期刊文献+
共找到3篇文章
< 1 >
每页显示 20 50 100
自然风对发机喷流距离的影响 被引量:1
1
作者 陈亚青 刘成 何昕 《科学技术与工程》 北大核心 2021年第32期13986-13991,共6页
为评估起飞点后侧穿越方案的可行性,通过计算流体动力学(computational fluid dynamics,CFD)数值模拟的方法,研究了自然风对起飞飞机发动机喷流距离的影响。发动机喷流除了受自身构型影响之外,自然风影响也不可忽略。首先,构建DES-SA数... 为评估起飞点后侧穿越方案的可行性,通过计算流体动力学(computational fluid dynamics,CFD)数值模拟的方法,研究了自然风对起飞飞机发动机喷流距离的影响。发动机喷流除了受自身构型影响之外,自然风影响也不可忽略。首先,构建DES-SA数值模拟方法,进行标模验证;其次,选取3.5 m/s作为自然风风速值,在静风及自然风条件下,结合典型机型发动机实际边界条件,分别对3种机型发动机喷流效应进行数值模拟,得出其在静风和风(3.5 m/s)条件下的发动机喷流的影响距离。结果表明:相比于静风,3.5 m/s的自然风在远场对喷流距离有较大影响。可见在研究发动机喷流时不可忽略自然风因素。 展开更多
关键词 跑道穿越方式 发动机尾喷 自然风影响 DES-SA方法
下载PDF
某工程超大型冷却塔翅片墙防风措施研究
2
作者 杨嘉 王芳 +1 位作者 刘晓轻 张荣勇 《给水排水》 CSCD 北大核心 2018年第S1期173-175,共3页
针对某工程(百万千瓦级压水堆核电机组),利用FLUENT软件建立自然通风湿式冷却塔的三维分析模型,分析研究了自然风条件下翅片墙对冷却塔热力阻力特性的影响,并对该防护措施进行经济技术分析。当翅片墙的片数为16片时,冷却塔的冷却性能最... 针对某工程(百万千瓦级压水堆核电机组),利用FLUENT软件建立自然通风湿式冷却塔的三维分析模型,分析研究了自然风条件下翅片墙对冷却塔热力阻力特性的影响,并对该防护措施进行经济技术分析。当翅片墙的片数为16片时,冷却塔的冷却性能最好;且当翅片墙长度Lc=18.5m时,防护措施动态和静态投资回收年限均最短。在考虑自然风条件下,安装防风翅片墙能够降低冷却塔的出水温度,其主要原因是由于翅片墙降低了进风口阻力。 展开更多
关键词 超大型海水冷却塔 自然风影响 三维分析模型 翅片墙
下载PDF
Operationalizing Iterative Risk Management under Limited Information:Fiscal and Economic Risks Due to Natural Disasters in Cambodia 被引量:2
3
作者 Junko Mochizuki Soravit Vitoontus +4 位作者 Bandula Wickramarachchi Stefan Hochrainer-Stigler Keith Williges Reinhard Mechler Ros Sovann 《International Journal of Disaster Risk Science》 SCIE CSCD 2015年第4期321-334,共14页
Iterative risk management and risk-sensitive public investment planning are increasingly seen as essential elements of natural disaster resilience. This article assesses the disaster risk facing the hazard-prone South... Iterative risk management and risk-sensitive public investment planning are increasingly seen as essential elements of natural disaster resilience. This article assesses the disaster risk facing the hazard-prone Southeast Asian country of Cambodia and discusses its fiscal preparedness and need for proactive disaster risk management.The study provides a bottom-up assessment of flood and cyclone risks to public and private buildings including educational structures, health facilities, and housing and estimates the total direct economic damage to range from approximately USD 304 million for a 5-year return period event to USD 2.26 billion for a 1000-year return period event. These estimates were further analyzed using the fiscal risk due to disasters, which indicates that Cambodia will likely face a resource gap whenever a hazard as large as that of a 28-year return period event strikes. Given the frequent occurrence of disasters and rapid accumulation of capital assets taking place, proactive risk reduction is highly advisable. But interviews with national policymakers also revealed that there are a number of barriers to effective risk reduction and management in Cambodia. The general lack of awareness regarding risk-based concepts and the limited availability of local risk information necessitate a continued and sustained effort to build iterative risk management in Cambodia. 展开更多
关键词 Cambodia Fiscal impact Iterative risk management Macroeconomic impact Natural disaster risk
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部