Vela, Iris; Kuhr, Christian; Schönbucher, Axel:
Scale Adaptive Simulation (SAS) der Wärmestrahlung und der Rußkonzentrationen in einem turbulenten JP-8-Poolfeuer
In: Chemie - Ingenieur - Technik (CIT), Jg. 78 (2006), Heft 8, S. 1255 - 1256
2006Artikel/Aufsatz in ZeitschriftOpen Access
ChemieFakultät für Chemie » Technische Chemie
Damit verbunden: 1 Publikation(en)
Titel in Deutsch:
Scale Adaptive Simulation (SAS) der Wärmestrahlung und der Rußkonzentrationen in einem turbulenten JP-8-Poolfeuer
Titel in Englisch (übersetzt):
Scale adaptive simulation (SAS) of the heat radiation and soot concentrations in a turbulent JP-8 pool fire
Autor*in:
Vela, Iris;Kuhr, ChristianUDE
LSF ID
11315
Sonstiges
der Hochschule zugeordnete*r Autor*in
;
Schönbucher, AxelUDE
LSF ID
11305
Sonstiges
der Hochschule zugeordnete*r Autor*in
Erscheinungsjahr:
2006
Open Access?:
Open Access
Scopus ID
Sprache des Textes:
Deutsch

Abstract in Englisch:

A computational fluid dynamics (CFD) simulation of a JP-8 pool fire (16m diameter) was made. The discussion covers the calculation of the specific radiation SEP, radiation density L, radiation strength E, and soot mass fraction. The commercial program package ANSYS CFX was used as simulation tool. The non structured Hexaeder screen in the simulation field of 60 m × 60 m × 80 m has 800,000 cells. The flow field of flame and environment at 1 atm conditions has a fuel source (JP-8) with constant mass burning rate. SAS is based on a combination of the RANS equations, which is here at the pool edge and the Large-Eddy-Simulation (LES) in the rest of the flow field. The laminar flamelet model with 112 species and 800 reactions is used, the Lindstedt soot model to calculate the soot mass fraction, and the Monte Carlo model to describe the heat radiation. The heat radiation of the pool fire was calculated with use of a stage function that from the modified absorption coefficients depends on coherent structures such as reaction zones, hot spots, and soot balls. It is indicated that the turbulence in a large pool fire influences heat radiation, soot mass fraction, and soot blockade effect that the average specific radiation SEP reduces. The momentary flame temperatures and heat radiation depend on the dynamic behavior of the coherent structures. The average radiation strength of the JP-8 pool fire contributes to the pool rim E = 40 kw/sq m. The area of SEP is between 6 kw/sq m ≤SEP ≤430 kw/sq m and is caused by the statistical behavior of hot spots and soot balls. The soot mass fraction correlates with the surface fractions of soot balls and heat radiation from the fire. The CFP simulations are validated by the use of IR thermographic measurements. Diagram.