Flow instabilities of time-dependent injection schemes in immiscible displacements

2016 ◽  
Vol 94 (11) ◽  
pp. 2061-2071 ◽  
Author(s):  
Tiago F. Lins ◽  
Jalel Azaiez
Keyword(s):  
Time Dependent ◽  
Flow Instabilities ◽  
Immiscible Displacements

Theoretical Study of Flow Instabilities and Inlet Distortions in Axial Compressors

1982 ◽  
Vol 104 (3) ◽  
pp. 715-721 ◽  
Author(s):  
P. Ferrand ◽  
J. Chauvin
Keyword(s):  
Theoretical Study ◽  
Rotating Stall ◽  
Time Dependent ◽  
Flow Instabilities ◽  
Axial Compressors ◽  
Independent Variables ◽  
Servo Mechanism ◽  
Dependent Variables ◽  
Multistage Compressors ◽  
Method Of Evaluation

This paper describes a method of evaluation of the single and multistage compressors response to steady and unsteady inlet distortions. It allows also the evaluation of the appearance of unstable regimes and their characterization (rotating stall and surge). It is based on a linearized approach using mean line calculations. The compressor is considered as a series of vaned and vaneless spaces, and the corresponding equations are solved by use of Fourier series for time independent variables and by Laplace’s transform for time-dependent variables. An analogy between the compressor’s response and a servo-mechanism is developed, using Nyquist’s diagram. Results are compared with experimental data which prove the validity of the approach. A parametric study indicates which parameters can be modified to improve the flow stability.

Theoretical Study of Flow Instabilities and Inlet Distortions in Axial Compressors

1981 ◽  
Author(s):  
P. Ferrand ◽  
J. Chauvin
Keyword(s):  
Theoretical Study ◽  
Rotating Stall ◽  
Time Dependent ◽  
Flow Instabilities ◽  
Axial Compressors ◽  
Independent Variables ◽  
Servo Mechanism ◽  
Dependent Variables ◽  
Multistage Compressors ◽  
Method Of Evaluation

This paper describes a method of evaluation of the single and multistage compressors response to steady and unsteady inlet distortions. It allows also the evaluation of the appearance of unstable regimes and their characterization (rotating stall and surge). It is based on a linearized approach using mean line calculations. The compressor is considered as a serie of vaned and vaneless spaces, and the corresponding equations are solved by use of Fourier series for time independent variables and by Laplace’s transform for time dependent variables. An analogy between the compressor’s response and a servo-mechanism is developed, using Nyquist’s diagram. Results are compared with experimental data which prove the validity of the approach. A parametric study indicates which parameters can be modified to improve the flow stability.

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