A design procedure for improving the efficiency of a transonic compressor blading was proposed based on a rapid generation method for three-dimensional blade configuration and computational meshes, a three-dimensional...A design procedure for improving the efficiency of a transonic compressor blading was proposed based on a rapid generation method for three-dimensional blade configuration and computational meshes, a three-dimensional Navier-Stokes solver and an optimization approach. The objective of the present paper is to design a transonic compressor blading optimized only by selection of the locations of maximum camber and maximum thickness for the airfoils at different span heights and to study how do these two design parameters affect the blade performance. The blading configuration and the computational meshes can be obtained very rapidly for any given combination of maximum camber and maximum thickness. The computational grid system generated is used for the Navier-Stokes solution to predict adiabatic efficiency, total pressure ratio and flow rate. As a main result of the optimization, adiabatic efficiency was successfully improved.展开更多
In many situations,we are interested in selection of important variables whichare adequate for prediction under a linear regression model.In this paper,a fast selectionprocedure is proposed and is proved to be strongl...In many situations,we are interested in selection of important variables whichare adequate for prediction under a linear regression model.In this paper,a fast selectionprocedure is proposed and is proved to be strongly consistent.Also,the convergence rate ofmisjudgement probability is given.展开更多
北京车展开幕之际,各大新能源汽车品牌正在忙碌于种种统筹活动。然而,就在这热火朝天的时刻,他们却于4月23日齐聚在北京郎园,因为,由《新能源汽车新闻》N.E.S(New Energy Style)举办的'2016首届新能源汽车营销沙龙'在这里举行...北京车展开幕之际,各大新能源汽车品牌正在忙碌于种种统筹活动。然而,就在这热火朝天的时刻,他们却于4月23日齐聚在北京郎园,因为,由《新能源汽车新闻》N.E.S(New Energy Style)举办的'2016首届新能源汽车营销沙龙'在这里举行。众所周知,新能源汽车市场经过一轮'井喷'之后,去年销量达到了33万辆。但是,在国家政策和地方政策大力支持、充电基础设施建设速度逐渐加快的背后,展开更多
文摘A design procedure for improving the efficiency of a transonic compressor blading was proposed based on a rapid generation method for three-dimensional blade configuration and computational meshes, a three-dimensional Navier-Stokes solver and an optimization approach. The objective of the present paper is to design a transonic compressor blading optimized only by selection of the locations of maximum camber and maximum thickness for the airfoils at different span heights and to study how do these two design parameters affect the blade performance. The blading configuration and the computational meshes can be obtained very rapidly for any given combination of maximum camber and maximum thickness. The computational grid system generated is used for the Navier-Stokes solution to predict adiabatic efficiency, total pressure ratio and flow rate. As a main result of the optimization, adiabatic efficiency was successfully improved.
文摘In many situations,we are interested in selection of important variables whichare adequate for prediction under a linear regression model.In this paper,a fast selectionprocedure is proposed and is proved to be strongly consistent.Also,the convergence rate ofmisjudgement probability is given.
文摘北京车展开幕之际,各大新能源汽车品牌正在忙碌于种种统筹活动。然而,就在这热火朝天的时刻,他们却于4月23日齐聚在北京郎园,因为,由《新能源汽车新闻》N.E.S(New Energy Style)举办的'2016首届新能源汽车营销沙龙'在这里举行。众所周知,新能源汽车市场经过一轮'井喷'之后,去年销量达到了33万辆。但是,在国家政策和地方政策大力支持、充电基础设施建设速度逐渐加快的背后,
