Experimental study of Helmholtz water-mufflers used in centrifugal pumps
Yuan Jianping1, Zhang Ruicheng1, Jin Rong2
1.Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.Institute of 707, China Ship Building Industry Corporation, Jiujiang, Jiangxi 332007, China
Abstract:The acoustic characteristics of a Helmholtz water-muffler with different lengths of neck were measured by using the transfer function method to investigate the muffler performance, and then the experimental results were compared with those numerically simulated. In the experiment, a Helmholtz water-muffler with a single resonator of semi-cylinder was used, and two hydrophones and one pressure transducer were installed in the front and back of the muffler. The hydrophones were used to measure dynamic pressure signals, but the transducers were applied to monitor the static pressures at the inlet and outlet of the muffler so as to figure out the differential pressure across it and eventually to obtain the pressure losses across the muffler under different working conditions. The length of the original neck is 12 cm, and this length was altered to 20, 30, 40 and 50 cm, respectively. It was shown that the resonant frequency decreases with increasing length of neck and the transmission loss ascends initially and then decreases, the measured acoustic characteristics agree well with the theoretical predictions. The length of neck has a modest influence on pressure loss. The pressure loss depends on wor-king condition, and it increases with increasing flow rate.
袁建平, 张瑞橙, 金荣. 离心泵用赫姆霍兹水消声器试验研究[J]. 排灌机械工程学报, 2013, 31(11): 933-937.
Yuan Jianping, Zhang Ruicheng, Jin Rong. Experimental study of Helmholtz water-mufflers used in centrifugal pumps. Journal of Drainage and Irrigation Machinery Engin, 2013, 31(11): 933-937.
[1]袁建平,金荣,陈红亮,等.离心泵用赫姆霍兹水消声器声学特性数值模拟[J].排灌机械工程学报,2012,30(2):141-146. Yuan Jianping, Jin Rong, Chen Hongliang, et al. Numerical simulation of acoustic performance of Helmholtz water-muffler for centrifugal pumps[J]. Journal of Drainage and Irrigation Machinery Engineering, 2012,30(2): 141-146.(in Chinese)[2]Harald Ortwing. Experimental and analytical vibration analysis in fluid power systems[J]. International Journal of Solid and Structures, 2005,42(21/22): 5821-5830.[3]刘侍刚,郑雄胜,缪赟,等.扩张室水消声器实验分析[J].浙江海洋学院学报:自然科学版,2001,20(3):226-229. Liu Shigang, Zheng Xiongsheng, Miao Yun, et al. Analysis of the water expanded muffler based on experiment[J]. Journal of Zhejiang Ocean University: Natural Science, 2001, 20(3): 226-229.(in Chinese)[4]柳贡民,程广福,张文平,等.用传递函数法测量水消声器传递损失[J].噪声与振动控制,2001(4):34-36. Liu Gongmin, Cheng Guangfu, Zhang Wenping, et al. Transfer function used to measure the transmission of water-muffler[J]. Noise and Vibration Control, 2001(4): 34-36.(in Chinese)[5]杨良君,刘侍刚,张文平.内插管扩张室水消声器实验分析[J]. 浙江海洋学院学报:自然科学版,2002,21(2):195-201. Yang Liangjun, Liu Shigang, Zhang Wenping. Analyzing the water expanded muffler with inter spile based on experiment[J]. Journal of Zhejiang Ocean University: Natural Science, 2002, 21(2): 195-201.(in Chinese)[6]褚志刚,徐少华,卢喜,等.基于传递函数的消声器传声损失测量技术研究[J]. 振动与冲击,2009,28(7):203-207. Chu Zhigang, Xu Shaohua, Lu Xi, et al. Measurement of transmission loss of a muffler based on transfer function[J]. Journal of Vibration and Shock, 2009, 28(7):203-207.(in Chinese)[7]阮登芳,邓兆祥,杨诚. 共振式消声器声学性能分析[J].内燃机工程,2006,27(1):66-70. Ruan Dengfang, Deng Zhaoxiang, Yang Cheng. Analysis of acoustic performance of the resonant silencer[J]. Chinese Internal Combustion Engine Engineering,2006,27(1): 66-70.(in Chinese)[8]王雪仁,缪旭弘,季振林,等. 管道和消声器声学性能的试验测量技术研究[J]. 内燃机工程,2009,30(2):39-44. Wang Xueren, Miao Xuhong, Ji Zhenlin, et al. Research on experimental measurement technique for acoustic performance of ducts and silencers[J]. Chinese Internal Combustion Engine Engineering, 2009,30(2):39-44.(in Chinese)[9]Unnikris N S, Shete C D, Subramoniam A, et al. Experimental and computational investigation of coupled resonator-cavity systems[J]. Applied Acoustics, 2010,71(1): 61-67.[10]Tang S K. On Helmholtz resonators with tapered necks[J]. Journal of Sound and Vibration, 2005, 279(3/4/5):1085-1096.[11]Xu M B, Selamet A, Kim H. Dual Helmholtz resonator[J]. Applied Acoustics, 2010,71(9): 822-829.[12]王彬.MATLAB数字信号处理[M].北京:机械工业出版社,2010.