In this research, we explored the application of ‘thermal swing’ thermal barrier coatings (TBCs) in diesel engines, aiming to surpass the performance of conventional TBCs. Traditional TBCs often suffer from limitations like consistently high surface temperatures and a delayed response to sudden variations in cylinder temperatures, which adversely impact engine efficiency. To overcome these challenges, plasma electrolytic oxidation (PEO) technology was employed to engineer TBCs with the sought-after ‘thermal swing’ feature. Comparative simulations were conducted to assess the thermal characteristics of PEO coatings on pistons, in contrast to standard LaZrO coatings. The steady-state thermal analysis revealed that PEO coatings maintained a lower peak temperature compared to LaZrO coatings under similar thermal insulation conditions, indicating a superior ability of the PEO coatings in heat dissipation and in sustaining lower surface temperatures.

中文翻译：

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基于PEO和La2Zr2O7热障涂层的柴油机活塞隔热性能模拟分析

在这项研究中，我们探索了“热摆动”热障涂层（TBC）在柴油发动机中的应用，旨在超越传统TBC的性能。传统的 TBC 经常受到诸如持续较高的表面温度和对气缸温度突然变化的延迟响应等限制，这会对发动机效率产生不利影响。为了克服这些挑战，采用等离子体电解氧化 (PEO) 技术来设计具有广受欢迎的“热摆动”功能的 TBC。进行对比模拟以评估活塞上 PEO 涂层与标准 LaZrO 涂层的热特性。稳态热分析表明，在相似的隔热条件下，PEO涂层比LaZrO涂层保持了更低的峰值温度，表明PEO涂层具有优异的散热能力和维持较低表面温度的能力。