期刊
JSME INTERNATIONAL JOURNAL SERIES B-FLUIDS AND THERMAL ENGINEERING
卷 49, 期 4, 页码 980-987出版社
JAPAN SOC MECHANICAL ENGINEERS
DOI: 10.1299/jsmeb.49.980
关键词
flow control; fluid transients; internal flow; oscillating flow; pipe flow; pulsation; transition; turbulent flow and unsteady flow
Investigations of time-dependent laminar and transitional flows need accurate and rep producible generation of the flow as a function of time. For this purpose, an electronically controlled air valve, with which the mass flow rate is controlled, was designed and built. The working principle and lay-out of the valve are explained and the performance of the valve is demonstrated. It was found that with the present equipment one can study any non-periodic and periodic flow and the flow can be adjusted to be laminar, transitional and turbulent. The investigations on laminar and transitional time-dependent flows are reported. Laminar flow investigations showed that the generated sinusoidal mass flow rates agree well with that of analytical solution. Non-periodic transient and periodic sinusoidal pulsatile transitional flows were investigated. It was shown that elucidation of the transition in non-periodic transient flows may help in understanding the transition in periodic flows.
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