A Computer Aided Method for the Design of Centrifugal Impellers Using Optimization Techniques PDF Download

Author: Sarim Jawad Al-Zubaidy
Publisher:
ISBN:
Category : Compressors
Languages : en
Pages : 0

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Author: Ying Ma
Publisher:
ISBN:
Category : Compressors
Languages : en
Pages : 414

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Author: Remko Willem Westra
Publisher:
ISBN: 9789036527026
Category :
Languages : en
Pages : 173

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Author:
Publisher:
ISBN:
Category : Mechanical engineering
Languages : en
Pages : 452

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Author:
Publisher:
ISBN:
Category : Mechanical engineering
Languages : en
Pages : 448

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Author: Awatef Hamed
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 166

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Author: Christoph Schemmann
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Turbomachinery plays an important role in many cases of energy generation or conversion. Therefore, turbomachinery is a promising approaching point for optimization in order to increase the efficiency of energy use. In recent years, the use of automated optimization strategies in combination with numerical simulation has become increasingly popular in many fields of engineering. The complex interactions between fluid and solid mechanics encountered in turbomachines on the one hand and the high computational expense needed to calculate the performance on the other hand, have, however, prevented a widespread use of these techniques in this field of engineering. The objective of this work was the development of a strategy for efficient metamodel based optimization of centrifugal compressor impellers. In this context, the main focus is the reduction of the required numerical expense. The central idea followed in this research was the incorporation of preliminary information acquired from low-fidelity computation methods and empirical correlations into the sampling process to identify promising regions of the parameter space. This information was then used to concentrate the numerically expensive high-fidelity computations of the fluid dynamic and structure mechanic performance of the impeller in these regions while still maintaining a good coverage of the whole parameter space. The development of the optimization strategy can be divided into three main tasks. Firstly, the available preliminary information had to be researched and rated. This research identified loss models based on one dimensional flow physics and empirical correlations as the best suited method to predict the aerodynamic performance. The loss models were calibrated using available performance data to obtain a high prediction quality. As no sufficiently exact models for the prediction of the mechanical loading of the impellercould be identified, a metamodel based on finite element computations was chosen for this estimation. The second task was the development of a sampling method which concentrates samples in regions of the parameter space where high quality designs are predicted by the preliminary information while maintaining a good overall coverage. As available methods like rejection sampling or Markov-chain Monte-Carlo methods did not meet the requirements in terms of sample distribution and input correlation, a new multi-fidelity sampling method called "Filtered Sampling"has been developed. The last task was the development of an automated computational workflow. This workflow encompasses geometry parametrization, geometry generation, grid generation and computation of the aerodynamic performance and the structure mechanic loading. Special emphasis was put into the development of a geometry parametrization strategy based on fluid mechanic considerations to prevent the generation of physically inexpedient designs. Finally, the optimization strategy, which utilizes the previously developed tools, was successfully employed to carry out three optimization tasks. The efficiency of the method was proven by the first and second testcase where an existing compressor design was optimized by the presented method. The results were comparable to optimizations which did not take preliminary information into account, while the required computational expense cloud be halved. In the third testcase, the method was applied to generate a new impeller design. In contrast to the previous examples, this optimization featuredlargervariationsoftheimpellerdesigns. Therefore, theapplicability of the method to parameter spaces with significantly varying designs could be proven, too.

Author: Wing Ng
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 216

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Contains 19 papers given at the November 1995 symposium held in San Francisco, California. Topics include aeroelastic analysis of ducted rotors; prediction of the effect of diffuser width on the diffusion process in a radial vaneless diffuser; a solution adaptive unstructured mesh method for cascade flow calculations; low-speed turbine computation by pressure- correction and time marching methods; numerical investigation of the unstart phenomenon in an axisymmetric supersonic inlet; and CFD modeling of a gas turbine combustor air swirler effect. Indexed by author only. Annotation copyright by Book News, Inc., Portland, OR

Author:
Publisher:
ISBN:
Category : Cogeneration of electric power and heat
Languages : en
Pages : 774

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Author:
Publisher:
ISBN:
Category : Cogeneration of electric power and heat
Languages : en
Pages : 532

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