科研之友
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摘要
The safety distance of vertical jet fires closely relates to the neighboring land resources utilization and safety, and its value depends on the accuracy of calculating the jet flame thermal radiation range in space. The traditional thermal radiation calculation models of vertical jet fires are broadly divided into the point source model and solid flame model. The former is simple in calculation but low in accuracy, while the latter is totally the opposite. Therefore, in order to simply and accurately calculate the thermal radiation of vertical jet fires, combined with the merits of the above two models, the point source model was innovated to develop a new calculation model based on sub-regions and multi-point sources. Then, a full-size numerical simulation was performed on this newly developed model through the FLUENT, the result of which was compared with those calculated by regularly used one-point and multiple-point source models. The result showed that this model can easily and accurately calculate the thermal radiation range of vertical jet fires with the maximum error of only 6.2%. In conclusion, this new model can not only avoid overestimation of thermal radiation intensity in current criteria (codes) or conservative underestimation of safety distance, but provide a scientific basis for the improvement and innovation of design codes of vertical jet fires.
