Heat transfer and pressure losses have been studied in a cyclone-jet chamber to evaluate its the thermal efficiency and thermal-hydraulic performance. The cyclone chamber simulates the leading edge area, it is 4.2 mm in diameter and 35 mm long and has four injecting and five discharging round-shaped holes evenly spread and facing the chamber stagnation point. Such a configuration generates a quasi two-dimensional swirl flow pattern accompanied with flow separation effects. Three test sections with various inlet and outlet hole diameter have been studied to evaluate the effect of boundary conditions. The Heating in Melted Metal (HMM) experimental technique has been employed to measure heat transfer parameters.

The local spanwise heat flux distribution has a periodical characteristic with a maximum opposite the injecting holes and a minimum in between them. The non-uniformity of the heat flux depends on the diameter of inlet holes and the air mass flow rate. The angular distribution of an averaged spanwise heat transfer is asymmetrical with respect to the chamber stagnation point; it is either actually a ‘flat curve’ or has a maximum at the stagnation point. An average heat transfer in the cyclone chamber is 2.61 – 3.54 higher compared with its axial counterpart. The basic heat transfer correlations are presented in addition to the thermal efficiency and thermal-hydraulic performance evaluation made. The proposed cyclone-jet design is as good as a serpentine cyclone cooling and some advanced cooling techniques, but more simple production technology is an undoubted advantage of this configuration.

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