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Modified Surge in an Axial Flow Compressor
Volume 1: Turbomachinery, 1992This paper deals with an experimental study of the unsteady flow in a multistage axial-flow compressor with a high design flow coefficient (p = 1.2) at rpm lower than the design ones. A detailed description of the rotating stall during the so-called “modified surge” is given.
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1981
The axial flow compressor is the second type of dynamic compressor, whose general nature and capabilities were introduced in section 1.3. It absorbs energy from an external power source, raising the pressure of a continuous flow of working fluid by means of its blading geometry and motion.
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The axial flow compressor is the second type of dynamic compressor, whose general nature and capabilities were introduced in section 1.3. It absorbs energy from an external power source, raising the pressure of a continuous flow of working fluid by means of its blading geometry and motion.
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Growth of a Perturbation in an Axial Flow Compressor
Journal of Engineering for Power, 1979A time-dependent linearized approach is used to predict the amplification or the decay of an initial perturbation in the multistage axial compressor of high hub-to-tip ratio. This analysis shows that for unstalled flow regimes the change in perturbation amplitude remains limited. The linearized theory remains valid until the stall limit.
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Optimized efficiency axial-flow compressor
Applied Energy, 2005A preliminary design efficiency-optimization of an axial-flow compressor, using one-dimensional flow theory, is studied in this paper. A model for the optimum design of a compressor stage, assuming a fixed distribution of axial velocities, is presented. The absolute inlet and exit angles of the rotor are taken as design variables.
Jun Luo +3 more
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Unsteady aerodynamics in an axial flow compressor
2023Current methods for designing compressor blades in axial turbomachines assume that the flow through each blade row is steady. However, interactions associated with the relative motion of neighbouring blade rows are known to produce a disturbance field with both random and periodic components.
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1979
The only additional material here over that in chapter 4 is that it is convenient in the velocity diagrams to specify angles δ and γ for trigonometric purposes and polytropic stage efficiency is of importance since axial compressors, which are usually multistage machines are mostly designed on the basis of one stage with an assumed constant stage ...
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The only additional material here over that in chapter 4 is that it is convenient in the velocity diagrams to specify angles δ and γ for trigonometric purposes and polytropic stage efficiency is of importance since axial compressors, which are usually multistage machines are mostly designed on the basis of one stage with an assumed constant stage ...
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Nonlinear control experiments on an axial flow compressor
Proceedings of the 39th IEEE Conference on Decision and Control (Cat. No.00CH37187), 2002A nonlinear control law is designed for a low order model of an axial flow compressor with a ring of bleed valves after the last compressor stage. The controller is implemented on a low speed, three stage experimental compressor. The region of attraction guaranteed by the control law is experimentally determined and is larger than that of the ...
Shengfang Liao +3 more
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Preliminary Design of Axial Flow Compressors
2020With reference to an axial compressor stage, a procedure for the calculation of kinematic parameters at mean diameter (Sect. 4.1), thermodynamic parameters (Sect. 4.2), geometric parameters (Sect. 4.3), parameters in the radial direction (Sect. 4.4) and stage losses (Sect. 4.5) is provided. Then, Sect.
Marco Gambini, Michela Vellini
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Local observer for axial flow aeroengine compressors
Proceedings of the 10th World Congress on Intelligent Control and Automation, 2012Instability phenomena occurred in aeroengines are certainly very undesirable. The unstable flow not only causes a drastic reduction in the performance of the compressor but also can damage to engine's components during operations. Thus it is necessary and critical to employ various feedback control mechanism to stabilize the system.
Jun Liu +3 more
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On the Aerodynamic Design of Axial-Flow Compressors and Turbines
Journal of Applied Mechanics, 1948Abstract In this paper a theoretical method is presented to determine the flow of a perfect (frictionless, incompressible) fluid across a cascade built up of arbitrary airfoils. The presentation refers to compressor blading but is immediately applicable to turbine blading.
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