Simulation Study On Characteristics Of Finned Rear Spoiler In Heat Storage Unit

Fins in the phase change heat storage device plays an important role, in order to understand the role with the fins, heat transfer characteristics, and fin size change impact on the phase transition process, the paper added using the CFD software fluent for heat storage unit with the fins simulated, and study it by analyzing the development of the fins impact on the flow field to study it. The results are as follows:fin effect on the phase change material in addition to providing heat to melt, and the flow field also can impact on the pace of development to influence the phase change material melting faster. Fin height on heat storage unit melts have a greater impact, with the fin height increases its flow field development speed, easy to form a plurality of circulation on fins upper. Fins thickness for the thermal storage unit thawing process was less affected, but as the fins thickness increases its flow field growth rate decreases. Fin spacing on the heat storage unit melts has important implication. If fin spacing is too small, for the heating effect of the fins, intercostals'space weak wall heat source of heat output capacity is severely weakened, reducing the phase change material storage unit, affecting the heat storage capacity of the accumulator. If fin spacing is too large, resulting in an insufficient number of fins, reduce the heat source area. Fin heat storage unit in the early and late heat flux is basically the same, but in the medium term by the flow field, its heat flux reduces bottoms. Finally, this paper gives a brief optimized on fins. Fins before and after optimization, with the storage unit volume in the same circumstances, it is fully melted time from 22s down to 17s, shortened by about 5s. Consequence showed that fins are designed to effectively improve the rate of melting with the storage unit. The liquid-phase region near the fins produces natural convection earlier. In the liquid region, the fins can form an effective natural convection and circulation traction side, to the top of the side walls perpendicular to the flow. The ability of heat transfer was enhanced.