A numerical study was conducted to investigate the effects of blade surface roughness on compressor performance and tonal noise emission. The equivalent sand-grain roughness model was used to account for blade surface roughness, and a hybrid method that combines computational fluid dynamics and boundary element method was used to predict compressor performance and tonal noise. The numerical approach was validated against experimental data for a baseline compressor. Nine different cases with different blade surface roughness were studied in this paper, the global performance was analyzed under compressor design speed, and the tonal noise level was predicted under the design condition. The results indicate that compressor total-to-total pressure ratio and isentropic efficiency were gradually decreased with the increasing blade surface roughness. Besides, the blade total pressure loss coefficient and the efficiency loss coefficient were also increased. It was found that the reverse flow at the leading edge of compressor rotor blades reduced blade loading. The pressure fluctuation at the leading edge showed that the peak of pressure fluctuations increased as the blade surface roughness was increased. The sound pressure level at blade-passing frequency shows a significant change with variation in blade surface roughness, which results in an increased total noise level. Furthermore, it was shown that the blade surface roughness had nearly no influence on acoustic directivity, but the sound pressure level increased with the increase in roughness, especially at blade-passing frequency.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Effects of blade surface roughness on compressor performance and tonal noise emission in a marine diesel engine turbocharger


    Contributors:
    Liu, Chen (author) / Cao, Yipeng (author) / Ding, Sihui (author) / Zhang, Wenping (author) / Cai, Yuhang (author) / Lin, Aqiang (author)


    Publication date :

    2020-12-01


    Size :

    15 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    Numerical investigation of marine diesel engine turbocharger compressor tonal noise

    Liu, Chen / Cao, Yipeng / Liu, Yang et al. | SAGE Publications | 2020



    DIESEL ENGINE TRANSIENT OPERATION WITH TURBOCHARGER COMPRESSOR SURGING

    Theotokatos, G. / Kyrtatos, N.P. | SAE Technical Papers | 2001


    Diesel engine transient operation with turbocharger compressor surging

    Theotokatos,G. / Kyrtatos,N.P. / National Tech.Univ.of Athens,GR | Automotive engineering | 2001


    Diesel Engine Transient Operation with Turbocharger Compressor Surging

    Theotokatos, G. / Kyrtatos, N. P. / Society of Automotive Engineers | British Library Conference Proceedings | 2001