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首页> 外文期刊>Science and Technology for the Built Environment >Nonuniform three-layer models to predict transient flows in buoyancy-driven natural ventilation with a localized heat source
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Nonuniform three-layer models to predict transient flows in buoyancy-driven natural ventilation with a localized heat source

机译：非均匀的三层模型，以预测瞬态流动的浮力驱动的自然通风，具有局部热源

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摘要

Two classes of nonuniform three-layer models were developed to examine the transient flows driven by a localized heat source. The buoyancy combination coefficient () was proposed, and the buoyancy of the near-ceiling layer was assumed to be a linear combination of the buoyancy of the plume at the ceiling and the buoyancy at the middle layer. The nonuniform models were validated by previous experimental and numerical results to be a universal model and could predict the transient flows more precisely than conventional well-mixed models. Besides, the performance of the modified Model II is superior to Model I. The prediction accuracy increases with the change of , and when , Model II shows the best performance. Compared with thermal stratification height, has a more significant effect on the time evolution of buoyancy. The thermal stratification temperature has a linear variation with the source buoyancy flux, the effective vent area, the floor area, and the enclosure height. With the improvment of prediction accuracy, the temperature difference between the middle layer and the near-ceiling layer becomes smaller, even if there is little effect on the thermal stratification height. Moreover, the enclosure returns to a two-layer space again if the steady state is reached.
机译：开发了两类非均匀三层模型，以检查由局部热源驱动的瞬态流动。提出了浮力组合系数（），并且假设近天下层的浮力是羽流在天花板上的浮力和中间层的浮力的线性组合。通过先前的实验和数值结果验证了非均匀模型，以成为通用模型，并且可以预测瞬态流量比传统的良好混合模型更精确。此外，修改模型II的性能优于模型I.预测精度随着改变而增加，何时，模型II显示了最佳性能。与热分层高度相比，对浮力的时间进化具有更大的影响。热分层温度具有与源浮力通量，有效发泄面积，地板区域和外壳高度的线性变化。随着预测精度的提高，即使对热分层高度几乎没有影响，中间层和近天空间层之间的温差变小。此外，如果达到稳态，机箱再次返回到双层空间。

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