Influence of unsteady wake on a turbulent separation bubble

被引：6

作者：

Chun, S ^{[1
]}

Sung, HJ ^{[1
]}

机构：

[1] Korea Adv Inst Sci & Technol, Dept Mech Engn, Yusong Ku, Taejon 305701, South Korea

来源：

EXPERIMENTS IN FLUIDS | 2002年 / 32卷 / 02期

关键词：

wake generator; unsteady wake; separation bubble;

D O I：

10.1007/s003480100357

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

An experimental study was made of turbulent separated and reattaching flow over a blunt body, where unsteady wake was generated by a spoked-wheel type of wake generator with cylindrical rods. The influence of unsteady wake was scrutinized by altering the rotation direction (clockwise and counter-clockwise) and the normalized passing frequency (0 less than or equal to St(H) less than or equal to 0.20). The Reynolds number based on the cylindrical rod was Re-d = 375. A phase-averaging technique was employed to characterize the unsteady wake. The effect of different rotation directions, which gave a significant reduction of x(R), was examined in detail. The wall pressure fluctuations on the blunt body were analyzed in terms of the spectrum and the coherence.

引用

页码：269 / 279

页数：11

共 18 条

[1] MODIFICATION OF VORTEX INTERACTIONS IN A REATTACHING SEPARATED FLOW [J].

BHATTACHARJEE, S ;

SCHEELKE, B ;

TROUTT, TR .

AIAA JOURNAL, 1986, 24 (04) :623-629

[2]

BREDERODE VD, 1978, J FLUID ENG-T ASME, V100, P91

[3]

Chun KB, 1996, EXP FLUIDS, V21, P417, DOI 10.1007/BF00189044

[4] A REVIEW OF RESEARCH ON SUBSONIC TURBULENT-FLOW REATTACHMENT [J].

EATON, JK ;

JOHNSTON, JP .

AIAA JOURNAL, 1981, 19 (09) :1093-1100

[5] Unsteady boundary layers on a flat plate disturbed by periodic wakes .1. Measurement of wake-affected heat transfer and wake-induced transition model [J].

Funazaki, K .

JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME, 1996, 118 (02) :327-336

[6] Unsteady boundary layers on a flat plate disturbed by periodic wakes .2. Measurements of unsteady boundary layers and discussion [J].

Funazaki, K .

JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME, 1996, 118 (02) :337-344

[7] INFLUENCE OF UNSTEADY WAKE ON HEAT-TRANSFER COEFFICIENT FROM A GAS-TURBINE BLADE [J].

HAN, JC ;

ZHANG, L ;

OU, S .

JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME, 1993, 115 (04) :904-911

[8] An experimental study of large-scale vortices over a blunt-faced flat plate in pulsating flow [J].

Hwang, KS ;

Sung, HJ ;

Hyun, JM .

EXPERIMENTS IN FLUIDS, 2001, 30 (02) :202-213

[9] STRUCTURE OF A TURBULENT SEPARATION BUBBLE [J].

KIYA, M ;

SASAKI, K .

JOURNAL OF FLUID MECHANICS, 1983, 137 (DEC) :83-113

[10] Characteristics of wall pressure fluctuations in separated and reattaching flows over a backward-facing step: Part I. Time-mean statistics and cross-spectral analyses [J].

Lee, I ;

Sung, HJ .

EXPERIMENTS IN FLUIDS, 2001, 30 (03) :262-272

← 1 2 →