A new cruciform burner and its turbulence measurements for premixed turbulent combustion study

被引：40

作者：

Shy, SS ^{[1
]}

I, WK ^{[1
]}

Lin, ML ^{[1
]}

机构：

[1] Natl Cent Univ, Dept Mech Engn, Chungli 32054, Taiwan

来源：

EXPERIMENTAL THERMAL AND FLUID SCIENCE | 2000年 / 20卷 / 3-4期

关键词：

isotropic turbulence; counter-rotating fans and perforated plates; laser doppler velocimetry; turbulent intensities; Eulerian time correlation and spectrum;

D O I：

10.1016/S0894-1777(99)00035-7

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

A new turbulent flow system is proposed for the study of premixed turbulent combustion processes. This cruciform burner consists of two cylindrical vessels. The long vertical vessel can provide a stable downward propagating premixed-flame at one atmosphere. The horizontal vessel was equipped with a pair of motor-driven fans and perforated plates at each end. The fans can generate two intense counter-rotating large vortical streams with controllable fan frequency up to 7620 rpm. It was found that an approximately isotropic stationary turbulence with large turbulent intensities (greater than 450 cm/s) located in the core region between two perforated plates can be generated, as verified by extensive LDV measurements. In that mean velocities are nearly zero, turbulent intensities in all three directions are roughly equal, and the energy spectrum has a -5/3 slope, indicating that the turbulence has some properties of isotropic turbulence. Other parameters of interest, such as the autocorrelation, the integral length scale, and the experimental uncertainties are also reported for the first time. The present turbulence generator can be conveniently adopted for many experimental studies, such as gaseous premixed flames propagation and particle settling in nearly isotropic turbulence. (C) 2000 Elsevier Science Inc. All rights reserved.

引用

页码：105 / 114

页数：10

共 18 条

[1] TURBULENT BURNING VELOCITIES - A GENERAL CORRELATION IN TERMS OF STRAINING RATES [J].