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Research of Low Heat-mass 4 in 1 Exhaust Manifold Noise Reduction Technology

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

Summary

A noise generation mechanism of intermittent high-frequency noise during deceleration and high-frequency noise under load in a dual-thin-wall 4-in-1 exhaust manifold (hereinafter referred to as 4-1 manifold) have been investigated by using Computational Fluid Dynamics (CFD) and actual measurement of exhaust gas pressure fluctuation in the exhaust manifold. Modified gas flow in the exhaust manifold by CFD enabled a reduction actual exhaust gas pressure fluctuation, which is the excitation force, and actual radiated noise has been reduced.

Reference

(1) Kitagawa, H., Mibe, T., Okamatsu, K., Yasui, Y.: Super Ultra Low Emission System for ACCORD SULEV, HONDA R&D Technical Review, Vol. 12, No. 2, p. 37-44 (2000)
(2) Kishi, N., et al.: Development of the Ultra Low Heat Capacity and Highly Insulating (ULOC) Exhaust Manifold for ULEV, SAE Paper, SAE980937 (1998)
(3) Hashimoto, H., Ishii, K., Mibe, T.: Development of the 4-into-2 Low Heat Capacity Exhaust Manifold for High Power Engine, HONDA R&D Technical Review, Vol. 11, No. 1, p. 85-92 (1999)
(4) Ishii, K., Munemura, T., Yoshida, N.: Development of a Low Heat-Capacity Exhaust Manifold for SULEV, Honda R&D Technical Review, Vol. 14, No. 2, p. 69-76 (2002)

Author (organization or company)

Hitoshi OOUCHI(Tochigi R&D Center)、Masaki AGURO(Tochigi R&D Center)、Toru HISANAGA(Yutaka Giken Co., Ltd.)

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