进口导叶形式对核心机驱动风扇级的影响

Depending on the model of the core driven fan stage (CDFS) used by one variable cycle engine(VCE), the flow characteristic of CDFS was simulated under the real boundary environment, the influences of inlet guide vanes(IGV) on CDFS flowfield and performance were analyzed under single bypass (SB)/double bypass (DB) operating modes of VCE. Results showed that CDFS can achieve the wide range flow adjustment by changing the IGV prewhirl angle. When working in SB mode, the influences of variable inlet guide vane (VIGV) on the CDFS were almost the same with the conventional inlet guide vane (CIGV). In DB mode, obvious flow separation was induced on IGV suction surface with CIGV adopted for CDFS, and the flow capacity and the flow adjustment range of CDFS dropped rapidly. But for VIGV, it adjusted the flow through the flap, and kept the attack angle by the strut, meanwhile the link section of the strut and the flap can accelerate the flow, which can restrain the flow separation. VIGV is the desirable IGV type for CDFS, which can meet the performance parameters and flow adjustment requirements under different operating modes.