Flow Analysis and Modeling of Centrifugal Compressor Impellers PDF Download

Author: Zeyad A. Al-Suhaibani
Publisher:
ISBN:
Category : Compressors
Languages : en
Pages : 304

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Author: Fahua Gu
Publisher:
ISBN:
Category : Compressors
Languages : en
Pages : 484

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Book Description

Author: Rene Van den Braembussche
Publisher: John Wiley & Sons
ISBN: 1119424100
Category : Technology & Engineering
Languages : en
Pages : 606

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Book Description
A comprehensive overview of fluid dynamic models and experimental results that can help solve problems in centrifugal compressors and modern techniques for a more efficient aerodynamic design. Design and Analysis of Centrifugal Compressors isacomprehensive overview of the theoretical fluid dynamic models describing the flow in centrifugal compressors and the modern techniques for the design of more efficient centrifugal compressors. The author — a noted expert in the field, with over 40 years of experience — evaluates relevant numerical and analytical prediction models for centrifugal compressors with special attention to their accuracy and limitations. Relevant knowledge from the last century is linked with new insights obtained from modern CFD. Emphasis is to link the flow structure, performance and stability to the geometry of the different compressor components. Design and Analysis of Centrifugal Compressors is an accessible resource that combines theory with experimental data and previous research with recent developments in computational design and optimization. This important resource Covers the basic information concerning fluid dynamics that are specific for centrifugal compressors and clarifies the differences with axial compressors Provides an overview of performance prediction models previously developed in combination with extra results from research conducted by the author Describes helpful numerical and analytical models for the flow in the different components in relation to flow stability, operating range and performance Includes the fundamental information for the aerodynamic design of more efficient centrifugal compressors Explains the use of computational fluid dynamics (CFD) for the design and analysis of centrifugal compressors Written for engineers, researchers and designers in industry as well as for academics specializing in the field, Design and Analysis of Centrifugal Compressors offers an up to date overview of the information needed for the design of more effective centrifugal compressors.

Author: Y.E. Tan
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Author: Yinghui Dai
Publisher:
ISBN:
Category : Compressors
Languages : en
Pages : 334

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Book Description

Author: Manoj Kumar Gupta
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Book Description
An analysis is developed for a compressible bulk-flow model of the leakage path between a centrifugal compressor's impeller shroud and housing along the front and backside of the impeller. This is an extension of analysis performed first by Childs (1989) for a shrouded pump impeller and its housing considering an incompressible fluid, and then later by Cao (1993) using a compressible bulk flow model for the shroud of a cryogenic fluid pump. The bulk-flow model is used to develop a reaction force and moment model for the shroud of a centrifugal compressor by solving the derived governing equations and integrating the pressure and shear stress distribution. Validation is done bycomparing the results to published measured moment coefficients by Yoshida et al.(1996). The comparison shows that the shroud casing clearance flow and the fluid force moment can be simulated by the bulk flow model fairly well. An Iwatsubo-based labyrinth seal code developed by Childs and Scharrer (1986) is used to calculate the rotordynamic coefficients developed by the labyrinth seals in the compressor. Tangential force and transverse moment components acting on the rotor are found to have a destabilizing influence on the rotor for a range of precession frequencies. Rotordynamic coefficients are derived for a single stage of a multistage centrifugal compressor, and a comparison is made to stability predictions using Wachel's coefficient using the XLTRC (rotordynamic FEA code). For the model employed, Wachel's model predicts a slightly lower onset speed of instability. The results also show that leakage that flows radially inwards on the back shroud has a greater destabilizing influence than leakage flow that is radially outwards. Seal rub conditions are simulated by increasing the clearance and simultaneously decreasing the tooth height, which increased the leakage and the swirl to the eye seal inlet; and therefore reduced stability. Calculated results are provided for different seal clearances and tooth height, for seal and shroud forces and moments.

Author: John Robert Fagan
Publisher:
ISBN:
Category : Centrifugal compressors
Languages : en
Pages : 0

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Book Description
A series of experiments are performed to investigate and quantify the three-dimensional mean flow field in centrifugal compressor flow passages and to evaluate contemporary internal flow models. The experiments include the acquisition and analysis of LDV data in the impeller passages of a low-speed moderate-scale research mixed-flow centrifugal compressor operating at its design point. Predictions from a viscous internal flow model are then correlated with these data. The LDV data show the traditional jet-wake structure observed in many centrifugal compressors, with the wake observed along the shroud 70 percent of the length from the pressure to suction surface. The viscous model predicts the major flow phenomena. However, the correlations of the viscous predictions with the LDV data were poor.

Author:
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 0

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Book Description
The ability to acquire blade loadings (surface pressure distributions) and surface flow visualization on an unshrouded centrifugal compressor impeller is demonstrated. Circumferential and streamwise static pressure distributions acquired on the stationary shroud are also presented. Data were acquired in a new facility designed for centrifugal compressor aerodynamic research. Blade loadings calculated with a blade-to-blade potential flow analysis are compared with the measured results. Surface flow visualization reveals some complex aspects of the flow on the surface of the impeller blading and hub.

Author: Michael Casey
Publisher: Cambridge University Press
ISBN: 1108416675
Category : Science
Languages : en
Pages : 789

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Book Description
An introduction to the theory and engineering practice that underpins the component design and analysis of radial flow turbocompressors. Drawing upon an extensive theoretical background and years of practical experience, the authors provide descriptions of applications, concepts, component design, analysis tools, performance maps, flow stability, and structural integrity, with illustrative examples. Features wide coverage of all types of radial compressor over many applications unified by the consistent use of dimensional analysis. Discusses the methods needed to analyse the performance, flow, and mechanical integrity that underpin the design of efficient centrifugal compressors with good flow range and stability. Includes explanation of the design of all radial compressor components, including inlet guide vanes, impellers, diffusers, volutes, return channels, de-swirl vanes and side-streams. Suitable as a reference for advanced students of turbomachinery, and a perfect tool for practising mechanical and aerospace engineers already within the field and those just entering it.

Author: L. M. Larosiliere
Publisher:
ISBN:
Category :
Languages : en
Pages : 30

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Book Description
The performance and flow structure in an unshrouded impeller of approximately 4:1 pressure ratio is synthesized on the basis of a detailed analysis of 3D viscous CFD results and aerodynamic measurements. A good data match was obtained between CFD and measurements using laser anemometry and pneumatic probes. This solidified the role of the CFD model as a reliable representation of the impeller internal flow structure and integrated performance. Results are presented showing the loss production and secondary flow structure in the impeller. The results indicate that while the overall impeller efficiency is high, the impeller shroud static pressure recovery potential is underdeveloped leading to a performance degradation in the downstream diffusing element. Thus, a case is made for a follow-on impeller parametric design study to improve the flow quality. A strategy for aerodynamic performance enhancement is outlined and an estimate of the gain in overall impeller efficiency that might be realized through improvements to the relative diffusion process is provided.