PERIODICALLY OSCILLATING TURBULENT FLOWS IN THE ENTRANCE REGION OF A CURVED RECTANGULAR DUCT

被引：0

作者：

KITA, Y

KUROU, R

HIROSE, K

NAKANO, A

机构：

[1] SECOM CO LTD,TOKYO 163,JAPAN

[2] MITSUBISHI ELECTR CO,AMAGASAKI,HYOGO 661,JAPAN

来源：

JSME INTERNATIONAL JOURNAL SERIES II-FLUIDS ENGINEERING HEAT TRANSFER POWER COMBUSTION THERMOPHYSICAL PROPERTIES | 1990年 / 33卷 / 02期

关键词：

Boundary Layer - Curved Rectangular Duct - Periodically Oscillating Turbulent Flows - Unsteady Flow;

D O I：

10.1299/jsmeb1988.33.2_186

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Fluctuation of the boundary layer grown on the end plate of a curved duct is studied experimentally for two inlet flow conditions: uniform flow which fluctuates sinusoidally in magnitude and flow which always has a fully developed duct flow profile but which fluctuates in magnitude. For both cases, the cross-sectional mean velocity, Um, fluctuates with the Womersley number of 44.3, the ratio of the amplitude of Um to its time mean value, Ūm, is 0.38, and the Dean number based on Ūm is 1.28 × 104. It is found that (1) at the cross section of the duct turning angle of 60°, the fluctuation of the momentum thickness of main flow velocity, Uφ, is very much different with the two inlet conditions, and (2) the distribution of Uφ shows very good agreement with the 1/n power law but flow fluctuation has a great effect on the distribution of the cross-flow velocity component, Ur, very close to the wall.

引用

页码：186 / 192

页数：7