Experimental and Mechanism Study of Aerodynamic Noise Emission Characteristics from a Turbocharger Compressor of Heavy-Duty Diesel Engine Based on Full Operating Range

Heavy-duty diesel engines equipped with turbochargers is an effective way to alleviate energy shortage and reduce gas emissions, but their compressor aerodynamic noise emissions have become important issue that needs be addressed urgently. Therefore, study the emission characteristics of a during full operating range, experimental numerical simulation methods were used analyze emissions. The results showed noise’s total sound pressure level (SPL) increased speed under test conditions. At low speeds, SPL was affected by mass flow more obviously. maximum difference 1.55 dB at 60,000 r/min different flows. same speed, could achieve lower in high-efficiency region (middle flows). In noises, blade passing frequency (BPF) played dominant role. transient acoustic-vibration spectral fluctuation analysis indicated BPF its harmonic noises mainly caused unsteady pressure. As increased, contributed noise, percentage up 75.35%. novelty this relationship between internal It provided theoretical basis for reducing heavy-duty engine turbocharger