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| 1 | A Study on Aerodynamic Performance of Diff erent Bionic-Structured Surfaces via Belt Grinding显示文摘The structural characteristics of the surfaces of sharkskin have great influence on their aerodynamic performance.It has been proved that the sharkskin’s ribbed structure can improve the aerodynamic performance of the parts up to 10%.At present,the main processing methods for this structure are laser,rolling,etc.,which have low efficiency and poor surface integrity.Belt grinding is widely used in the surface grinding and polishing.It plays an important role in improving the surface integrity and can realize the micro-structure machining at the same time.To achieve drag reduction,based on the characteristics of drag reduction of Bionic-Ribbed Structures(BRS),diff erent BRS(V,trapezoid and wave)on a blade were processed and studied.First,this paper introduces the theory of drag reduction induced by BRS and processing methods of diff erent BRS on a blade by belt grinding,and carried out the verification of the belt-grinding methods.Then,diff erent BRS models were established on the blade with diff erent tip angles,and the aerodynamic performance was analyzed through simulation.It was found that the low-velocity layer near the BRS decreased when tip angle increased.Its wall shear stress also increased and tip angle of 45o had the best performance regardless of which BRS was.Some suggestions were given for belt grinding.The velocity along height from valley of BRS and velocity streamline was demonstrated.Secondary vortex was observed.Velocity gradient and vortex were the main reasons for the diff erence of wall shear stress. | Guijian Xiao Yi He Kun Zhou Shengwang Zhu Shayu Song Kangkang Song | 2021 | Journal of Bionic Engineering2021，18，5： | 0 |
| 2 | 特殊浸润性材料在防治油气管道中水合物成核与聚集的应用显示文摘天然气水合物是一种绿色化石能源,但是在石油和天然气开采、管道运输过程中,管道内形成的水合物会聚集堵塞管道,对油气管道安全储运带来严峻挑战。首先,本文结合国内外关于防治水合物成核与聚集的实验和分子模拟研究成果,介绍了不同运输体系中天然气水合物成核、聚集过程以及影响因素,回顾了传统防治天然气水合物成核与聚集方法及其利弊。其次,阐述了特殊浸润性材料基本概念以及在油气相关领域的应用,并着重梳理了其在抑制天然气水合物成核与防止天然气水合物黏附聚集管壁等方面的研究进展。分析了不同运输体系中特殊浸润性材料在应对天然气水合物成核与聚集应用过程中存在的挑战,并对其提出针对性解决设想。最后,对特殊浸润性材料应对水合物成核与聚集领域的未来发展趋势进行了展望。 | 尹新宇 皮丕辉 文秀芳 钱宇 | 2023 | 化工进展2023，42，8： | 0 |
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