李恒，郝志勇，郑旭，刘联鋆.穿孔引气管声学特性矩形脉冲法模拟及试验[J].内燃机工程,2017,38(2):135-140.
穿孔引气管声学特性矩形脉冲法模拟及试验
Rectangular-Pulse Method Based on Simulation and Experiment of Acoustic Performance of Perforated Intake Pipe
DOI：
关键词:内燃机  穿孔引气管  矩形脉冲法  传递损失  平均流  道路试验
Key Words:IC engine  perforated intake pipe  rectangular pulse approach  transmission lost  mean flow  road test
基金项目:“十二五”国家科技支撑计划重点项目（2011BAE22B05）
作者单位
李恒，郝志勇，郑旭，刘联鋆 浙江大学 能源工程学院，杭州 310027 
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摘要:基于计算流体动力学（CFD）的矩形脉冲法计算消声结构的声学特性。首先，计算单腔穿孔结构的静态传递损失（TL），并研究各结构参数对声学特性的影响规律；之后，采用矩形脉冲法计算无流条件穿孔引气管的传递损失，并与有限元法计算结果相对比，验证其正确性；然后，研究平均流对穿孔引气管传递损失的影响，发现逆向气流使TL峰值略往低频移动，而在幅值上无明显的变化规律；最后，安装穿孔引气管进行整车道路试验。结果表明：无论加速、急加-减速工况下，优化后进气管口噪声均得到明显的衰减；尤其在500~1 600 Hz 1/3倍频程带内，“泄气声”成分声压级值降低达18 dB(A)左右，总值降低达10.3 dB(A)以上，特定频率处消声效果显著。
Abstract:A rectangular pulse approach based on the CFD was proposed for simulating the acoustic performance of a muffling structure. First, the transmission loss of a single cavity perforated element was calculated neglecting airflow, and the influence of each structure parameter on the acoustic performance was researched respectively. Then, the transmission loss of a perforated intake pipe without airflow was obtained by the rectangular pulse approach and was compared with its FEM result to verify the validation. After that, the effect of mean flow on the transmission loss of the perforated intake pipe was achieved as well, revealing that reversing airflow makes the position of the peak transmission loss move slightly to the direction of low frequency with irregular change in the amplitude. Finally, a road test for an engine equipped with such perforated intake pipe was carried out. The result indicates that the intake sound pressure level (SPL) reduces apparently either at normal acceleration or emergency acceleration, especially in the frequency range of 500 to 1 600 Hz viewed in 1/3 octave spectrum, the SPL of snuffling noise reduces by almost 18 dB(A), and the overall SPL by more than 10.3 dB(A). Such perforated intake pipe has been proved to be excellent in improving the acoustic performance of an intake system.
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