By means of flow visualization on the wall surface and three dimensional flow field numerical simulation for the turbine cascade with 3.6% relative tip clearance, characteristics of the wall flow of the turbine cascad...By means of flow visualization on the wall surface and three dimensional flow field numerical simulation for the turbine cascade with 3.6% relative tip clearance, characteristics of the wall flow of the turbine cascade with large tip clearance is analyzed. The flow pattern on the wall surface near the trailing edge is especially discussed in detail by numerical simulation. Results of the experimental and numerical simulation show that the flow near the cascade trailing edge is very complex, and the wall flow patterns near the upper and down trailing edges are clearly different due to the influence of blade tip clearance.展开更多
叶轮机的叶型设计最终将决定叶轮机的性能,进行可视化的叶型设计,有利于有针对性地直接实施叶型局部优化,提高优化效率。本文基于B ez ier理论,利用O penGL作为图形图像的开发工具,开发了一套对叶轮机二维叶型进行可视化设计的软件,经...叶轮机的叶型设计最终将决定叶轮机的性能,进行可视化的叶型设计,有利于有针对性地直接实施叶型局部优化,提高优化效率。本文基于B ez ier理论,利用O penGL作为图形图像的开发工具,开发了一套对叶轮机二维叶型进行可视化设计的软件,经优化设计前后的数值模拟比较,修型后的叶栅总压损失系数明显下降。表明该软件可以直观有效地应用于叶轮机设计。展开更多
The expressions of the governing equations of turbulent flow with contravariant physical velocity components in a general non orthogonal curvilinear coordinate system are derived by means of tensor theory.A numerical ...The expressions of the governing equations of turbulent flow with contravariant physical velocity components in a general non orthogonal curvilinear coordinate system are derived by means of tensor theory.A numerical method and a computer program for turbulent recirculating flow in the general non orthogonal curvilinear coordinate system are developed.Since the velocity and the displacement vectors are decomposed into their contravariant components,the method has the main advantages of its obviousness in physical meanings,easiness in treatment of boundary conditions and the suitability to the numerical calculations of turbulent flow in various complex geometries.The flow fields in some kinds of complex geometries are calculated.展开更多
文摘By means of flow visualization on the wall surface and three dimensional flow field numerical simulation for the turbine cascade with 3.6% relative tip clearance, characteristics of the wall flow of the turbine cascade with large tip clearance is analyzed. The flow pattern on the wall surface near the trailing edge is especially discussed in detail by numerical simulation. Results of the experimental and numerical simulation show that the flow near the cascade trailing edge is very complex, and the wall flow patterns near the upper and down trailing edges are clearly different due to the influence of blade tip clearance.
文摘叶轮机的叶型设计最终将决定叶轮机的性能,进行可视化的叶型设计,有利于有针对性地直接实施叶型局部优化,提高优化效率。本文基于B ez ier理论,利用O penGL作为图形图像的开发工具,开发了一套对叶轮机二维叶型进行可视化设计的软件,经优化设计前后的数值模拟比较,修型后的叶栅总压损失系数明显下降。表明该软件可以直观有效地应用于叶轮机设计。
文摘The expressions of the governing equations of turbulent flow with contravariant physical velocity components in a general non orthogonal curvilinear coordinate system are derived by means of tensor theory.A numerical method and a computer program for turbulent recirculating flow in the general non orthogonal curvilinear coordinate system are developed.Since the velocity and the displacement vectors are decomposed into their contravariant components,the method has the main advantages of its obviousness in physical meanings,easiness in treatment of boundary conditions and the suitability to the numerical calculations of turbulent flow in various complex geometries.The flow fields in some kinds of complex geometries are calculated.
