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 600Hz 1/3倍频程带内,"泄气声"成分声压级值降低达18dB(A)左右,总值降低达10.3dB(A)以上,特定频率处消声效果显著。
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 SPI. 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.
出处
《内燃机工程》
EI
CAS
CSCD
北大核心
2017年第2期135-140,共6页
Chinese Internal Combustion Engine Engineering
基金
"十二五"国家科技支撑计划重点项目(2011BAE22B05)
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
IC engine
perforated intake pipe
rectangular pulse approach
transmission lost
mean flow
road test
