• Air blowing in the transition region (Scheme 1) at 0.1U achieves optimal noise reduction of 1.53 dB(A) by suppressing wake vortices.
• Air blowing in the side edge area (Scheme 2) is effective across a wide speed range (0.1U–0.5U) for noise mitigation.
• Air sucking is less effective than blowing, with noise reduction values below 0.84 dB(A).
• Simultaneous reductions in aerodynamic noise and drag are possible with specific blowing/sucking configurations, offering design insights for low-noise and low-resistance HSMTs.