High Frequency Premixed Flame Response to Acoustic Perturbations

2009 ◽  
Author(s):  
Shreekrishna Shreekrishna ◽  
Tim Lieuwen
Keyword(s):  
High Frequency ◽  
Premixed Flame ◽  
Flame Response

scholarly journals Flame response to high-frequency oscillations in a cryogenic oxygen/hydrogen rocket combustor

2019 ◽  
Author(s):  
N. Fdida ◽  
J. Hardi ◽  
H. Kawashima ◽  
B. Knapp ◽  
M. Oschwald ◽  
...  
Keyword(s):  
High Frequency ◽  
Acoustic Resonance ◽  
High Amplitude ◽  
Operating Conditions ◽  
Test Facility ◽  
Response Analysis ◽  
Rocket Engines ◽  
Acoustic Oscillations ◽  
Spatially Resolved ◽  
Flame Response

Experiments presented in this paper were conducted with the BKH rocket combustor at the European Research and Technology Test Facility P8, located at DLR Lampoldshausen. This combustor is dedicated to study the effects of high magnitude instabilities on oxygen/hydrogen flames, created by forcing high-frequency (HF) acoustic resonance of the combustion chamber. This work addresses the need for highly temporally and spatially resolved visualization data, in operating conditions representative of real rocket engines, to better understand the flame response to high amplitude acoustic oscillations. By combining ONERA and DLR materials and techniques, the optical setup of this experiment has been improved to enhance the existing database with more highly resolved OH* imaging to allow detailed response analysis of the flame. OH* imaging is complemented with simultaneous visible imaging and compared to each other here for their ability to capture flame dynamics.

Premixed flame response to equivalence ratio perturbations

2010 ◽  
Vol 14 (5) ◽  
pp. 681-714 ◽  
Author(s):  
Shreekrishna ◽  
Santosh Hemchandra ◽  
Tim Lieuwen
Keyword(s):  
Equivalence Ratio ◽  
Premixed Flame ◽  
Flame Response

Large-Eddy Simulation of Acoustic Flame Response to High-Frequency Transverse Excitations

AIAA Journal ◽  
2019 ◽  
Vol 57 (1) ◽  
pp. 327-340
Author(s):  
V. Sharifi ◽  
A. M. Kempf ◽  
C. Beck
Keyword(s):  
Large Eddy Simulation ◽  
High Frequency ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Flame Response

Premixed flame response to oscillatory pressure waves

2005 ◽  
Vol 30 (2) ◽  
pp. 1733-1740 ◽  
Author(s):  
O.J. Teerling ◽  
A.C. McIntosh ◽  
J. Brindley ◽  
V.H.Y. Tam
Keyword(s):  
Premixed Flame ◽  
Pressure Waves ◽  
Flame Response ◽  
Oscillatory Pressure

Effect of Nanosecond Repetitively Pulsed Discharges on the Dynamics of a Swirl-Stabilized Lean Premixed Flame

2013 ◽  
Author(s):  
D. A. Lacoste ◽  
J. P. Moeck ◽  
D. Durox ◽  
C. O. Laux ◽  
T. Schuller
Keyword(s):  
Transfer Function ◽  
Thermal Power ◽  
Premixed Flame ◽  
Plasma Discharges ◽  
Chemical Effects ◽  
Flame Dynamics ◽  
Lean Premixed ◽  
Flame Response ◽  
Order Of Magnitude ◽  
Pulsed Discharges

The effects of Nanosecond Repetitively Pulsed (NRP) plasma discharges on the dynamics of a swirl-stabilized lean premixed flame are investigated experimentally. Voltage pulses of 8-kV amplitude and 10-ns duration are applied at a repetition rate of 30 kHz. The average electric power deposited by the plasma is limited to 40 W, corresponding to less than 1 % of the thermal power of 4 kW released by the flame. The investigation is carried out with a dedicated experimental setup that allows for studies of the flame dynamics with applied plasma discharges. A loudspeaker is used to perturb the flame acoustically, and the discharges are generated between a central pin electrode and the rim of the injection tube. Velocity and CH* chemiluminescence signals are used to determine the flame transfer function assuming that plasma discharges do not affect the correlation between CH* emission and heat release rate fluctuations. Phase-locked images of the CH* emission were recorded to assess the effect of the plasma on the oscillation of the flame. The results show a strong influence of the NRP discharges on the flame response to acoustic perturbations, thus opening interesting perspectives for combustion control. An interpretation of the modifications observed in the transfer function of the flame is proposed by taking into account the thermal and chemical effects of the discharges. It is then demonstrated that by applying NRP discharges at unstable conditions, the oscillation amplitudes can be reduced by an order of magnitude, thus effectively stabilizing the system.

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