Abstract
Pulsed endwall air injection (PEAI) is an effective method to eliminate flow separation and improve blade loading of compressor. Most studies on PEAI have focused on improving the aerodynamic performance of compressor, and few studies investigated the influence on the flow field in detail, especially vortex structure in compressors. Aiming at revealing the effect mechanism of PEAI on flow separation and vortex structure, unsteady numerical study is carried out. The effect of PEAI parameters (frequency and amplitude) on flow field of compressor cascade is addressed. Results show that cascade loss coefficient and endwall loss coefficient of cascade are respectively reduced 13.92% and 28.24% under the optimal PEAI scheme. Higher injection amplitude leads to more decrease of corner separation and deterioration of flow field at mid-span, and double concentration shedding vortex (CSV) structure is found when injection amplitude is 1.40. As the injection frequency increasing, the regular injection leads to a series of “injection vortexes” distributing with equal interval, which suppress CSV and PV. Keywords: axial flow compressor, corner separation, flow control, pulsed endwall air injection, vortex structure
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