Scientific Library of Tomsk State University

   E-catalog        

Normal view MARC view

Mathematical investigation of pressure pulsations characteristics and natural acoustic frequencies in the gas-dynamic channel A. A. Glazunov, I. V. Eremin, K. V. Kostyushin [et al.]

Contributor(s): Eremin, Ivan V | Kostyushin, Kirill V | Zhiltsov, Konstantin N | Tyryshkin, Ilya M | Glazunov, Anatoly AMaterial type: ArticleArticleSubject(s): математическое исследование | автоколебания | однофазная сжимаемая среда | Навье-Стокса уравнения | турбулентностьGenre/Form: статьи в журналах Online resources: Click here to access online In: Journal of Physics: Conference Series Vol. 1145. P. 012036 (1-9)Abstract: Paper presents a numerical simulation of the occurrence of flow instability and pressure self-oscillations for a complex configuration of the gas-dynamic tract in combustion chamber. Unsteady axisymmetric two-dimensional Navier-Stokes equations are used for mathematical modelling of compressible one-phase medium. To simulate turbulence, the k-ε and LES models were used. Fast Fourier Transform (FFT) determined the frequency spectrum of pressure pulsations in the combustion chamber. It is shown that in the case of a simple geometry of the free gas cavity in combustion chamber, both models of turbulence make it possible to determine the spectrum of the natural acoustic frequencies. Using the LES model in the case of complex geometry makes it possible to predict the hydrodynamic structure of a flow accurately. The flow, in this case, has an intensive vortex generation. Formation of small-scale vortex occurs in the near-wall regions and large eddies in the core of a flow. Frequency of large eddies formation can be combined with the natural acoustic frequencies of combustion chamber and can affect the amplitude of pressure pulsations
Tags from this library: No tags from this library for this title. Log in to add tags.
No physical items for this record

Библиогр.: 17 назв.

Paper presents a numerical simulation of the occurrence of flow instability and pressure self-oscillations for a complex configuration of the gas-dynamic tract in combustion chamber. Unsteady axisymmetric two-dimensional Navier-Stokes equations are used for mathematical modelling of compressible one-phase medium. To simulate turbulence, the k-ε and LES models were used. Fast Fourier Transform (FFT) determined the frequency spectrum of pressure pulsations in the combustion chamber. It is shown that in the case of a simple geometry of the free gas cavity in combustion chamber, both models of turbulence make it possible to determine the spectrum of the natural acoustic frequencies. Using the LES model in the case of complex geometry makes it possible to predict the hydrodynamic structure of a flow accurately. The flow, in this case, has an intensive vortex generation. Formation of small-scale vortex occurs in the near-wall regions and large eddies in the core of a flow. Frequency of large eddies formation can be combined with the natural acoustic frequencies of combustion chamber and can affect the amplitude of pressure pulsations

There are no comments on this title.

to post a comment.
Share