Single-node sudden-changed section tubular muffler for high-power diesel engine

Abstract

The invention discloses a single-node sudden-changed section tubular muffler for a high-power diesel engine. The single-node sudden-changed section tubular muffler consists of an induction passage, an expansion room and exhaust passages. The traverse section area S1 of the induction passage, the traverse section area S2 of the expansion room, the traverse section area S3 of each exhaust passage and the length l of the expansion room satisfy the equations (1)-(4) in the specification, wherein c relates to exhaust sound velocity m / s; f relates to a frequency which has a larger influence on noise among exhaust frequencies; n relates to the number of the exhaust passages; m is an odd number; and w is zero or a positive integer. Maximum noise reduction can be realized; an optimum noise reduction effect is achieved; blindness in a design process of the muffler is avoided; and a large amount of complicated and tedious trial workload is omitted.

Description

technical field [0001] The invention relates to a single-section abrupt cross-section tubular muffler for a high-power diesel engine, which belongs to the technical field of diesel engine manufacturing. Background technique [0002] At present, high-power diesel engines generally use a single-section abrupt cross-section tubular muffler, which is composed of an intake passage, an expansion chamber and an exhaust passage. The expansion chamber structure is used to reduce the sound pressure of the sound wave, and to make the sound wave reflect and transmit, so as to reduce the noise. purpose, see attached figure 1 . For the muffler of this structure, the length of the expansion chamber and the ratio of the cross-sectional area of ​​each channel to the expansion chamber are crucial to the muffler's noise reduction effect. Simply increasing the length of the expansion chamber and the cross-sectional area of ​​the expansion chamber does not necessarily bring Good noise reductio...

AI Technical Summary

Problems solved by technology

Especially when the length of the expansion chamber is an integer multiple of one-half the wavelength of the noise, the noise reduction of the muffler will be zero; while the expansion chamber with an excessively large cross-sectional area will cause high-frequency failure, which will also reduce the noise reduction. Significantly reduced (see "Design and Calculation of Noise Control Engineering", page 92, edited by Zhi Naigang and Xu Yafen, Water Conservancy and Electric Power Press, first edition in December 1994)

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