Flow instability control of an ultra-highly loaded transonic compressor rotor using self-excited casing bleed
نویسندگان
چکیده
Flow instability is a common issue encountered by high-speed compressors when they operate outside of their optimal range, especially in highly loaded compressors. This study investigates the potential an unsteady passive flow control technique, self-excited bleed (SEB), which involves casing modification, to improve base and stability characteristics ultra-highly low reaction transonic compressor rotor. Through transient computational fluid dynamics simulations, we demonstrate that SEB can extend rotor's operating range up 14.07%. The physical mechanism underlying this enhancement suppression shock-induced breakdown tip leakage vortex (TLV) near blade leading edge attenuation double SEB. excitation effect dominates eliminates spontaneous closed-loop feedback process based on dynamic interaction between TLV breakdown, secondary vortex, loading. Time-resolved tip-region patterns elucidate self-organization reconstruction mechanism. Frequency spectral analysis further reveals self-induced oscillation frequency formed during disappears, replaces it as main field. However, increasing rate causes boundary layer suction surface migrate radially outward, resulting increased blockage at rear passage. These two influences are quantified factor, determining requires trade-off beneficial detrimental impacts.
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ژورنال
عنوان ژورنال: Physics of Fluids
سال: 2023
ISSN: ['1527-2435', '1089-7666', '1070-6631']
DOI: https://doi.org/10.1063/5.0153541