Experimental and Numerical Investigation of Impinging Jet Flow in Square Ducts Intersecting at 90 degrees.

Corson, D. ; Vassallo, P.

Technical Information Center Oak Ridge Tennessee

关键词: Decay;    Ducts;    Hydraulics;    Velocimeters;    Fermilab collider detector;   

RP-ID  :  DE2004822274

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

An experimental and numerical investigation has been conducted on flow through two square ducts with a 2:1 hydraulic diameter ratio joined at a right angle. Measurements of the velocity field were acquired using a laser Doppler velocimeter at various planar locations throughout the ducts at a nominal Reynolds number of 68,000. Pressure drop measurements were taken for 3 Reynolds numbers between 46,000 and 93,000. Computational fluid dynamics (CFD) analyses were performed using STAR-CD to determine how well the experimental data could be predicted using the k-(var-epsilon), k-(var-epsilon) RNG, k-(var-epsilon)Chen, k-(var-epsilon) quadratic, k-(omega), and Spalart-Allmaras models. The results show that there are distinct differences in the CDF results. The standard k-(var-epsilon) model overpredicted the loss coefficient by 4% and underpredicted the exit swirl magnitude by 43%. The best predictor of the swirl decay was found to be the k-(omega) model, which adequately followed the data throughout the entire geometry and underpredicted the exit swirl by 16%. The best overall model was found to be Spalart-Allmaras, which overpredicted the loss coefficient by 2% and underpredicted the exit swirl magnitude by 40%.