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NEW MULTIOBJECTIVE SIMULATED ANNEALING ALGORITHM AND ITS APPLICATION TO turbine cascadeS’ DESIGN

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Chinese Journal of Mechanical Engineering 1999年第1期12卷 51-56页

作者： Tong Tong Feng Zhenping Xi’an Jiaotong University Xi'an Jiaotong Univ Xi'an China

A new kind of multiobjective simulated annealing algorithm is proposed,in which the concept of non dominated character is introduced and a new multiobjective acceptance criterion is set *** optimization example of a typical mathematical problem with two minimum objective functions indicates that all of the solutions contract to the set of the non dominated points,and the variation trend of the optimal solutions is verified to be identical with that obtained using Genetic Algor *** new developed algorithm is then applied to the multiobjective optimization design of turbine cascades,in which it is coupled with the aerodynamics computation of the cascade flow fields and performance and the calculated loss coefficient and work potential of the cascade are considered as the objective functions,thus setting up a technique to the engineering optimization design for the *** optimization results,by the view of a group of optimal solutions,show that the algorithm is superior to the traditional technique of multiobjective optimization design and can be applied to more than two objective optimization cascade design problem or other engineering multiobjective optimization designs.

关键词： Simulated annealing algorithm Multiobjective Optimization design turbine cascade

Investigation of the Aerodynamic Character in turbine cascades with Aft-loaded Profile

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Journal of Harbin Institute of Technology(New Series) 2004年第2期11卷 196-200页

作者：周逊韩万金 School of Energy Science and Engineering Harbin Institute of Technology Harbin 150001 China School of Energy Science and Engineering Harbin Institute of Technology Harbin 150001 Chinaor evaluate the aerodynamic character of the turbine cascades which have the aft-loaded profile the experimental investigation was carried out on the low speed annular wind tunnel. And the detailed measurements of the aerodynamic parameters were made from upstream to downstream of the two type turbine cascades the one is the conventional straight blades cascade the other is the curved blades cascades. The static pressure distributions on the endwall and the blade surface were also carried out. The influence of the aft-loaded profile and the curved blade on the development of loss and the pressure distribution was discussed and analyses the different flow phenomena and mechanism in two type turbine cascades.

For evaluate the aerodynamic character of the turbine cascades which have the aft-loaded profile, the experimental investigation was carried out on the low speed annular wind tunnel. And the detailed measurements of the aerodynamic parameters were made from upstream to downstream of the two type turbine cascades, the one is the conventional straight blades cascade, the other is the curved blades cascades. The static pressure distributions on the endwall and the blade surface were also carried out. The influence of the aft-loaded profile and the curved blade on the development of loss and the pressure distribution was discussed, and analyses the different flow phenomena and mechanism in two type turbine cascades.

关键词： aft-loaded profile turbine cascade aerodynamic character

Experimental Studies on The Mechanism and Control of Secondary Flow Losses in turbine cascades

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Journal of Thermal Science 1992年第3期1卷 149-159页

作者： Wang Zhongqi Han Wanjin Xu Wenyuan Harbin Institute of Technology Harbin Institute of Technology China

This paper summarizes the results of the authors' 4 year experimental studies on the secondary flow losses in turbine cascades. cascade wind tunnel experiments were carried out concerning the influence of aspect ratios, incidence, turning angles and outer endwall divergent angles in order to unveil the evolution mechanism of secondary flow losses in turbine cascades without end clearance. Some methods for controlling the secondary flows are investigated including the blade leaning, blade cambering, endwall convergence and leading edge extension at two ends of the blade.

关键词： turbine cascade secondary flow flow losses flow control.

A Study of 2D Separated cascade Flow at Large Angles of Attack Using Euler Equations

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Journal of Thermal Science 1992年第2期1卷 90-97页

作者： YeDajun LiuWeidong 等 DepartmentofThermalEngineering TsinghuaUniversityBeijing100084China DepartmentofThermalEngineering

This paper presents a numerical simulation method developed for separated flow in cascades using the Euler equations and demonstrates the feasibility of this ***'s two-steps explicit finite difference scheme is used to discretize the equations in conservation form,and the artificial viscosity is added to the dis- cretized inviscid equations by means of the self-adapted filter *** initial separation boundary is given according to simple experimental *** numerical simulation results including subsonic and transonic turbine cascades flow with or without separation show that the fundamental idea of this numerical method is reasonable and *** present study indicates that for solving certain engineering problems it is a simple and effective tool for adding some viscosity corrections to inviscid flow model,especially the current when the Navier-Stokes equations have not been solved very effectively for various complicated flows in turbomachinery.

关键词： separated flow Euler equations artificial viscosity initial separation boundary turbine cascade numerical simulation self-adapted filter technique

Topology Method for Analyses of 3-D Viscous Flow Structure in Transonic Turbomachinery

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Journal of Thermal Science 1997年第4期6卷 273-278页

作者： YanhuGuo BaoguoWang 等 Dept.Eng.Mech. TsinghuaUniversityBeijing100084China Dept.Eng.Mech. TsinghuaUniversityBeijing100084

A topology method is presented in this paper to reveal flow structure occurring inside turbomachinery,in which near wall now structure is revealed by using wall limiting streamlines and space flow feature is revealed by using space streamlines and cross-section streamlines. As an example, a computational three-dimensional viscous flow field inside a transonic turbine cascade is studied. Through the analysis,the form and evolution of vortex system and the whole process of separation occurring within this cascade are revealed. The application of topology method for analyze fiow structure inside turbomachinery is very important for understanding flow features and mechanism of flow loss even for improving the design of turbomachinery and increasing its efficiency.

关键词： transonic flow topological structure turbine cascade numerical simulation