Numerical analysis of the Internal Flow of 8kW Grade Diesel Generator Muffler

Yi, Chung-Seob; Lee, Tae Eui; Lee, Chi Woo

doi:10.14775/ksmpe.2018.17.3.045

Cited by 7 publications

(2 citation statements)

References 5 publications

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“…The silencer is divided into a resonance type that focuses on sound wave synthesis, a vane type that induces dissipation and synthesis at the same time, and an expansion type that focuses on dissipation. Various studies are being conducted on the flow characteristics and acoustic characteristics according to the shape of the silencer for noise reduction [20][21][22][23][24][25][26][27]. Hwang et al [20] investigated the internal structure of the silencer, classified its components, and studied the noise and back pressure characteristics of the silencer.…”

Section: Introductionmentioning

confidence: 99%

“…Kim and Jeong [22] modeled a circular simple expansion pipe divided by a bulkhead with holes, and studied acoustic and flow characteristics through computational analysis. Yi et al [23] studied the pressure loss through the internal flow analysis of a silencer for an 8 kW diesel generator. Secgin et al [24] studied the acoustic characteristics through computational analysis by changing the baffle position, number, and extension shape of the baffle in the expansion tube.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Composite Scrubber with Built-In Silencer for Marine Engines

Ryu

Park

2021

JMSE

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The International Maritime Organization (IMO) is strengthening regulations on reducing sulfur oxide emissions, and the demand for reducing exhaust noise affecting the environment of ships is also increasing. Various technologies have been developed to satisfy these needs. In this paper, a composite scrubber for ships that can simultaneously reduce sulfur oxide and noise was proposed, and the flow characteristics and noise characteristics were analyzed. For the silencer, vane type and resonate type were applied. In the case of the vane type, the effects of the direction, size, and location of the vane were analyzed, and in the case of the resonate type, the effects of the hole location and the number of holes were analyzed. The result shows that the length increase of the vane increased the average transmission loss and had a great effect, especially in the low frequency region. The transmission loss increased when the vane was installed outside, and the noise reduction effect was excellent when the vane was in the reverse direction. In the resonate type, increasing the number of holes is advantageous for noise reduction. The condition for maximally reducing noise in the range not exceeding 840 Pa, which is 70% of the allowable back pressure, is a vane length of 225 mm in the outer vane reverse type. The pressure drop under this condition was 777 Pa, and the average transmission losses in the low frequency region and the entire frequency region were 43.5 and 54.5 dB, respectively.

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