Axial compressor

About: Axial compressor is a research topic. Over the lifetime, 12035 publications have been published within this topic receiving 127766 citations.

Fundamentals of Turbomachinery

Abstract: List of Symbols. Chapter 1: INTRODUCTION. 1 1 Definition. 1 2 Types of Turbomachines. 1 3 Applications of Turbomachines. 1 4 Performance Characteristics. 1 5 Methods of Analysis. 1 6 Historical Evolution of Turbomachines. 1 7 Organization of the Book. References. Chapter 2: Dimensional Analysis . 2 1 Dimensions and Dimensional Homogeneity. 2 2 Buckingham Pi Theorem. 2 3 Other Nondimensional Parameters for Turbomachines. 2 4 Similarity Laws. References. Problems. Chapter 3: Energy Transfer In Turbomachines. 3 1 Review on Fluid Mechanics Related to Turbomachinery. 3 2 Energy in Flowing Fluids. 3 3 Euler Equations. 3 4 Equations for Axial Flow Machines. 3 5 Equations for Mixed and Radial Flow Machines. 3 6 Degree of Reaction. References. Problems. Chapter 4: Centrifugal Pumps. 4 1 Basic Construction and Classification. 4 2 Basic Working Principles. 4 3 Performance Characteristics. 4 4 Cavitation. 4 5 Performance Modifications. 4 6 Preliminary Design Procedure. 4 7 Pump Performance Tests. 4 8 Pumping Systems. 4 9 Pump Applications. 4 10 Pump Selections. References. Problems. Chapter 5: Axial Flow Pumps and Fans. 5 1 Introduction. 5 2 Flow over Isolated Airfoils. 5 3 Axial Flow Cascade. 5 4 Preliminary Design Procedure. 5 5 Three Dimensional Flow Effects Radial Equilibrium Requirement. 5 6 Fans Test. 5 7 Fans Application. 5 8 Fans and Systems. 5 9 Fans Selection. 5 10 Propellers. References. Problems. Chapter 6: Centrifugal Fans, Blowers and Compressors. 6 1 Classification. 6 2 Performance Parameters and Characteristics. 6 3 Change of Performance. 6 4 Polytropic Efficiency. 6 5 Preliminary Design of Centrifugal Fans. 6 6 Preliminary Design of Centrifugal Compressors. 6 7 Applications of Centrifugal Compressors. 6 8 Selection of Compressors. References. Problems. Chapter 7: Axial Flow Compressors. 7 1 Introduction. 7 2 Basic Theory. 7 3 Preliminary Design of Compressor Stage. 7 4 Determination of Stage Efficiency. 7 5 Effects of Compressibility and Shock Waves. 7 6 Axial Flow Compressor Performance. 7 7 Surge and Stall in Compressor and the Remedies. References. Problems. Chapter 8: Gas Turbines. 8 1 Introduction. 8 2 Thermodynamics of Axial Flow Turbine. 8 3 Degree of Reaction. 8 4 Preliminary Design Procedure for Turbine Stage. 8 5 Determination of Turbine Stage Efficiency. 8 6 Axial Flow Turbine Performance. 8 7 Compressor, Turbine Matching. 8 8 Radial Inflow Gas Turbine. 8 9 Thermodynamic Processes in Radial Inflow Gas Turbine. 8 10 Other Topics Related to Gas Turbine Engine. 8 11 Applications of Gas Turbine Engine. References. Problems. Chapter 9: Steam Turbines. 9 1 Introduction. 9 2 Velocity Compounded Stage. 9 3 Classification of Steam Turbines. 9 4 Steam Turbines Parameters and Performance. 9 5 Cogeneration and Combined Cycle Plants. References. Problems. Chapter 10: Hydraulic Turbines. 10 1 Introduction to Hydropower. 10 2 Types of Hydraulic Turbines. 10 3 Selection of Hydraulic Turbines. 10 4 Hydraulic Turbine Performance Characteristics. 10 5 Pelton Turbine. 10 6 Francis Turbine and Kaplan Turbine. References. Problems. Chapter 11: Wind Turbines. 11 1 Introduction to Wind Power. 11 2 Actuator Theory. 11 3 Types of Wind Turbines. 11 4 Wind Turbines Characteristics and Preliminary Design Analysis. 11 5 Variable Speed Performance of Wind Turbines. 11 6 Wind Turbine Applications. References. Problems. Appendix A: Review on Thermodynamics and Compressible Flow. A 1 Thermodynamic Properties. A 2 Thermodynamic Processes. A 3 Other Thermo Flow Properties. A 4 Adiabatic Efficiencies of Flow Components. A 5 Thermodynamic Cycles. A 6 Thermodynamic Cycles of Gas Turbine Engines. A 7 Rankine Cycles with Vapor. A 8 Compressible Flow through a Channel. A 9 Normal Shock Waves. A 10 Oblique Shock Waves. References. Problems. Appendix B: Airfoil Characteristics. B 1 Flow Over Objects. B 2 Airfoil Geometry. B 3 NACA Airfoil Specification. References. Appendix C: CFD Applications to Turbomachines Design and Flow Analysis. Appendix D: Conversion Factors & Some Constants. Appendix E: Thermodynamic Properties of Air and Water at STP. Appendix F Internal Diameter of Standard Pipe of Schedule 40. Appendix G Compressibility Chart.

Design and Testing of a Controlled Diffusion Airfoil Cascade for Industrial Axial Flow Compressor Application

Abstract: Similar to jet engine development, modern design methods are used today to improve the performance of industrial compressors. In order to verify the loading limits, a cascade profile representative for the first rotor hub section of an industrial compressor has been designed by optimizing the suction surface velocity distribution using a direct boundary layer calculation method. The blade shape was computed with an inverse full potential code and the resulting cascade was tested in a cascade wind tunnel. The experimental results confirmed the design intent and resulted in a low loss coefficient of 1.8 percent at design condition and an incidence range of nearly 12 deg (4 percent loss level) at an inlet Mach number of 0.62.

The influence of the wake on the stability of cantilevered flexible plates in axial flow

Abstract: Cantilevered flexible plates in axial flow lose stability through flutter. Using the inextensibility condition for the cantilevered nonlinear plate equation of motion and the unsteady lumped-vortex model to calculate the fluid loads, a flutter boundary has been obtained. In the time-domain analysis performed to this end, the wake behind the oscillating cantilevered plate is assumed to issue tangentially from the free trailing edge and extend downstream with an undulating form. The influence of the wake on system stability may be characterized in terms of the non-dimensional mass ratio, reduced flow velocity and flutter frequency. For large values of the mass ratio, the plate vibrates with high frequency and high-order mode content. It is shown that the wake has less influence on system stability for long plates than it does for short ones.

Speed and surge control for a low order centrifugal compressor model

Abstract: Previous work on stabilization of compressor surge is extended to include control of the angular velocity of the compressor. First, a low order centrifugal compressor model is presented where the states are mass flow, pressure rise and rotational speed of the spool. Energy transfer considerations are used to develop a compressor characteristic. In order to stabilize equilibriums to the left of the surge line, a close coupled valve is used in series with the compressor. Controllers for the valve pressure drop and spool speed are derived. Semi-global exponential stability is proved using a Lyapunov argument.