نتایج جستجو برای: turbulent reacting flow
تعداد نتایج: 508371 فیلتر نتایج به سال:
The purpose of this contribution is to present some examples for the use of recent data processing and visualization techniques for the study of unsteady vortical flows. The basic idea is to extract vortices, shear layers and data defining their current state from DNS data and to track their evolution in time. Some apparent signatures which help to get additional insight into the flow dynamics ...
The design challenge of reliable lean combustors needed to decrease pollutant emissions has clearly progressed with the common use experiments as well large eddy simulation (LES) because its ability predict interactions between turbulent flows, sprays, acoustics, and flames. However, accuracy such numerical predictions depends very often on user's experience choose most appropriate flow modelin...
We discuss recent developments in the application of high-order adaptive mesh refinement constructions in reacting flow computations. We present results pertaining to the time integration of coupled diffusive-convective terms in this context using a stabilized explicit Runge-Kutta-Chebyshev scheme. We also discuss chemical model reduction strategies, with a focus on the utilization of computati...
Thermoacoustic instability in premixed combustors occurs occasionally at multiple frequencies, especially in configurations where flames are stabilized on separating shear layers that form downstream of sudden expansions or bluff bodies. While some of these frequencies are related to the acoustic field, others appear to be related to shear flow instability phenomena. It is shown in this paper t...
Understanding the cross-scale kinetic energy transport in turbulent flames is critical for physically-accurate modeling. This paper presents an experimental analysis of premixed swirl at Karlovitz numbers between 10 and 20 via physical space filtering. High-resolution tomographic particle image velocimetry formaldehyde planar laser induced fluorescence measurements are used to obtain 3D velocit...
The aim of this work is the parallel solution of large 3D-CFD problems concerning the numerical description of turbulent combustion and pollutant formation processes in coal-fired utility boilers. The in-house developed multi-domain CFD code AIOLOS for quasi-stationary, weakly compressible, turbulent reacting flows is used. The code is based on a conservative finite-volume formulation with a co...
Emission regulations for diesel engines are being strengthened and it is impossible to meet the standards without exhaust after-treatment systems. Lack of the space in many diesel vehicles, however, make it difficult to design and install stand-alone catalytic converters such as DOC, DPF, and SCR in the vehicle exhaust systems. Accordingly, those have been installed inside the muffler to save t...
In this study, various numerical schemes for transient simulations of 2D laminar reacting gas flows, as typically found in chemical vapor deposition reactors, are proposed and compared. These systems are generally modeled by means of many stiffly coupled elementary gas phase reactions between a large number of reactants and intermediate species. The purpose of this study is to develop robust an...
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