检索结果-南通市图书馆

Diagnosis and design improvement of the Internal Flow Field in an Automotive Cooling Fan Based on Boundary Vorticity Dynamics, Part Ⅰ: Blade Profile Scaling and Rotation

引用

Journal of Thermal Science 2022年第6期31卷 2411-2423页

作者： PENG Zhigang OUYANG Hua WU Yadong TIAN Jie School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China Shanghai Brose Electric Motors Company Limited Shanghai 201801China

To optimize the aerodynamic performance of the automobile cooling fan(ACF), the internal flow field of the original fan was numerically simulated. According to the theory of boundary vorticity dynamics(BVD), the distribution laws of the boundary vorticity flux(BVF) on the blade surface and the circumferential vorticity(CV) at the wake plane of the fan were analyzed, and the underlying various negative factors, such as vortex shedding, separated flow and complicated secondary flow, on the fan blade surface and its dynamic source were diagnosed. Combined with the velocity triangle theory, the mathematical relationship between the BVF diagnosis and the geometrical characteristics of the blade profile(hereinafter referred to as profile) is used to guide the design improvement of the blade. The analysis found that at the same speed, the extension and rotation of the profile could match a smaller input torque at the same flow rate and pressure rise, thereby improving the efficiency of the fan. The test results confirmed the above conclusion. The peak efficiency of the improved fan has been increased by 2.3%, and the aerodynamic performance in the low-flow-rate has been improved. The conclusion of the study shows the applicability of the BVD theory in the diagnosis and design improvement of ACF internal flow.

关键词： boundary vorticity flux automotive cooling fan design improvement blade profile

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A hybrid method for product low-end disruptive innovation

引用

Frontiers of Mechanical Engineering 2022年第3期17卷 159-176页

作者： Yu WANG Runhua TAN Qingjin PENG Jianguang SUN Haoyu LI Fei YU School of Mechanical Engineering Hebei University of TechnologyTianjin300401China National Engineering Research Center for Technological Innovation Method and Tool Hebei University of TechnologyTianjin300401China Department of Mechanical Engineering University of ManitobaWinnipegMBR3T 2N2Canada

Product innovation is often a process for improving existing ***-end disruptive innovation(LDI)enables a product to meet the most price-sensitive customers in the low-end *** existing LDI methods are mainly based on unnecessary characteristics of disruptive ***,they cannot easily identify and respond to the LDI design *** study proposes a hybrid method for the product LDI in two levels of the product design based on the summarized definition and essential characteristics of *** areas of the product LDI are determined using a hybrid relational function model to identify the maturity of dominant *** technologies are identified through the technical search and evaluation of the feasible area for innovation to form an initial LDI ***,the product function is optimized using the trimming concept of theory of inventive problem solving based on the characteristics of *** final LDI scheme is formed and evaluated based on the essential characteristics of the product *** feasibility of the proposed method is verified in the design of a new dropping pill machine.

关键词： low-end disruptive innovation product design design improvement theory of inventive problem solving TRIZ trimming

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

High Reliability LM-2F Launch Vehicle for Space Station Mission

引用

Aerospace China 2022年第1期23卷 12-18页

作者： QIN Tong RONG Yi HU Yanchen LI Wenqing Beijing Institute of Astronautical Systems Engineering Beijing 100076 China Academy of Launch Vehicle Technology Beijing 100076

As China’s only manned launch vehicle,the LM-2 F Launch vehicle successfully launched the Shenzhou 12 manned spacecraft into its predetermined orbit on June 12,2021,signifying the successful completion of the first manned launch mission in the construction and key technology test stage of China Space Station(CSS).From the launch of the Shenzhou 11 manned spacecraft on October 12,2016 to the launch of Shenzhou 12 in 2021,over the past five years,the LM-2 F launch vehicle has been continuously improved in terms of product reliability through technological innovation and design improvement,and its flight reliability index has increased from 0.97 to *** on the new launch mission requirements for the construction stage of CSS,this paper introduces the technological innovation and reliability improvement methods of the LM-2 F from the aspects of design improvement,research methods and process *** LM-2 F launch vehicle will make greater contributions in supporting the construction of CSS with higher reliability and perfect launch success rate.

关键词： space station mission high reliability technological innovation design improvement

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：