Effect of swirl on lifted flame characteristics in nonpremixed jets

被引：11

作者：

Cha, MS ^{[1
]}

Lee, DS ^{[1
]}

Chung, SH ^{[1
]}

机构：

[1] Seoul Natl Univ, Dept Mech Engn, Seoul 151742, South Korea

来源：

COMBUSTION AND FLAME | 1999年 / 117卷 / 03期

关键词：

D O I：

10.1016/S0010-2180(98)00114-X

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The effect of swirl on lifted flames in a nonpremixed jet has been studied experimentally by rotating a nozzle to generate a continuous swirl. A model for turbulent Lifted flames, based on turbulent large scale structure, is extended to account for the effect of swirl in the prediction of lift-off heights. Results show that the lift-off height decreases linearly with nozzle rotational speed in turbulent jets. The model for swirl jets predicts that a normalized lift-off height depends solely on swirl number, and experimental results substantiate this prediction. For laminar jets, the lift-off height shows a nonlinear dependence on nozzle rotational speed and becomes independent of jet velocity as the swirl number increases. These characteristics are attributed to the jet breakup behavior in swirl jets. (C) 1999 by The Combustion Institute.

引用

页码：636 / 645

页数：10

共 24 条

[1]

BEER J, 1983, COMBUSTION AERODYNAM, P117

[2]

BRADLEY D, 1990, 23 S INT COMB COMB I, P685

[3]

BROADWELL JE, 1986, 20 S INT COMB COMB I, P303

[4] Characteristics of lifted flames in nonpremixed turbulent confined jets [J].

Cha, MS ;

Chung, SH .

TWENTY-SIXTH SYMPOSIUM (INTERNATIONAL) ON COMBUSTION, VOLS 1 AND 2, 1996, :121-128

[5]

CHEN RK, 1988, 22 S INT COMB COMB I, P536

[6]

CHIGIER NA, 1975, 15TH S INT COMB PITT, P573

[7] ON THE CHARACTERISTICS OF LAMINAR LIFTED FLAMES IN A NONPREMIXED JET [J].

CHUNG, SH ;

LEE, BJ .

COMBUSTION AND FLAME, 1991, 86 (1-2) :62-72

[8]

DAHM WJA, 1988, 22ND S INT COMB, P801

[9]

EICKHOFF H, 1986, 20 S INT COMB, P311

[10] ENHANCEMENT OF FLAME BLOWOUT LIMITS BY THE USE OF SWIRL [J].

FEIKEMA, D ;

CHEN, RH ;

DRISCOLL, JF .

COMBUSTION AND FLAME, 1990, 80 (02) :183-195

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