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Clarification of Mechanism of Exhaust Orifice Noise via Exhaust Pulsating Flow Simulation

Article of Honda R&D Technical Review Vol.17 No.2

Summary

Regulations relating to environmental noise generated by automobiles are becoming increasingly stringent, making it essential to develop simulation technologies to contribute to the reduction of exhaust noise. The authors attempted to make the pulsing exhaust flow produced by an internal combustion engine visible using Schlieren photography and to visualize the source of exhaust orifice noise using noise holography. The knowledge obtained from these experiments was used to develop an exhaust pulsating flow simulation technology for exhaust orifice noise that enables quantitative prediction of levels. The major components of exhaust orifice noise are compression waves and ring vortices; the new simulation technology enabled further clarification of the mechanism of production of this noise.

Reference

(1) Sakurai, M., et al.: Development of Exhaust System Radiation Noise Simulation Technology using Exhaust Pulsation, Transactions of Society of Automotive Engineers of Japan, Vol. 36, No. 2, p. 71-76 (2005)
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(3) Higashiyama, J., et al.: Experimental study of exhaust noise generated by pulsating flow downstream of pipe end, JSAE Review 20, p. 73-79 (1999)
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(10) Nakagawa, H., Yoshimoto, H., Endo, M., Shirahige, Y., Fujishiro, M., Sakurai, M.: Development of the Exhaust System Radiation Noise Simulation Technology Using Exhaust Pulsation, Honda R&D Technical Review, Vol. 14, No. 2, p. 195-202 (2002)
(11) Kimura, A., et al.: A Study on Generation of Noise of Highspeed Pulsating Jet, Transactions B section of The Japan Society of Mechanical Engineers, Vol. 67-664, p. 57-64 (2001)

Author (organization or company)

Masato SAKURAI(Tochigi R&D Center)、Kenichi TANAKA(Tokyo Denki University)、Yuuya KASAJIMA(Tokyo Denki University)

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