Topic

# Gas compressor

About: Gas compressor is a(n) research topic. Over the lifetime, 91817 publication(s) have been published within this topic receiving 552209 citation(s).

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01 Jan 1973

TL;DR: In this article, the authors present an analysis of the performance of simple gas turbines for aircraft propulsion and demonstrate that simple gas turbine cycles can be used to achieve state-of-the-art performance.

Abstract: 1. Introduction 2. Shaft power cycles 3. Gas turbine cycles for aircraft propulsion 4. Centrifugal compressors 5. Axial flow compressors 6. Combustion systems 7 Axial and radial flow turbines 8. Prediction of performance of simple gas turbines 9. Prediction of performance - further topics Appendix A Some notes on gas dynamics Appendix B Problems Appendix C References Index

1,168 citations

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TL;DR: In this paper, an approximate theory for post-stall transients in multistage axial compression systems is presented, which leads to a set of three simultaneous nonlinear third-order partial differential equations for pressure rise, and average and disturbed values of flow coefficient, as functions of time and angle around the compressor.

Abstract: An approximate theory is presented for post-stall transients in multistage axial compression systems. The theory leads to a set of three simultaneous nonlinear third-order partial differential equations for pressure rise, and average and disturbed values of flow coefficient, as functions of time and angle around the compressor. By a Galerkin procedure, angular dependence is averaged, and the equations become first order in time. These final equations are capable of describing the growth and possible decay of a rotating-stall cell during a compressor mass-flow transient. It is shown how rotating-stall-like and surgelike motions are coupled through these equations, and also how the instantaneous compressor pumping characteristic changes during the transient stall process.

768 citations

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01 Jan 1996

TL;DR: In this paper, the authors provide an introduction to gas turbine engines and jet propulsion for aerospace or mechanical engineers, which is divided into four parts: introduction to aircraft propulsion; basic concepts and one-dimensional/gas dynamics; parametric (design point) and performance (off-design) analysis of air breathing propulsion systems; and analysis and design of major gas turbine engine components (fans, compressors, turbines, inlets, nozzles, main burners, and afterburners).

Abstract: This text provides an introduction to gas turbine engines and jet propulsion for aerospace or mechanical engineers The text is divided into four parts: introduction to aircraft propulsion; basic concepts and one-dimensional/gas dynamics; parametric (design point) and performance (off-design) analysis of air breathing propulsion systems; and analysis and design of major gas turbine engine components (fans, compressors, turbines, inlets, nozzles, main burners, and afterburners) Design concepts are introduced early (aircraft performance in introductory chapter) and integrated throughout Written with extensive student input on the design of the book, the book builds upon definitions and gradually develops the thermodynamics, gas dynamics, and gas turbine engine principles

539 citations

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TL;DR: In this article, a simplified combustion system, from compressor outlet to turbine inlet, is modeled as a one-dimensional mean with linear perturbations, which leads to predictions for the frequencies of oscillations and the susceptibility to instabilities for which linear disturbances grow expotentially in time.

Abstract: Combustion instability has become a major issue for gas turbine manufacturers. Stricter emission regulations, particularly on nitrogen oxides, have led to the development of new combustion methods, such as lean premixed prevaporized(LPP)combustion,to replacethetraditionaldiffusion e ame.However,LPPcombustionismuchmore liable to generate strong oscillations, which can damage equipment and limit operating conditions. As a tutorial, methods to investigate combustion instabilities are reviewed. Theemphasis is on gas turbine applications and LPP combustion. The e ow is modeled as a one-dimensional mean with linear perturbations. Calculations are typically done in the frequency domain. The techniques described lead to predictions for the frequencies of oscillations and the susceptibility to instabilities for which linear disturbances grow expotentially in time. Appropriate boundary conditions are discussed, as is the change in the linearized e ow across zones of heat addition and/or area change. Many of the key concepts are e rst introduced by considering one-dimensional perturbations. Later higher-order modes, particularly circumferential waves, are introduced, and modal coupling is discussed. The modeling of a simplie ed combustion system, from compressor outlet to turbine inlet, is described. The approaches are simple and fast enough to be used at the design stage.

480 citations

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23 Jul 1990

TL;DR: In this paper, the authors present a simple model of a simple rotor with three disc bearing elements for industrial applications and derive the minimum shaft radius branched systems in torsion analysis for industrial electric motor centrifugal compressor unit.

Abstract: Part 1 Characteristics of rotor elements: disc shaft bearings and seals mass unbalance. Part 2 Simple models - basic phenomena: determination of the model symmetric rotor dissymmetric rotor instability damped rotors. Part 3 Rotor equations - solutions of equations: finite elements of rotor elements equations for monorotors equations for coaxial multirotors solution of equations computer program. Part 4 Towards industrial applications: pseudo-modal method influence of modeling natural frequencies - bearing stiffness diagram transmissibility dual rotor. Part 5 Industrial applications: steam compressor high pressure centrifugal compressor low pressure centrifugal compressor centrifugal compressor fitted with active magnetic bearings power gas turbine industrial steam turbine textile machine spindle jet engine. Part 6 Transient motions: equations and solutions speed of rotation law behaviour of a simple rotor experimental and theoretical results for a three disc rotor behaviour of an industrial rotor. Part 7 Torsion: determination from statics of the minimum shaft radius branched systems in torsion analysis of a branched system in torsion industrial electric motor-centrifugal compressor unit. Part 8 Miscellaneous topics: dissymmetric shaft equations with periodic coefficients axial torque influence.

408 citations