镇江市主城区排水管网计算机建模方法

为了预防道路积水等城市型水灾害，基于暴雨雨水管理模型（SWMM）平台建立了镇江市主城区排水管网计算机模拟模型。结合建模实践，对排水管网计算机实用建模方法进行了探讨，可分为汇水子区域划分、参数获取、模拟情境设计、灵敏度分析及模型预校准等步骤，为后续的模型微观校准提供了有利条件。该方法对现阶段建模数据不完备地区的排水管网建模具有借鉴意义。     

拖曳线列阵隔振系统参数计算分析

为了研究拖曳线列阵隔振系统参数对隔振效果的影响,利用有限元分析软件ANSYS建立隔振系统的三维流固耦合模型,对隔振系统进行数值模拟,并与实验结果进行对比。分析研究考虑负载的隔振系统材料参数对其隔振性能的影响。参数计算分析为隔振系统隔振性能的研究提供基础,对于提高隔振系统的隔振性能具有一定的参考价值。     

极地海洋环境服役材料的摩擦学研究进展

随着北极航行的发展及极地资源开发的需要，如何提高极地海洋环境服役材料的摩擦学性能愈发重要。在极地海洋环境中，碎冰、冰层和海水中的腐蚀性物质会使材料受到摩擦磨损、腐蚀及其耦合的影响;低温潮湿环境会增加材料的脆性、使材料表面覆冰、改变材料的摩擦磨损机理;强紫外线会加速涂层老化;这些因素都会降低材料的耐磨性能，最终导致材料失效。因此，极地海洋环境服役材料的摩擦学与材料的性能、服役寿命息息相关。本文介绍了极地探索所面临的摩擦磨损问题;阐述了极地温度、极地海洋大气及海水成分、海冰运动和极地微生物等极地海洋环境特点及其对材料摩擦学性能的影响;重点介绍了金属材料、无机非金属材料、高分子材料在极地海洋环境下的摩擦学进展;探讨了提升材料在极地海洋环境下的耐磨防腐技术，如改性、表面修饰等;最后，结合极地海洋环境服役材料摩擦磨损研究中所面临的问题及发展趋势，对未来极地海洋服役材料的摩擦学研究工作进行展望。     

Numerical simulation of hydrogen leakage diffusion in seaport hydrogen refueling station

Ningbo's seaport hydrogen refueling station was used as the research object. The effects of different leakage angles, wind direction, roof shape, leakage hole diameters, temperature, and humidity on the diffusion of hydrogen leakage were studied by numerical simulation. The influence of leakage angle on hydrogen leakage is mainly reflected in the presence or absence of obstacles. The volume of the flammable hydrogen cloud was reduced by 31.16%, and the volume of the hazardous hydrogen cloud was reduced by 63.22% when there was no obstacle. The wind direction can significantly impact hydrogen leakage, with downwind and sidewind accelerating hydrogen discharge and reducing the risk. At the same time, headwind significantly increases the volume of the flammable hydrogen cloud. Compared with no wind, the volume of the flammable hydrogen cloud increased by 71.73% when headwind, but the volume of the hazardous hydrogen cloud decreased by 24.00%. If hydrogen shows signs of accumulation under the roof, the sloping roof can effectively reduce the hydrogen concentration under the roof and accelerate the hydrogen discharge. When the leakage angle θ = 90°, the sloping roof reduced the volume of the flammable hydrogen cloud by 11.74%. The leakage process was similar for different leak hole diameters in the no wind condition. The inverse of the molar fraction of hydrogen on the jet centerline was linearly related to the dimensionless axial distance of the jet in different cases. Using a least squares fit, the decay rate was obtained as 0.0039. In contrast, temperature and humidity have almost no effect on hydrogen diffusion. Hydrogen tends to accumulate on the lower surface of the roof, near the roof pillars and the hydrogen dispenser. In this paper, a set of hydrogen detector layout schemes was developed, and the alarm success rate was verified to be 83.33%.