Abstract
Influence for a nondisturbed stream by cross-flow is present in many technical applications. In part of applications, this phenomenon is caused intentionally, but in others, it is a side-effect. Flow through the closed duct is one of the most frequently realized types of flow in thermal devices. The paper shows an influence of cross-flow for a laminar stream, which is flowing through closed, round duct. The considered case was calculated in numerical calculations and analyzed during experimental research. Cross-flow stream was generated by four circular nozzles located on the duct walls in some distance from the duct inlet, which was distributed along the circumference of analyzed construction in the right angle to the mainstream. Experimental research was realized by a constant temperature anemometry measurement method. A numerical model of a fluid flow was created in ANSYS Fluent software. Unsteady numerical calculations of a cross-flow influence for a mainstream was realized with the Detached Delayed Eddy Dissipation model of turbulence application. Realized research established how a cross stream can turbulent a laminar flow in a closed, circular duct. Authors showed velocity distribution in the main duct after cross-flow influence and demonstrated, that this method allows ascending turbulence of a flow in external parts of fluid flow.
Highlights
Fluid flow through a closed duct is commonly used during work of different types of technical devices
This stage of calculation was realized with a Delayed Detached Eddy Simulation (DDES) model of turbulence
Realized experimental and numerical analysis confirmed the possibility of turbulence increasing in a flow by a cross-flow stream
Summary
Fluid flow through a closed duct is commonly used during work of different types of technical devices. They can be used for a fluid transportation. This type of a flow is present in combustion engines, because of the wide application of closed circular ducts or circular chambers in this type of technical devices [1]. The paper presents results of a research connected with a fluid flow inside a closed circular duct. The main stream of a fluid was disturbed by a cross-flow This specific type of a flow is present in different applications. Influence of a cross flow on the main stream is present for a delivering air into combustion. Authors analyzed what quantity of additional cross-flow can increase fluctuations inside the main flow and what is an area of influence
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