发动机机油滤清器虑层强度分析及优化

针对机油滤清器工作工况下进出口压差、机油滤层强度及导流桩高度等问题, 通过试验测试与仿真相结合, 对滤清器初步设计进行了评估及优化, 以确保滤清器在工作工况下进出口压降及滤层强度能满足要求. 首先进行滤层性能试验, 得到滤层的惯性阻力系数和黏性阻力系数; 再通过滤层多孔介质CFD分析, 对滤清器进出口压降进行分析计算. 结果表明: 在-18℃、25℃和70℃的工况下, 进出口压降都小于10kPa, 满足相关要求. 针对滤层的最大主应力超过其抗拉强度的问题, 通过CAE仿真分析, 优化滤层与导流桩间隙, 将滤层最大主应力由110.1MPa降至36.99MPa, 小于其抗拉强度42.8MPa.     

In Situ Transformation of Prussian-Blue Analogue-Derived Bimetallic Carbide Nanocubes by Water Oxidation: Applications for Energy Storage and Conversion

Using bimetallic Prussian blue analogue (PBA) as a precursor is effective for preparing electrocatalysts for the oxygen evolution reaction (OER); however, the role of these PBA-derived catalysts in the OER is still ambiguous. Herein, by simply controlling synthesis temperature, a bimetallic PBA-derived O,N-codoped Ni–Fe carbide, can be well tuned to optimize structure and OER performance. Importantly, by a series of ex situ and in situ investigations, real active species of NiFeO_xH_y are in situ formed on the surface during the OER, which reveals a “pre-catalyst” role of O,N-codoped Ni–Fe carbides. Furthermore, it has been successfully applied to highly efficient Zn–air batteries and outplays its RuO₂ counterpart. When applied to photoelectrocatalytic water oxidation as the co-catalyst, it improves the performance of the BiVO₄ photoanode by enhancing hole collecting and transporting ability. We believe this research not only provides a highly efficient and low-cost electrocatalyst for the OER, but also unveils the “pre-catalyst” role of PBA-derived materials in energy-storage and conversion devices.     

Host−guest inclusion systems of nicotine with acyclic cucurbit[n]urils for controlled heat releases

Journal of Inclusion Phenomena and Macrocyclic Chemistry - The thermal stability and slow release of nicotine are crucial to its shelf-life and applications. In this article, three kinds of acyclic...     

基于流固耦合的涡轮增压器涡轮机温度场分析

针对某型号涡轮增压器涡轮机零部件温度过高, 存在可能开裂问题, 建立了工作状态下全域流固耦合数值计算模型, 分析了涡轮增压器涡轮机各零部件的温度变化特征, 并与传统模型和实验测试结果进行对比. 结果表明, 全域流固耦合模型避免了传统模型中流体和固体交界面上的大量假设数据输入, 使计算结果更加接近实际情况. 通过和实验测试值对比发现, 全域流固耦合模型得到的涡轮机温度场精度比传统模型得到的结果更合理、准确, 从而验证了全域流固耦合模型的可靠性与准确性.