基于SPH方法的纯电动车涉水仿真研究

基于光滑粒子流体力学方法，在AVL PreonLab仿真软件中建立了某纯电动车的涉水仿真模型，并结合涉水试验，研究了涉水工况下车身内外水的流动和分布规律，重点分析了电驱系统减速器呼吸孔和空调系统进风口的涉水性能。通过仿真和试验，改进了电驱系统减速器呼吸孔的设计，确保电驱润滑油不会进水。通过结构优化切断了水流进入空调进风口的流动路径，同时还验证了AVL PreonLab的仿真功能，表明其能够高效地支持车辆水管理的优化设计。     

基于CFD的整车涉水性能仿真预测

发动机气缸进水将直接导致车辆熄火甚至发动机报废,因此避免发动机进气口水入侵是整车涉水性能开发的关注重点.本文采用流体力学的两相流模型和动网格模型建立整车涉水仿真模型.通过实时监测发动机舱水位高度、发动机进气口的水体积分数和进水量来预测整车涉水性能.对标发动机舱内水位高度的实验与仿真结果,验证了此方法可应用于车辆涉水性能...     

车用发动机在涉水条件下的性能研究

搭建发动机涉水试验台架,对1台4行程柴油机进行涉水试验研究,分析柴油机涉水时的性能变化。结果表明,柴油机不同的涉水深度、不同的涉水温度和不同的涉水方式都将引起润滑油温度的变化,从而影响柴油机的动力性和经济性。     

新能源专项验证与策划

据中国汽车工业协会统计数据显示,燃油汽车产销程缓慢增长趋势,甚至月销售出现了超过10%的同比跌幅。但是新能源汽车逆势增长,生产和销售同比增幅均超过50%以上。随着国家对排放要求日益重视,要求燃油汽车新项目满足国家排放标准,同时并执行国家有关企业质量安全的各项法律,法规的要求,新能源汽车开发完全满足国家排放要求,开发新能源汽车符合当代国家发展趋势,为满足各项质量相关要求,新能源汽车开发需要从事各种各样的验证以满足相关要求。     

Applying Public Participation Geographic Information Systems for Coastal Wading Bird Conservation

Coastal estuaries in the northern Gulf of Mexico are important habitat for wading birds, but are threatened by land use and ecological changes. Conservation has been demonstrated to be more effective when stakeholders are included in the decision-making process. Public Participation Geographic Information Systems (PPGIS) facilitates the inclusion of stakeholder preferences in the planning process by allowing a direct spatial comparison with other ecological data. In this study, we used a PPGIS survey of residents of two counties on Alabama’s Gulf Coast to identify wading bird conservation hotspots as identified by local residents. Additionally, we assessed the ability of general public respondents to accurately identify wading bird habitat, determined whether participants associated wading bird habitat with particular land cover types, and examined whether respondents identified areas with high wading bird species richness. We found that respondents could accurately identify suitable wading bird habitat on a map of the study area, but underrepresented riparian forest, which is an important habitat for many wading bird species. Additionally, participants tended to prioritize areas that support higher wading bird species richness. Thus, this study demonstrated how PPGIS can function as an important tool for incorporating both stakeholder management preferences and identifying knowledge gaps.     

基于VOF方法的某SUV车型涉水性能仿真研究

车辆在涉水过程中由于水溅入发动机机舱内部而导致熄火和部件损坏。为了在车辆设计阶段有效地解决该风险,基于流体体积函数法（Volume of Fluid,VOF）追踪气液两相流动界面原理,在STAR-CCM+仿真软件中建立某SUV车型的涉水仿真模型,分析其在不同水位高度下的涉水过程,并对机舱内水的体积分数和飞溅高度进行监测,得出水流从进入机舱到稳定的相应结论,确定车辆涉水过程中的风险区域。在此基础上,对车身前部和发动机机舱内部结构提出了一套优化方案来提高车辆的涉水性能。