Download or read book Predicting Stage Performance of a Multi stage Centrifugal Compressor Using the Overall Compressor Performance Characteristic written by Dirk Cornelius Human and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The reliable operation of Integrally Geared Centrifugal Compressors (IGCCs), used in the coal-fired power generation industry of South Africa, is essential for economic, environmental and safety considerations. However, due to the unavailability of individual stage performance curves, the ability of a compressor owner to identify underperforming stages to maintain these compressors proactively remains limited. This study addresses the stage performance prediction of an IGCC when only the compressor's overall performance characteristic, in conjunction with the impeller diameters and tip speeds, are known. The study is limited to IGCCs used in the coal-fired power generation industry of South Africa. Based on the limited inputs, two performance modelling methods were considered for this application, namely stage stacking and 1-dimensional modelling. However, stage stacking requires known operating points on each stage performance curve from which the rest of the curve can be extrapolated while 1-dimensional models require detailed stage design information to model stage performance. This study developed a revised stage stacking procedure which in contrast to the traditional stage stacking procedure, does not require a known operating point on each stage's performance curve, for it assesses the relative stage performance at the compressor's surge flow rate. The relative maximum pressure ratio of each stage is acquired through the application of similarity principles while a simplified 1-dimensional impeller analysis model is used to assess relative impeller head coefficients. The modelling process was developed based on performance and design data for IGCCs obtained from a compressor manufacturer. Performance data of four IGCCs, consisting of 13 stages, were obtained, including the design data for ten impellers. Hence, the IGCCs satisfy the requirements of geometric and aerodynamic similarity, unveiling a linear relationship between the stage impeller tip speed and maximum pressure ratio. A simplified 1-dimensional performance model was used to assess relative impeller head coefficients. A verification procedure ensured the integrity of the findings of the 1-dimensional model was maintained by comparing the model results to findings obtained using commercial compressor performance modelling software. A sensitivity analysis was conducted on the 1-dimensional performance model to ascertain which input parameters could be scaled as a function of the impeller tip diameter. For the four IGCCs for which data were obtained, the stage-discharge pressure and isentropic efficiency curves were calculated using the developed model. The maximum variation between the measured and calculated pressure and isentropic efficiency curves equaled 8.20% and 10.84%, respectively. The prediction accuracy of the developed modelling procedure is similar to map-based models found in literature and is considered adequate for identifying an underperforming stage. Thus, the developed model could serve as a valuable conditioning monitoring tool for site-based compressor owners.
Download or read book Reconstruction of Individual Aerodynamic Performance Stage Characteristics from Multistage Compressor Flange to flange Test Data written by Leon Sapiro and published by . This book was released on 1990 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: An iterative procedure was devised for reconstructing the aerodynamic performance characteristics of each of the stages of a multistage compressor when only the overall performance, determined from flange-to-flange measurements, is available. The need for this procedure originated during the closed loop testing of a new family of centrifugal compressor stages. To reduce the number of builds and thus expedite the testing time, the compressors were assembled in a series of two-stage configurations. Some of those stages were used in two different builds: in one, they were preceded by the next stage of higher specific speed; and in the other, they were followed by the next stage of smaller specific speed. Uncertainties of the interstage temperature and pressure measurements, which could not be resolved during the closed loop testing, necessitated the creation of a method for reconstructing the characteristics of each of the two stages of each build, which would be based only on the overall measurements taken at the inlet and outlet flanges. Using this iterative procedure, the individual stage characteristics of the new family of compressor stages were reconstructed and later applied to the performance prediction of many multistage production units of that family. The number of stages ranged from 2 to 8. Factory test results have shown very good agreement with the prediction.
Download or read book Aerodynamic Shop Testing Multistage Centrifugal Compressors and Predicting Gas Performance written by S. Sayyed and published by . This book was released on 1978 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book STGSTK A Computer Code for Predicting Multistage Axial Flow Compressor Performance by a Meanline Stage Stacking Method written by and published by . This book was released on 1982 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Technique to Predict Stage by stage Pre stall Compressor Performance Characteristics Using a Streamline Curvature Code with Loss and Deviation Correlations written by Jason Brent Klepper and published by . This book was released on 1998 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Centrifugal Compressor Stage written by Thomas Barker Ferguson and published by . This book was released on 1963 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Radial Flow Turbocompressors written by Michael Casey and published by Cambridge University Press. This book was released on 2021-06-10 with total page 789 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Design and Analysis of Centrifugal Compressors written by Rene Van den Braembussche and published by John Wiley & Sons. This book was released on 2019-04-08 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Prediction of an Axial Compressor Stage Characteristic from a One point Measurement written by Shahnaz M. Punjani and published by . This book was released on 1995 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Compressor Instability with Integral Methods written by Eddie Y.K. Ng and published by Springer Science & Business Media. This book was released on 2007-07-07 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book brings together the quick integral approaches and advances in the field for the prediction of stall and surge problems in the compressor. The book is useful for people involved in the flow analysis, design and testing of rotating machinery. For students, it can be used as a specialized topic of senior undergraduate or graduate study. The book can also serve as self-study material.
Download or read book Process Centrifugal Compressors written by Klaus H. Lüdtke and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 341 pages. Available in PDF, EPUB and Kindle. Book excerpt: Originating in the process compressor industry, this text primarily addresses: rotating equipment engineers, project engineers, engineering contractors, and compressor user companies in oil and gas field operations, natural gas processing, petroleum refining, petrochemical processing, industrial refrigeration, and chemical industries. It enables the reader to assess compressors and defines the constraints influencing the compressor design.
Download or read book Three dimensional performance prediction of multistage axial flow compressors with a repeating stage model ASME 99 GT 290 written by Y. G. Li and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presented at the International Gas Turbine & Aeroengine Congress & Exhibition, Indianapolis, Indiana, June 7-June 10, 1999.
Download or read book Compressor Performance written by Theodore Gresh and published by Newnes. This book was released on 2001-05-17 with total page 215 pages. Available in PDF, EPUB and Kindle. Book excerpt: Compressor Performance is a reference book and CD-ROM for compressor design engineers and compressor maintenance engineers, as well as engineering students. The book covers the full spectrum of information needed for an individual to select, operate, test and maintain axial or centrifugal compressors. It includes basic aerodynamic theory to provide the user with the "how's" and "why's" of compressor design. Maintenance engineers will especially appreciate the troubleshooting guidelines offered. Includes many example problems and reference data such as gas properties and flow meter calculations to enable easy analysis of compressor performance in practice. Includes companion CD with computer programs.M. Theodore Gresh has been with the Elliot Company in Jeannette, Pennsylvania, since 1975, initially working on the mechanical and aerodynamic design and application of centrifugal compressors.Unrivalled coverage of the theory and practical use of all kinds of compressors in industrial use from an industry-leading company sourceComplete subject reference and learning resource in one stop, suitable for newly graduated engineers and experienced professional reference useIncludes companion CD-ROM
Download or read book Use of Stage stacking Technique for Predicting Over all Performance in Multistage Axial flow Compressor Utilizing Interstage air Bleed written by James G. Lucas and published by . This book was released on 1958 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modification of a One dimensional Dynamic Compression System Model to Calculate Stage Characteristics Internally written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A one-dimensional, dynamic gas turbine engine performance analysis program, based on a modified parallel compressor theory, was enhanced with an added capability to calculate compressor stage characteristics given basic blade correlations, blade and casing geometry, and flow conditions. Total pressure ratio and total temperature ratio across rotors and stators had previously been provided solely by stage characteristics maps created using experimental data or computational means. The user now has the option to have those ratios, or characteristics, calculated via a one-dimensional code during the simulation. Experimental data is still required for calibration of this characteristics prediction code. An existing characteristics prediction code was integrated as a subroutine of the performance analysis program. With flow conditions at the stage inlet and basic stage geometry information provided, the characteristics prediction code calculates the desired ratios and feeds them back to the analysis code. The performance analysis program interacts with the characteristic prediction code whenever rotor or stator performance is required, so it can be run in a steady state or dynamic condition, with or without parallel compressor theory. The modifications allow it to simulate radial and circumferential mass redistribution, as well as radial work redistribution between the parallel flow segments. These, in turn, make it possible to model the effects of radial and circumferential inlet flow distortion on overall compressor performance. The interface with the characteristic prediction code enables separate characteristics to be calculated for each parallel flow segment. The characteristics prediction code calculates the stage pressure and temperature ratios along an averaged streamline, or meanline. Called the Meanline Code (capitalized to specify the particular algorithm used here), this code uses a correlation to provide stage loss and deviation. Since the correlation used is not sufficiently general, add-loss and add-deviation values are tabulated, or mapped, against corrected mass flow. The one-dimensional Meanline Code performs its calculations along a streamline specified by the meanline velocity density ratio (MVDR), also tabulated against mass flow in the map. The modeling technique and calibration process were validated using experimental data from NASA Rotor 1B, a single rotor compressor test bed. The new capability to calculate stage characteristics directly makes it possible to perform analyses of an engine without detailed compressor stage performance data. It also takes an important step toward increasing DYNTECC's capabilities.
Download or read book Computational Analysis of a Multistage Axial Compressor written by Chaithanya Mamidoju and published by . This book was released on 2014 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt: Turbomachines are used extensively in Aerospace, Power Generation, and Oil & Gas Industries. Efficiency of these machines is often an important factor and has led to the continuous effort to improve the design to achieve better efficiency. The axial flow compressor is a major component in a gas turbine with the turbine's overall performance depending strongly on compressor performance. Traditional analysis of axial compressors involves through flow calculations, isolated blade passage analysis, Quasi-3D blade-to-blade analysis, single-stage (rotor-stator) analysis, and multi-stage analysis involving larger design cycles. In the current study, the detailed flow through a 15 stage axial compressor is analyzed using a 3-D Navier Stokes CFD solver in a parallel computing environment. Methodology is described for steady state (frozen rotor stator) analysis of one blade passage per component. Various effects such as mesh type and density, boundary conditions, tip clearance and numerical issues such as turbulence model choice, advection model choice, and parallel processing performance are analyzed. A high sensitivity of the predictions to the above was found. Physical explanation to the flow features observed in the computational study are given. The total pressure rise verses mass flow rate was computed.
