| Citation: | Fang Tongyi, Zhang Bo, Li Qi, et al. Research on effect of inlet bend on aerodynamic excitation force in centrifugal compressor based on nonlinear harmonic method[J]. Journal of Aerospace Power, 2026, 42（X）：20250371 doi: 10.13224/j.cnki.jasp.20250371
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The impact of inlet bends on the aerodynamic excitation forces in a centrifugal compressor was investigated using the nonlinear harmonic method. Numerical simulations were conducted to analyze the coupling effects between flow distortions induced by the bend and the geometric non-uniformity of the volute. The results showed that when the installation angle of the bend aligned with the 0-section of the volute, the bend inlet significantly amplified the first-order fluctuating pressure on the blade surface (with a maximum increase of 77%) but suppressed the second-order excitation force (amplitude reduction of 27%). High-amplitude excitation regions were concentrated near the leading edge of the main and splitter blades at the tip. Flow condition analysis revealed that under low-flow conditions, the bend increased the first-order fluctuating pressure amplitude by up to 78%, while under high-flow conditions, transonic flow shifted the high-amplitude excitation region toward the downstream part of the blade. Additionally, the bend's disturbance to the suction side near the leading edge of the blade tip was significantly enhanced (an increase of 800%). Mechanism analysis indicated that the synergistic effect of the bend and volute influenced the excitation forces through circumferential pressure distortion and disturbance phase interference, while the Mach number variation (subsonic/transonic) determined the disturbance propagation path and coupling intensity. Furthermore, the installation angle of the bend had a significant impact on the order characteristics of excitation forces. The blade inlet region was most sensitive to changes in the installation angle, and as the flow developed downstream, the potential flow effect of the volute gradually diminished the influence of the bend.
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