Abstract：It is confirmed that the main noise problem of the ceiling duct of a large SUV with rear air conditioning in high-end operation is the low-frequency booming sound in the frequency band of 200 ~ 450Hz through the noise test and subjective evaluation in the semi anechoic chamber first. Then, the CFD model of the ceiling duct including the passenger compartment is numerically simulated based on the large eddy simulation (LES) and acoustic analogy FW-H equation, and the mechanism of vortex pressure pulsation and acoustic mode near by the deflectors in the ceiling duct to the low-frequency band noise is analyzed. Finally, the structure of the the deflectors is optimized on the basis of not affecting the air distribution ratio of the air outlets. The calculation results show that the vortex intensity and the pressure pulsation of observation points near by the deflectors in 250 ~ 450Hz frequency band are significantly reduced, the total sound pressure level of this band is reduced by 4.8 dB (A), and the average value of three peak magnitudes is reduced by 5.5 dB (A).
黄毅，王伟江，秦望,龙书成，付玉乐. 汽车后空调顶棚风管气动噪声数值仿真分析及优化[J]. 振动与冲击, 2023, 42(1): 326-334.
HUANG Yi, WANG Weijiang, QIN Wang, LONG Shucheng, FU Yule. Numerical simulation analysis and optimization of aerodynamic noise of roof duct of car rear air conditioner. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(1): 326-334.
[1] 王魏兴，夏春波，郑召涛，等.基于CFD的某车型顶蒸出风均匀性研究[J].汽车工程学报，2020,10(6):431-435.
WANG Weixing,XIA Chunbo,ZHENG Zhao Ta-o,et al.Optim-
ization of the uniformity of the top steam exhuast air based on CFD[J].Chinese Journal of Automotive Engineering, 2020,10-(6):431-435.
[2] 张佳，吴海波，陈蒨，等.基于格子玻尔兹曼方法的某乘用车空调系统气动噪声的直接模拟与优化[J].汽车工程，20-
20,42(8):1103-1109.
ZHANG Jia,WU Haibo,CHEN Qian,et al.Direct simulation and optimization of the aerodyn-amic noise in a car HVAC sysytem based on LatticeB-oltzmann method[J].Automotive Engineering,2-020,42(8):431-435.
[3] Ayhan A,Raymond A,Christhph C,et al.Prediction of flow-induced noise in automotive HVAC systems using a combined CFD/CA approach[C].SAEWorldCongress.Detroit,Michigan，
2005:05-09-0526.
[4] Yves D,Julien W,Stephene C.Validation of a hybrid CAA met-hod:noise generated by a flap in a simplified HVAC duct[C].-16th AIAA/CEAS Aeroacoustics Conference. MontSaintGui-
bert, Belgium,2010:3995-4011.
[5] Franck P,Mohammed M.Direct flow-induced noise prediction of a simplified HVAC duct using a Lattice Boltzmann Method-[C].19th AIAA/CEAS AeroacousticsConference.Berlin,2013:
2265-22-79.
[6] D Lee, MH Lee, MS Kim,et al.Aroacoustics predictions of automotive HVAC system[C].SAE paper,2010:0415-0428.
[7] Perot F, Meskine M,Vergne S,et al.Aeroacoustic prediction of simplified and production aotumotive HVAC ducts and regist-ers[C].17th AIAA/CEAS Areacoustic Conference,2011:2935.
[8] Perot F,MS Kim,D Fred.Direct aeroacoustics prediction of ducts and vents noise[C].16th AIAA/CEAS Areacoustics Conf-erence,2010:3724.
[9] 李启良，钟立元，王毅刚等.汽车空调气动噪声数值与试验研究[J].同济大学学报（自然科学版），2016,44(4)：620-624.
LI Qiliang,ZHONG Liyuan,WANG Yigang,et al.Experimental and numerical investigation of aerodynamic noise for automot-ive air conditioning[J].JOURNAL OF TONGJI UNIVERSITY
(NATURAL SCIENCE),2016:620-624.
[10] 卿宏军，刘杰.汽车空调风道气动噪声仿真方法研究[J].汽车工程，2018,11（40）：1370-1375.
QING Hongjun ,LIU Jie.An investigation into simulation met-hod of aerodynamic noise in vehicle HVACducts[J]. Automot-
ive Engineering,2018,11(40):1370-1375.
[11] 邓小龙，陈剑，顾蕾等.乘用车暖通空调风管气动噪声模拟研究[J].汽车工程，2006,28（42）：1074-1077.
DENG Xiao long,CHEN Jian,GU Lei,et al.A study on aeroa-coustic simulation for automotive HVAC ducts[J].Automotive Engineering,2006,28(42):1074-1077.
[12] 汪怡平，谷正气，杨雪等.汽车空调出风口管道气动噪声分析与控制[J].湖南大学学报（自然科学版），2010,37（3）：24-28.
WANG Yiping,GU Zhengqi,YANG Xue,et al.Numerical anal-ysis and control of aerodynamic noise of automotive HVAC duct[J].Journal of Huan University(Natural Science),2010,37-
(3):24-28.
[13] 张亚东，张继业，李田等.拖车转向架气动噪声数值研究[J].机械工程学报，2016,52（16）：106-116.
ZHANG Yadong,ZHANG Jiye,LI Tian,et al.Numerical resea-rch on aerodynamic noise of trailer bogie[J].JOURNAL OF M-ECHANICAL ENGINEERING,2016,52(16):106-116.
[14] 李辉，肖新标，金雪松.基于简化模型的头车转向架气动噪声特性研究[J].机械工程学报，2016,52（8）：152-160.
LI Hui,XIAO Xinbiao,JIN Xuesong.Investigation into aerody-namic noise characteristics of train head car bogie based on simplified models[J]. JOURNAL OF MECHANICAL ENGI-NEERING,2016,52(16):152-160.
[15] Jun C,Zhengqi G,Yiping W.Numerical simulation of noise ind-uced by flow in HVAC ventila-tion ducts[C].SAE paper,2011:0505-0517.
[16] 宁方立，马尧，王善景等.飞机起落架气动噪声的数值计算方法[J].机械工程学报，2013,49（8）：171-177.
NING Fangli,MA Yao,WANG Shanjing,et al.Numerical comp-utaion method for predicting aircraft landing gear noise[J]. JOURNAL OF MECH-ANICALENGINEERING,2013,49(8):
171-177.
[17] 李珊珊.A级汽车暖通空调系统流动噪声分析[D].长春：吉林大学，2016.
