtd,and Etd,wheras the significant two-factor interaction affecting(p˙)maxare ρtd,Dw,Dtd,wtd,and Etd.Among these,ignition delay(td)plays a decisive role in response values pmax and(p˙)max.