Analysis of Triple Flame Features under Acoustic Oscillations by using a Deep Auto-Encoder

Saito, Masanori; Motohashi, Kazunori; Iezumi, Tetsuo; Tanabe, Mitsuaki

doi:10.2514/6.2019-2013

Cited by 1 publication

(3 citation statements)

References 13 publications

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“…Equation (13) shows that the Rayleigh Index distribution of the orthogonal modes is able to be obtained. It is possible to obtain a limited number of orthogonal modes using this method.…”

Section: Employed Neural Networkmentioning

confidence: 99%

“…Figure 7 shows the spatial distributions of the Rayleigh Index obtained from the component of Eq. (13). A positive Rayleigh Index indicates pumping, which supplies energy to the combustion oscillation.…”

Section: Rayleigh Index Of Each Modementioning

confidence: 99%

“…Recently, Deep Neural Network (DNN) functioning nonlinear transformations has been utilized widely in research fields. [11][12][13][14] Tanabe showed that the operation of dimension reduction using POD could be implemented in DNN. A method of mode decomposition using Deep Auto-Encoder (DAE) was also proposed.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Study on Nonlinear Dynamics Using the State Space of Combustion Oscillation in a Rocket Combustor

ARAI,

IEMURA,

SAITO

et al. 2023

Trans. Japan Soc. Aero. S Sci.

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Combustion oscillation in a rocket combustor was analyzed using a Variational Auto-Encoder (VAE). Dimension reductions were conducted on various physical quantities ( pA, _ q 0 , etc.) in the combustor. Orthogonal modes were obtained using proper orthogonal decomposition for the output of VAE. Pumping and damping regions in the combustor were identified using the distribution of the Rayleigh Index for each mode. Three characteristic modes were identified that supply energy to the oscillation. A phase plane was spanned by the latent variables obtained by the reductions. Activation of each of the characteristic six modes was mapped on the plane. The three characteristic modes were found to be activated at different phases. From the trajectory of the oscillation on the plane, the plane was confirmed to satisfy the requirements to be a state space. In the high-pressure amplitude phase, the pumping regions near the combustor wall were clarified.

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“…Equation (13) shows that the Rayleigh Index distribution of the orthogonal modes is able to be obtained. It is possible to obtain a limited number of orthogonal modes using this method.…”

Section: Employed Neural Networkmentioning

confidence: 99%

Section: Rayleigh Index Of Each Modementioning

confidence: 99%