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Effects of blade surface roughness on compressor performance and tonal noise emission in a marine diesel engine turbocharger
Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering ( IF 1.7 ) Pub Date : 2020-06-09 , DOI: 10.1177/0954407020927637
Chen Liu 1 , Yipeng Cao 1 , Sihui Ding 1 , Wenping Zhang 1 , Yuhang Cai 1 , Aqiang Lin 1
Affiliation  

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.

中文翻译:

叶片表面粗糙度对船用柴油机涡轮增压器压气机性能和噪声排放的影响

进行了数值研究以研究叶片表面粗糙度对压缩机性能和音调噪声排放的影响。等效沙粒粗糙度模型用于解释叶片表面粗糙度,结合计算流体动力学和边界元方法的混合方法用于预测压缩机性能和音调噪声。数值方法根据基准压缩机的实验数据进行了验证。本文研究了具有不同叶片表面粗糙度的九种不同情况,分析了压缩机设计速度下的整体性能,并预测了设计条件下的音调噪声水平。结果表明,随着叶片表面粗糙度的增加,压气机总压比和等熵效率逐渐降低。此外,叶片总压力损失系数和效率损失系数也有所增加。发现压气机转子叶片前缘处的反向流动降低了叶片载荷。前缘压力波动表明,随着叶片表面粗糙度的增加,压力波动的峰值增加。叶片通过频率处的声压级随着叶片表面粗糙度的变化而发生显着变化,从而导致总噪声级增加。此外,结果表明,叶片表面粗糙度对声学方向性几乎没有影响,但声压级随着粗糙度的增加而增加,特别是在叶片通过频率下。发现压气机转子叶片前缘处的反向流动降低了叶片载荷。前缘压力波动表明,随着叶片表面粗糙度的增加,压力波动的峰值增加。叶片通过频率处的声压级随着叶片表面粗糙度的变化而发生显着变化,从而导致总噪声级增加。此外,结果表明,叶片表面粗糙度对声学方向性几乎没有影响,但声压级随着粗糙度的增加而增加,特别是在叶片通过频率下。发现压气机转子叶片前缘处的反向流动降低了叶片载荷。前缘压力波动表明,随着叶片表面粗糙度的增加,压力波动的峰值增加。叶片通过频率处的声压级随着叶片表面粗糙度的变化而发生显着变化,从而导致总噪声级增加。此外,结果表明,叶片表面粗糙度对声学方向性几乎没有影响,但声压级随着粗糙度的增加而增加,特别是在叶片通过频率下。前缘压力波动表明,随着叶片表面粗糙度的增加,压力波动的峰值增加。叶片通过频率处的声压级随着叶片表面粗糙度的变化而发生显着变化,从而导致总噪声级增加。此外,结果表明,叶片表面粗糙度对声学方向性几乎没有影响,但声压级随着粗糙度的增加而增加,特别是在叶片通过频率下。前缘压力波动表明,随着叶片表面粗糙度的增加,压力波动的峰值增加。叶片通过频率处的声压级随着叶片表面粗糙度的变化而发生显着变化,从而导致总噪声级增加。此外,结果表明,叶片表面粗糙度对声学方向性几乎没有影响,但声压级随着粗糙度的增加而增加,特别是在叶片通过频率下。
更新日期:2020-06-09
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