首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   5篇
  免费   0篇
教育   5篇
  2010年   2篇
  2009年   1篇
  2002年   1篇
  2001年   1篇
排序方式: 共有5条查询结果,搜索用时 0 毫秒
1
1.
天津市区机动车实际道路行驶特征的研究   总被引:1,自引:0,他引:1  
利用自行设计的机动车车载实时道路排放测试系统 ,通过实际道路测试 ,获得描述天津市不同类型道路机动车行驶的 15个特征参数 .结果表明 ,ECE 15和FTP 75测试循环与天津市机动车实际道路行驶特征有较大差异 .根据实测结果 ,合成出可真实反映天津市机动车道路行驶特征的测试循环 ,该测试循环可用于实验室中对机动车实际道路排放水平的评价 .  相似文献   
2.
The flame structure of gasoline engine is complicated and has the characteristic of fractal geometry. A fractal combustion model was used to simulate the engine working cycle. Based on this model, the fractal dimension and laminar flame surface area of turbulent premixed flames were studied under different working conditions. The experimental system mainly includes an optical engine and a set of photography equipment used to shoot the images of turbulent flame of spark-ignition engine. The difference box-counting method was used to process 2D combustion images. In contrast to the experimental results, the computational results show that the fractal combustion model is an effective method of simulating the engine combustion process. The study provides a better understanding for flame structure and its propagation.  相似文献   
3.
本文介绍了作者创新车辆发动机原理课程体系、更新教学内容与改革实验教学相结合,深入生产实际和学科前缘找课题,开展研究性教学的方法与效果.  相似文献   
4.
Dependent on automatically generated unstructured grids, a comprehensive computational fluid dynamics(CFD)numerical simulation is performed to analyze the influence of nozzle geometry on the internal flow characteristics of a multi-hole diesel injector with the multi-phase flow model based on Eulerian multi-fluid method.The diesel components in nozzle are considered as two continuous phases, diesel liquid and diesel vapor respectively.Considering that both of them are fully coupled and interpenetrated, sepa...  相似文献   
5.
旋流喷嘴射流宏观及微观特性实验研究   总被引:2,自引:0,他引:2  
对旋流喷嘴射流的宏观和微观特性 ,如表面波的发展、射流破碎过程、喷雾锥角、破碎长度等进行了实验研究 ,考察了喷嘴结构、喷射条件、射流介质的物性等对空心旋转液体射流特性的影响 .揭示了旋流喷嘴的射流特性 ,有助于旋流喷嘴的设计、应用及改进  相似文献   
1
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号