Zobrazeno 1 - 10
of 229
pro vyhledávání: '"Wolfgang Polifke"'
Autor:
Thomas Steinbacher, Wolfgang Polifke
Publikováno v:
Fluids, Vol 7, Iss 2, p 61 (2022)
Convective velocity perturbations (CVPs) are known to play an important role in the response of flames to acoustic perturbations and in thermoacoustic combustion instabilities. In order to elucidate the flow-physical origin of CVPs, the present study
Externí odkaz:
https://doaj.org/article/a74cf309c17047bbaf1ae38e620a3a39
Publikováno v:
Meteorologische Zeitschrift, Vol 23, Iss 4, Pp 369-385 (2014)
The Quadrature Method of Moments (QMoM) is applied to a one-dimensional test case for sedimentation of raindrops. Comparison of the results with a reference spectral method exhibits discrepancies (“step patterns”) that must be considered as model
Externí odkaz:
https://doaj.org/article/7aa4b02c2a14406997a64407820a2676
Publikováno v:
Meteorologische Zeitschrift, Vol 23, Iss 4, Pp 411-423 (2014)
In numerical weather prediction models, parameterisations are used as an alternative to spectral modelling. One type of parameterisations are the so-called methods of moments. In the present study, two different methods of moments, a presumed-number-
Externí odkaz:
https://doaj.org/article/8d22d85d6e6d4c30ab2d1a4542413be0
Publikováno v:
Journal of Fluid Science and Technology, Vol 4, Iss 2, Pp 379-390 (2009)
A method for LES of ternary mixing in turbulent flows is presented and partly validated against DNS data. The subgrid-scale mixing state is characterized by joint presumed discrete distributions, i.e. discrete ensembles which approximate multivariate
Externí odkaz:
https://doaj.org/article/9f41e80974cc416ca6cf2759a8a8c39e
Autor:
Rohit Kulkarni, Wolfgang Polifke
Publikováno v:
Journal of Combustion, Vol 2012 (2012)
The potential of a progress variable formulation for predicting autoignition and subsequent kernel development in a nonpremixed jet flame is explored in the LES (Large Eddy Simulation) context. The chemistry is tabulated as a function of mixture frac
Externí odkaz:
https://doaj.org/article/25ab1d8c656c4ead980a943392366f8d
Publikováno v:
International Journal of Spray and Combustion Dynamics. 15:16-32
The present work compares the respective advantages and disadvantages of compressible and incompressible computational fluid dynamics (CFD) formulations when used for the estimation of the acoustic flame response. The flame transfer function of a tur
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4522a544efb2459781a7aa0832cdaa6c
https://doi.org/10.1177/17568277231154204
https://doi.org/10.1177/17568277231154204
Publikováno v:
Combustion Theory and Modelling. :1-21
This study presents a numerical analysis of the impact of hydrogen addition on the consumption speed of premixed lean methane-air laminar flames exposed to combined strain and heat loss. Equivalence ratios of 0.9, 0.7, and 0.5 with fuel mixture compo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6b7d5e8f7aee8c11f19a500441a64d47
https://doi.org/10.1080/13647830.2023.2182235
https://doi.org/10.1080/13647830.2023.2182235
Autor:
Edoardo Scoletta, Wolfgang Polifke
Publikováno v:
INTER-NOISE and NOISE-CON Congress and Conference Proceedings. 265:6277-6285
Flame transfer functions (FTF) of laminar premixed flames acoustically forced are analytically investigated and modelled. The study is based on the linearized G-equation, which is used to kinematically track the flame front. In order to incorporate c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a7744294c9e6e61cd1b143a364f725b5
https://doi.org/10.3397/in_2022_0933
https://doi.org/10.3397/in_2022_0933
Publikováno v:
INTER-NOISE and NOISE-CON Congress and Conference Proceedings. 265:6199-6207
Neural network models, thanks to their flexibility and ability to approximate any function, are gaining popularity across all research fields. In thermoacoustics, one of their applications is modelling of a nonlinear flame response, learned from a si
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c40f8112c030fb5024935c52c028625e
https://doi.org/10.3397/in_2022_0921
https://doi.org/10.3397/in_2022_0921
Publikováno v:
International Journal of Spray and Combustion Dynamics. 14:107-117
A theoretical investigation of the effect of gas velocity oscillations on droplet number density and evaporation rate is presented. Oscillations in gas velocity cause a number density wave, i.e. an inhomogeneous, unsteady variation of droplet concent
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3104914adddafe91339450a2f729eb9e
https://doi.org/10.1177/17568277221085957
https://doi.org/10.1177/17568277221085957