同济大学学报（自然科学版）2024，Vol.52Issue(z1)：57-70,14.DOI:10.11908/j.issn.0253-374x.24705
基于极限工况的压气机气动噪声排放特性与机理研究
Experimental and Mechanism Study of Aerodynamic Noise Emission Characteristics from a Turbocharger Compressor of Diesel Engines Based on Extreme Operating Conditions
摘要
Abstract
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 an important issue that needs to be addressed urgently.In the studies of diesel engine turbocharger compressors noise emissions,the pattern of compressor aerodynamic noise emissions in the near-surge condition,near-choke condition and its relationship with the internal flow characteristics are still unclear.Therefore,in order to study the aerodynamic noise emission characteristics and mechanism of a diesel engine turbocharger compressor in the near-surge and near-choke conditions,the experimental and numerical simulation methods were used to analyze the aerodynamic noise of a turbocharger compressor in this study.The analysis of experiment results showed that total sound pressure level(SPL)of the aerodynamic noise for the compressor increased with an increase in the speed under the near-surge and near-choke conditions.At low speed,the total SPL of aerodynamic noise was influenced by the mass flow rate of the compressor more obviously.In the compressor aerodynamic noise,the blade passing frequency(BPF)noise was dominated.With the increase of speed,the contribution of BPF noise to the total SPL of aerodynamic noise was greater,and its proportion was up to 75.35%.The analysis of simulation results showed that in the near-surge and near-choke conditions,there were obvious stall phenomena in the internal flow of the compressor.Among them,in the near-choke condition,the rotor and the diffuser regions of the compressor were dominated by multiple monophonic noise,and the dynamic-static interference between the impeller and the diffuser had a high contribution to both the axial frequency and its harmonic frequency noises.In the near-surge condition,the compressor inlet and outlet regions were dominated by low-frequency noises,and the interference between the impeller blades and the incoming air flow had a more obvious contribution to the induced low-frequency noises.关键词
压气机/气动噪声/极限工况/非定常脉动压力/动静干涉Key words
compressor/aerodynamic noise/extreme operating conditions/unsteady fluctuation pressure/dynamic-static interferences分类
能源科技引用本文复制引用
黄荣,倪计民,石秀勇,王琦玮,尹琪..基于极限工况的压气机气动噪声排放特性与机理研究[J].同济大学学报（自然科学版）,2024,52(z1):57-70,14.基金项目
国家自然科学基金青年科学基金(22102116) （22102116）
内燃机可靠性国家重点实验室开放课题基金(skler-202114) （skler-202114）
