![]() ![]() Numerical methodologies (Section 2.2) for flow and heat transfer modeling in the rotor-stator systems encompass methods of the direct numerical simulation (DNS), Reynolds-averaged Navier–Stokes equations (RANS) with the turbulence models both in the general-purpose form as incorporated in the commercial computational fluid dynamics (CFD) software, and often specially modified to be used in the rotating-disk systems. Methodologies (Section 2) elucidate experimental techniques most widely used for measurements in rotating-disk systems of (a) heat/mass transfer (Section 2.1.1), such as naphthalene sublimation techniques, steady-state (thin layer) and transient (thermochromic liquid crystals) thermal measurements, thermocouples and infra-red cameras, and (b) flow structure using hot-wire anemometry, laser Doppler and particle image velocimetry, as well as by means of a laser plane and smoke generator (Section 2.1.2). The structure of the review comprises two main parts, namely, methodology and geometries/results. The review focuses on convective heat transfer in predominantly outward air flow in rotor-stator cavities with and without impinging jets. Different strategies are employed by designer depending on the particular engineering application.Ī review of the most important results for the rotor-stator systems available so far is presented here. Reliable methods for estimation convective heat transfer intensity in the air gap can help manufacturers to better design the discoidal wind generators to prevent overheating. Discoidal rotor-stator systems do not incorporate gears in order to avoid altering the system's mechanical efficiency, and are thus able to improve power production at low rotational speeds. Another important example from the modern practice has relevance to wind generators. Conclusions to the review outline perspectives of the further extension of the investigations of different kinds of the rotor-stator systems and their applications in engineering practice.įluid flow and convective heat transfer in rotor-stator configuration are of great importance in engineering practice in the turbomachinery industry, namely, in the gas turbine cooling. Geometries and results part being mentioned starting from simple to complex elucidates cases of a free rotating disk, a single disk in the crossflow, single jets impinging onto stationary and rotating disk, rotor-stator systems without and with impinging single jets, as well as multiple jets. Theoretical approaches incorporate modern CFD computational tools (DNS, LES, RANS etc). Experimental methodologies include naphthalene sublimation techniques, steady-state (thin layer) and transient (thermochromic liquid crystals) thermal measurements, thermocouples and infra-red cameras, hot-wire anemometry, laser Doppler and particle image velocimetry, laser plane and smoke generator. The review focuses on convective heat transfer in predominantly outward air flow in the rotor-stator geometries with and without impinging jets and incorporates two main parts, namely, experimental/theoretical methodologies and geometries/results. Fluid flow and convective heat transfer in rotor-stator configurations, which are of great importance in different engineering applications, are treated in details in this review. ![]()
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