近期，我院研究生王宜军（一作）、教师范小军（通讯）等的研究成果“ Flow and heat transfer performance of asymmetric fluidic oscillators combined with double wall configuration for the gas turbine blade cooling”在《Applied Thermal Engineering》（IF=6.1）上发表。
论文简介如下：
Fluidic oscillators have garnered extensive attention due to their ability to sustain oscillations autonomously without external devices. This study established a double wall cooling configuration with asymmetric fluidic oscillators for gas turbine blade cooling. The k-ω turbulence model is applied to numerically solve the RANS equations. The research simulates oscillatory jets from both symmetric and asymmetric nozzles and examines the effects of variations in four critical geometric parameters: feedback channel width (D), length (H), outlet throat width (L), and outlet angle (A) on the flow and heat transfer performance of the nozzles. Results indicate that within the Reynolds number range of Re = 5000-10000, the oscillation frequency of symmetric nozzles increases linearly with Reynolds number, while the maximum deflection angle remains relatively stable, and the deflection angles on both sides are symmetric. In contrast, the oscillation frequency of asymmetric nozzles increases as the feedback channel width and length decrease, with a corresponding decrease in maximum deflection angle. In configurations where outlet width and angle are varied, although the oscillation frequency does not change with geometric parameters, the maximum deflection angle decreases with reductions in outlet width and angle, displaying asymmetry in the maximum deflection angles on either side. In terms of heat transfer performance, compared to symmetric nozzles, all asymmetric nozzles exhibit a significant asymmetry in the instantaneous Nusselt number distribution on the target surface throughout the cycle. Changes in feedback channel width, outlet width, and outlet angle lead to a notable increase in the time-averaged Nusselt number on the target surface. However, in configurations with altered feedback channel lengths, despite observed asymmetries in angles and an increase in frequency, the overall heat transfer performance does not exhibit significant changes.
Fig. 1.(a)Schematic of the cooling configuration in the actual internal cooling channels of the blades; (b)Detailed dimensions of the fluidic oscillator
