Abstract
Annular gas seals are critical components in turbomachines for restricting leakage and ensuring efficiency. However, their sealing performance is significantly affected by the kinetic energy carry-over (KEC) effect. In this paper, a novel concept of the fluidic oscillator seal (FOS) is proposed. The self-oscillating flow pattern inside FOS controls the undesired KEC effect, thus enhancing the sealing performance. The effectiveness of FOS is evaluated by comparing with the cutting-edge air curtain technology (ACT). Comparison results show that FOS exhibits superior sealing performance under all the studied operation conditions. Its superiority becomes more prominent as the seal clearance and teeth number increase. The maximum discharge coefficient reduction ratio reaches up to 51.4%, over 4 times larger than ACT. Moreover, the FOS requires only about half the installation space for an equivalent leakage flow rate compared to the ACT.
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