Nonlinear instability of axial flow compression systems

1996 ◽  
Author(s):  
Feng Lin ◽  
F. McCaughan
Keyword(s):  
Axial Flow ◽  
Nonlinear Instability ◽  
Flow Compression

Fixed-order dynamic compensation for axial flow compression systems

2002 ◽  
Vol 10 (5) ◽  
pp. 727-734 ◽  
Author(s):  
W.M. Haddad ◽  
J.R. Corrado ◽  
A. Leonessa
Keyword(s):  
Axial Flow ◽  
Dynamic Compensation ◽  
Fixed Order ◽  
Flow Compression

Analysis and Control of Multi-Mode Axial Flow Compression System Models1

1999 ◽  
Vol 122 (3) ◽  
pp. 393-401 ◽  
Author(s):  
MingQing Xiao ◽  
Tamer Bas¸ar
Keyword(s):  
Closed Loop ◽  
Controller Design ◽  
Axial Flow ◽  
Pressure Rise ◽  
Open Loop ◽  
Rotating Stall ◽  
Flow Compression ◽  
The Right ◽  
And Control ◽  
Multi Mode

The paper studies the behavior of multi-mode systems of the Moore-Greitzer model. Its main result is the existence of a parameterized nonlinear state feedback controller which stabilizes the system to the right of the peak of the compressor characteristic. In this process, a rotating stall envelope surface is discovered, and it is shown that the controller design achieves the tasks of preventing the closed-loop system from entering either rotating stall or surge, and making the closed-loop pressure rise coefficient be able to approach its maximum. Numerical simulations of the open-loop and closed-loop models are presented to illustrate the analysis and the results. [S0022-0434(00)00803-0]

Surge-Induced Structural Loads in Gas Turbines

1980 ◽  
Vol 102 (1) ◽  
pp. 162-168 ◽  
Author(s):  
R. S. Mazzawy
Keyword(s):  
Gas Turbines ◽  
Pressure Ratio ◽  
Axial Flow ◽  
Turbine Engine ◽  
Compression System ◽  
Engine Design ◽  
Steady State Levels ◽  
Flow Compression ◽  
Engine Components ◽  
Bypass Ratio

The axial flow compression system of a modern gas turbine engine normally delivers a large quantity of airflow at relatively high velocity. The sudden stoppage (and reversal) of this flow when an engine surges can result in structural loads in excess of steady state levels. These loads can be quite complex due to inherent asymmetry in the surge event. The increasing requirements for lighter weight engine structures, coupled with the higher pressure ratio cycles required for minimizing fuel consumption, make the accurate prediction of these loads an important part of the engine design process. This paper is aimed toward explaining the fluid mechanics of the surge phenomenon and its impact on engine structures. It offers relatively simple models for estimating surge-induced loads on various engine components. The basis for these models is an empirical correlation of surge-induced inlet overpressure based on engine pressure ratio and bypass ratio. An approximate estimate of the post-surge axial pressure distribution can be derived from this correlation by assuming that surge initiation occurs in the rear of the compression system.

scholarly journals Characterizing the Effects of Air Injection on Compressor Performance for Use in Active Control of Rotating Stall

1997 ◽  
Author(s):  
Robert L. Behnken ◽  
Mina Leung ◽  
Richard M. Murray
Keyword(s):  
Hysteresis Loop ◽  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Axial Flow ◽  
Open Loop ◽  
Rotating Stall ◽  
Air Injection ◽  
Loop Control ◽  
Flow Compression

Previous work has developed an air injection controller for rotating stall based on the idea of a shifting compressor characteristic and the Moore-Greitzer three state compressor model. In order to demonstrate this form of control experimentally, a series of open loop tests were performed to measure the performance characteristics of a low speed axial flow compression system when air is injected upstream of the rotor face. The position of the air injection port relative to the hub and the rotor face and the angle relative to the mean axial flow were varied. The tests show that the injection of air has drastic effects on the stalling mass flow rate and on the size of the hysteresis loop associated with rotating stall. The stalling mass flow rate was decreased by 10% and the hysteresis loop was completely eliminated under some conditions. The results of the open loop parametric study were then used to implement a closed loop control strategy based on a shifting characteristic.

Integrated Control of Rotating Stall and Surge in High-Speed Multistage Compression Systems

1998 ◽  
Vol 120 (3) ◽  
pp. 440-445 ◽  
Author(s):  
K. M. Eveker ◽  
D. L. Gysling ◽  
C. N. Nett ◽  
O. P. Sharma
Keyword(s):  
Active Control ◽  
Control Strategy ◽  
High Speed ◽  
Control Strategies ◽  
Integrated Control ◽  
Axial Flow ◽  
Rotating Stall ◽  
Low Flow ◽  
Simultaneous Control ◽  
Flow Compression

Aeroengines operate in regimes for which both rotating stall and surge impose low-flow operability limits. Thus, active control strategies designed to enhance operability of aeroengines must address both rotating stall and surge as well as their interaction. In this paper, a previously developed nonlinear control strategy that achieves simultaneous active control of rotating stall and surge is applied to a high-speed three-stage axial flow compression system with operating parameters representative of modern aeroengines. The controller is experimentally validated for two compressor builds and its robustness to radial distortion assessed. For actuation, the control strategy utilizes an annulus-averaged bleed valve with bandwidth on the order of the rotor frequency. For sensing, measurements of the circumferential asymmetry and annulus-averaged unsteadiness of the flow through the compressor are used. Experimental validation of simultaneous control of rotating stall and surge in a high-speed environment with minimal sensing and actuation requirements is viewed as another important step toward applying active control to enhance operability of compression systems in modern aeroengines.

scholarly journals Concept of Integration of Axial-Flow Compression Into Electric Machine Design

2017 ◽  
Vol 3 (1) ◽  
pp. 118-129 ◽  
Author(s):  
Yingjie Li ◽  
Dheeraj Bobba ◽  
Erik Schubert ◽  
Hao Ding ◽  
Bulent Sarlioglu
Keyword(s):  
Axial Flow ◽  
Electric Machine ◽  
Machine Design ◽  
Electric Machine Design ◽  
Flow Compression
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