Active Control of Surge in Compressors Which Exhibit Abrupt Stall PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Active Control of Surge in Compressors Which Exhibit Abrupt Stall PDF full book. Access full book title Active Control of Surge in Compressors Which Exhibit Abrupt Stall by P. Glannattaslo. Download full books in PDF and EPUB format.
Author: P. Glannattaslo
Publisher:
ISBN:
Category :
Languages : en
Pages : 12
Get Book Here
Book Description
The present paper reports a study on the dynamic behaviour of a compression system based on a multi-stage centrifugal blower and provided with a device for the active suppression of surge instability. The control device includes a sensor of total pressure at the compressor inlet a proportional- derivative controller and an actuation valve at the plenum exit. A non-linear lumped- parameter model of the controlled compression system is presented. which considers also the time-lags in the compressor and actuator unsteady responses. The numerical simulation shows that: i) the predictions of control effectiveness provided by the non-linear model are rather different from the estimates of a linear approach mainly due to the abrupt stall which affects the compressor characteristics: ii) the present control device is capable of suppressing surge within almost the whole unstable operating range of the compressor with values of the proportional gain small enough to avoid actuator saturation (stroke- end occurrence); iii) the derivative component of the control law exerts a poor influence on the system stabilization and can be thus removed: iv) the proposed control strategy is effective over a wide range of stability parameter B which implies the possibility of suppressing surge also at the highest compressor speeds and when using large plenum volumes. On the basis of the numerical results, a practical control device has been designed. which consists of a transducer of differential pressure between plenum and compressor exit (equivalent to a sensor of compressor face total pressure, a butterfly throttle/actuation valve driven by a Stepper motor and a computer, provided with proper interfaces, for signal acquisition, data processing and motor control.
Author: P. Glannattaslo
Publisher:
ISBN:
Category :
Languages : en
Pages : 12
Get Book Here
Book Description
The present paper reports a study on the dynamic behaviour of a compression system based on a multi-stage centrifugal blower and provided with a device for the active suppression of surge instability. The control device includes a sensor of total pressure at the compressor inlet a proportional- derivative controller and an actuation valve at the plenum exit. A non-linear lumped- parameter model of the controlled compression system is presented. which considers also the time-lags in the compressor and actuator unsteady responses. The numerical simulation shows that: i) the predictions of control effectiveness provided by the non-linear model are rather different from the estimates of a linear approach mainly due to the abrupt stall which affects the compressor characteristics: ii) the present control device is capable of suppressing surge within almost the whole unstable operating range of the compressor with values of the proportional gain small enough to avoid actuator saturation (stroke- end occurrence); iii) the derivative component of the control law exerts a poor influence on the system stabilization and can be thus removed: iv) the proposed control strategy is effective over a wide range of stability parameter B which implies the possibility of suppressing surge also at the highest compressor speeds and when using large plenum volumes. On the basis of the numerical results, a practical control device has been designed. which consists of a transducer of differential pressure between plenum and compressor exit (equivalent to a sensor of compressor face total pressure, a butterfly throttle/actuation valve driven by a Stepper motor and a computer, provided with proper interfaces, for signal acquisition, data processing and motor control.
Author: R. C. Pampreen
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 532
Get Book Here
Book Description
High efficiency axial and centrifugal compressors are important in fields as diverse as aircraft engines, superchargers and turbochargers, process and refrigeration compressors. Compressors must achieve high efficiency in blade rows in diffusing flow fields. Of equal and sometimes greater importance is the range os stable operation of the compressor. Blade row stall characteristics determine the limit os stable operation. Blading can stall uniformly with symmetric flow breakdown or asymmetrically in rotating stall, wich propagates around the periphery of the blade row. Depending on aerodynamic conditions, surge may occur instead of, in concert with, or subsequent to blade row stall. The transient breakdown and recovery of aerodynamic loading not only limits compressor performance but also leads to mechanical failures caused by the vibrational loads imposed on the blades. There is no need to know what initiates these performance limits so that surge and stall margins can be optimized and control strategies can be planned. the first step toward understanding is to be knowledgeable about he physical processes occurring during surge and stall. This will permit the designer to anticipate variable geometry needs such as variable inlet guide vanes, variable statuors, and bleed port strategies. Theoritical treatment is far from being well established, however, there are many approaches discussed in the literature. This book is a unique reference to the subject matter. Physical descriptions of the phenomena are given, test results are presented, and analytical studies are discussed. There has been much written about the experimental investigations and theoretical treatments related to surge and stall. To assist those who would pursue advancements in furthering ou knowledge of surge and stall, it seemed appropriate to have a resource that contains a compendium of information on this subject. That is the purpose of this book. [Source : d'après la 4e de couverture].
Author: Massachusetts Institute of Technology. Gas Turbine Laboratory
Publisher:
ISBN:
Category :
Languages : en
Pages : 263
Get Book Here
Book Description
Author: Jan Tommy Gravdahl
Publisher:
ISBN: 9781447108283
Category :
Languages : en
Pages : 248
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category : Mechanical engineering
Languages : en
Pages : 428
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category : Mechanical engineering
Languages : en
Pages : 420
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 10
Get Book Here
Book Description
Having demonstrated in previous years the ability to model, identify, and control rotating stall, our research has concentrated in the past year on refinements and extensions to the compressor modeling developed for active control research. The areas in which progress has been made are: (1) refinement of the basic fluid mechanics based on identification results, (2) understanding the effects of distortion on wave detection, and (3) using the nonlinear form of the rotating stall model to simulate short-circumferential-extent waves. Three-stage actively stabilized compressor experiments supported this work, and further verified that rotating stall stabilization is a viable concept.
Author: Judith Ellen Pinsley
Publisher:
ISBN:
Category :
Languages : en
Pages : 386
Get Book Here
Book Description
Author: Eyad Abed
Publisher:
ISBN:
Category :
Languages : en
Pages : 11
Get Book Here
Book Description
Research was conducted in five main areas: (1) Nonlinear Dynamics of Compression Systems; (2) Synthesis of Robust Nonlinear Controllers; (3) Global Stability Analysis of Controllers; (4) Modeling Enhancements; and (5) Modal Participation and Instability Precursors. Results are described in the report along with the bibliography of published papers resulting from this grant.
Author: J. V. Prasad
Publisher:
ISBN:
Category :
Languages : en
Pages : 10
Get Book Here
Book Description
Approaches for active control of surge in axial and centrifugal compressors are based for their majority on sensing them after they occur and then taking appropriate action. On the other hand some studies in the past have showed that precursors to surge exist in some cases. But very few studies have actually made use of precursors for active control. In this paper we show experimentally that surge precursors exist in centrifugal compressors. Further we formulate a novel control scheme in which a real time observer is used for on-line identification of magnitude and frequency of dominant precursor waves. The observer outputs feed into a fuzzy logic control scheme and the identified frequency and amplitude of the precursors are used to actuate a bleed valve and/or a feel valve for active control of compressor surge. Experimental results demonstrating the viability of the overall scheme are presented.
