Low-order models for low-frequency combustion instability in hybrid rocket engines

2020 ◽  
Author(s):  
Andrea Ferrero ◽  
Filippo Masseni ◽  
Dario Pastrone
Keyword(s):  
Combustion Instability ◽  
Low Frequency ◽  
Rocket Engines ◽  
Hybrid Rocket ◽  
Low Order

scholarly journals Low-Frequency Feed-System-Coupled Combustion Instability in Hybrid Rocket Motors

2013 ◽  
Vol 8 (2) ◽  
pp. 380-394 ◽  
Author(s):  
Takakazu MORITA ◽  
Saburo YUASA ◽  
Koki KITAGAWA ◽  
Toru SHIMADA ◽  
Shigeru YAMAGUCHI
Keyword(s):  
Combustion Instability ◽  
Low Frequency ◽  
Hybrid Rocket ◽  
Feed System ◽  
Rocket Motors

scholarly journals Mixed acoustic–entropy combustion instabilities in gas turbines

2014 ◽  
Vol 749 ◽  
pp. 542-576 ◽  
Author(s):  
Emmanuel Motheau ◽  
Franck Nicoud ◽  
Thierry Poinsot
Keyword(s):  
Gas Turbines ◽  
Transfer Functions ◽  
Combustion Instability ◽  
Low Frequency ◽  
Acoustic Mode ◽  
Dynamic Mode Decomposition ◽  
Dynamic Mode ◽  
Reacting Flow ◽  
Exit Nozzle ◽  
Low Order

AbstractA combustion instability in a combustor terminated by a nozzle is analysed and modelled based on a low-order Helmholtz solver. A large eddy simulation (LES) of the corresponding turbulent, compressible and reacting flow is first performed and analysed based on dynamic mode decomposition (DMD). The mode with the highest amplitude shares the same frequency of oscillation as the experiment (approximately 320 Hz) and shows the presence of large entropy spots generated within the combustion chamber and convected down to the exit nozzle. The lowest purely acoustic mode being in the range 700–750 Hz, it is postulated that the instability observed around 320 Hz stems from a mixed entropy–acoustic mode, where the acoustic generation associated with entropy spots being convected throughout the choked nozzle plays a key role. The DMD analysis allows one to extract from the LES results a low-order model that confirms that the mechanism of the low-frequency combustion instability indeed involves both acoustic and convected entropy waves. The delayed entropy coupled boundary condition (DECBC) (Motheau, Selle & Nicoud, J. Sound Vib., vol. 333, 2014, pp. 246–262) is implemented into a numerical Helmholtz solver where the baseline flow is assumed at rest. When fed with appropriate transfer functions to model the entropy generation and convection from the flame to the exit, the Helmholtz/DECBC solver predicts the presence of an unstable mode around 320 Hz, in agreement with both LES and experiments.

Optimal propellant control in hybrid rocket engines

1995 ◽  
Author(s):  
Guido Colasurdo ◽  
Dario Pastrone ◽  
Lorenzo Casalino
Keyword(s):  
Rocket Engines ◽  
Hybrid Rocket
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