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Analysis of possibilities of increasing a turbulence by throttled axisymmetric stream for a fluid flow inside closed duct

Judt W., Bartoszewicz J.

Journal of KONES

2018

Vol. 25, No. 1

185--190

Fluid flow through the closed duct is a common phenomenon, which is used in many technical applications. A stream of a fluid is often disturbed by different shapes of elements, which have an effect for a flow and causes the growth of a turbulence. Turbulence rising causes an increase of heat transfer process and eliminates areas of flow stagnation in thermal devices. Article presents methodology and results of research about possibilities of turbulence increasing for a fluid flow inside a closed duct. Authors analysed capabilities of application of an internal stream of a fluid in the axis of the tested duct, in the inlet to analysed construction for mainstream turbulence expanding. An additional stream of a fluid was added into the model by internal, partially throttled pipe, which was clogged by special disc. Contact between the disc and internal pipe generated a small gap, where an additional stream of a fluid was directed. Numerical analysis of a level of turbulence for a fluid flow through analysed duct was realized in ANSYS Fluent environment, as an unsteady simulation with Delayed Detached Eddy Dissipation model of turbulence. Experimental research was realized with constant anemometry measurement method. Results of experimental and numerical analysis show, what part of a fluid inside duct disturbed mainstream of a flow.