An Experimental Investigation of Stall and Recovery in an Axial-flow Compressor Subjected to Inlet Distortion PDF Download
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Author: Ann Margaret Sullivan
Publisher:
ISBN:
Category : Compressors
Languages : en
Pages : 344
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Book Description
Author: Ann Margaret Sullivan
Publisher:
ISBN:
Category : Compressors
Languages : en
Pages : 344
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Book Description
Author: J. Fortin
Publisher:
ISBN:
Category : Axial flow compressors
Languages : en
Pages : 0
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Book Description
For many years there has been a significant effort to better understand rotating stall/surge phenomena in axial compressors, as well as the effects of inlet flow distortions. Most experimental investigations to date, whether on laboratory compressors or on full scale jet engines, have tended to focus separately on the effects of these two flow disturbances on compressor performance. The purpose of the present study was to experimentally assess the influence of inlet flow distortions on the inception and nature of rotating stall in a full scale engine compressor. This paper reports results obtained for the first stage rotor of a 10-stage compressor subjected to screen-induced inlet pressure distortions. Previous investigations had shown that during part-speed operation, the front stages operated in rotating stall, and hot-film probe measurements made during the present study showed that the presence of the distortion screens did not affect the speed of the rotating stall pattern, but in some instances changed the number of cells present. However, low frequency flow fluctuations characteristic of surge were much more prevalent when the screens were in place. Also, the further the sensing probe was displaced tangentially in the rotor rotation direction from the screens, the more intense the fluctuations, leading one to conclude that the screens had a localized damping effect on the surge cycle.
Author: Gary R. Ludwig
Publisher:
ISBN:
Category :
Languages : en
Pages : 312
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Book Description
This report presents the results of a research program on rotating stall in axial flow compressors and jet engines. The program had three major objectives which were: (1) develop an analysis for a three-dimensional, time-variant rotating stall and separation theory, (2) develop analysis for poststall operation/recovery and aerodynamically induced exotic metal combustion, and (3) consider the effects of distortion, water ingestion, and nuclear blasts on axial flow compressors. The work done towards accomplishing objective (1) is reported in Volume I. The work done towards the accomplishment of the remaining two objectives is reported in Volume II presented herein. The experimental studies were performed on a low-speed rotating annular cascade facility and on a J-85-5 turbojet engine. The low-speed tests investigated the influence of rotor-stator interference on the work performed by a rotor in a stage prior to and during rotating stall, both with and without inlet distortion. The J-85 experiments consisted of post-stall temperature measurements in the compressor and a demonstration of stall anticipation and stall recovery on this engine with a previously developed rotating stall control system in operation. In addition, some blast tests were performed on the J-85 with the stall control system both operative and inoperative. Comparisons are made between the low-speed experimental results and the predictions of a previously developed two-dimensional rotating stall stability theory. In addition, post-stall analyses were performed on both the low-speed results and the J-85 results for comparison with the predictions of Day, Greitzer, and Cumpsty. (Author).
Author: William G. Costakis
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 40
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Book Description
Author:
Publisher:
ISBN:
Category : Compressors
Languages : en
Pages : 170
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Book Description
Author: Eddie Y.K. Ng
Publisher: Springer Science & Business Media
ISBN: 3540724125
Category : Technology & Engineering
Languages : en
Pages : 154
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Book Description
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.
Author:
Publisher:
ISBN:
Category : Mechanical engineering
Languages : en
Pages : 410
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Book Description
Author: William H. Gauden
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 238
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Book Description
Author:
Publisher:
ISBN:
Category : Mechanical engineering
Languages : en
Pages : 774
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Book Description
Author: Edward J. Milner
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 40
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Book Description
The results presented are of a series of experimental tests in which a J85-13 turbojet engine was subjected to both distorted and undistorted inlet total pressure conditions. A distinctive feature of the data base obtained is that it includes compressor interstage information not previously recorded for a J85-13 engine. Each of the eight compressor stages was instrumented to obtain the characteristics of the individual stages for undistorted inlet conditions, and these data are documented in the report along with the undistorted compressor overall performance. Also included in the report is the overall performance of the compressor exposed to 14 different distorted-inlet conditions - 10 circumferential patterns and 4 radial patterns. The distortion patterns were introduced using screens that spoiled from 8 to 50 percent of the compressor face area; the distortion screen density, or the area blocked by the screen wire per unit area of screen, varied from 26 to 69 percent.
