Active Control of Combustion Instability in a Liquid-Fueled Low-NOx Combustor

1999 ◽  
Vol 121 (2) ◽  
pp. 281-284 ◽  
Author(s):  
J. M. Cohen ◽  
N. M. Rey ◽  
C. A. Jacobson ◽  
T. J. Anderson
Keyword(s):  
Control System ◽  
Active Control ◽  
Combustion Instability ◽  
Pressure Fluctuations ◽  
Full Scale ◽  
Operating Conditions ◽  
Engine Fuel ◽  
Fuel Flow ◽  
Fuel Nozzle ◽  
Active Control System

A practical active control system for the mitigation of combustion instability has been designed and demonstrated in a lean, premixed, single-nozzle combustor at realistic engine operating conditions. A full-scale engine fuel nozzle was modified to incorporate a simple fuel flow actuator. Results indicate that the system was capable of reducing pressure fluctuations by 82 percent (15 dB or 5.6×) while maintaining or reducing NOx and CO emissions levels.

scholarly journals Active Control of Combustion Instability in a Liquid–Fueled Low–NOx Combustor

1998 ◽  
Author(s):  
Jeffrey M. Cohen ◽  
Nancy M. Rey ◽  
Clas A. Jacobson ◽  
Torger J. Anderson
Keyword(s):  
Control System ◽  
Active Control ◽  
Combustion Instability ◽  
Pressure Fluctuations ◽  
Full Scale ◽  
Operating Conditions ◽  
Engine Fuel ◽  
Fuel Flow ◽  
Fuel Nozzle ◽  
Active Control System

A practical active control system for the mitigation of combustion instability has been designed and demonstrated in a lean, premixed, single -nozzle combustor at realistic engine operating conditions. A full -scale engine fuel nozzle was modified to incorporate a simple fuel flow actuator. Results indicate that the system was capable of reducing pressure fluctuations by 82% (15 dB or 5.6X) while maintaining or reducing NOx and CO emissions levels.

scholarly journals Active Control of Combustion Instability in a Liquid–Fueled Sector Combustor

1999 ◽  
Author(s):  
J. R. Hibshman ◽  
J. M. Cohen ◽  
A. Banaszuk ◽  
T. J. Anderson ◽  
H. A. Alholm
Keyword(s):  
Active Control ◽  
Combustion Instability ◽  
Full Scale ◽  
Instability Mode ◽  
Combustion Instabilities ◽  
Fuel Flow ◽  
Lean Premixed

A system for the active control of combustion instabilities in liquid-fueled, lean, premixed combustors was demonstrated in a three-nozzle sector combustor, using full-scale engine hardware. Modulation of a portion of the premixed fuel flow led to a reduction of 6.5 dB (2.1X) in the amplitude of the dominant instability mode. Combustor emissions were not adversely affected by the control.

Design of active control system for combustion instability using H2 algorithm

2007 ◽  
Vol 43 (1/2/3/4) ◽  
pp. 322
Author(s):  
Hiroyuki Sato ◽  
Chiaki Nishidome ◽  
Itsuro Kajiwara ◽  
A. Koichi Hayashi
Keyword(s):  
Control System ◽  
Active Control ◽  
Combustion Instability ◽  
Active Control System

scholarly journals Passat: A Cubesat Student Design Project For Active Control System Development And Verification

2020 ◽  
Author(s):  
Daniel Rooney ◽  
Mathew Roseman ◽  
Charles Shotridge ◽  
Jeffrey Aschenbrenner ◽  
Sanjay Jayaram
Keyword(s):  
Control System ◽  
Active Control ◽  
System Development ◽  
Design Project ◽  
Active Control System

APPLICATION OF ELASTIC DEFORMATIONS TO PARABOLOIDAL SURFACE MAKING

2020 ◽  
Vol 3 ◽  
pp. 11-19
Author(s):  
A.V. NEMENKO ◽  
M.M. NIKITIN
Keyword(s):  
Control System ◽  
Active Control ◽  
Material Removal ◽  
Spherical Surface ◽  
Parabolic Mirror ◽  
Concave Mirror ◽  
Elastic Deformations ◽  
Elastic Bending ◽  
Active Control System ◽  
The Given

The transformation of a spherical concave mirror into a parabolic one with the help of elastic bending deformations is considered. The magnitude and direction of the load, which creates the necessary bend for transforming the mirror with the given parameters, are determined. Uneven material removal during machining is replaced by the bend of an optically accurate spherical surface already obtained. The application of the results to the creation of an active control system for the shaping of the surface of a paraboloid of rotation is considered. The proposed finishing technology is aimed at solving the problem of guaranteed obtaining optically accurate surface of a parabolic mirror.

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