Effect of perforation on exhaust performance of a turbo pipe type muffler using methanol and gasoline blended fuel: A step to NOx control

Mishra, Prakash Chandra; Kar, S.; Mishra, Harshit

doi:10.1016/j.jclepro.2018.02.236

Cited by 20 publications

(7 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They studied the effect of hole position and size on transmission drop and concluded that hole position does not affect transmission drop, while with increasing hole diameter, the transmission drop increases at zero frequency, and the opposite occurs at lower frequencies to higher frequencies. Mishra et al [18] numerically examined the turbulent tube muffler. In addition to studying noise reduction, they also examined the reduction of pollution by these types of mufflers and were able to show that the longer the middle chamber length shown is between 20 and 40%, the lower the output noise.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of multi-designed mufflers in internal combustion engines for noise reduction

Adibi,

Razavi,

Hassanpour

et al. 2023

Phys. Scr.

View full text Add to dashboard Cite

Some of the most harmful sources of noise pollution to humans are the exhaust gases of internal combustion engines and factory equipment such as compressors and turbines. An environment contaminated by these sounds can also cause brain cancer. These noise issues can be addressed by installing expansion chambers in the exhaust path. Although numerous studies have been conducted on mufflers, three-dimensional mufflers with non-coaxial inlet and outlet dimensions have not been emphasized in previous studies. To improve the acoustic attenuation performance of the reactive muffler, the effects of different parameters on transmission loss need to be investigated, which is performed in the present paper. The geometry of the muffler was considered one of the noise control parameters. The muffler was modeled using the Helmholtz equation and simulated in COMSOL for analysis. The results demonstrate that the noise level drops with an increase in length, width, and height. The optimal values for the length, width, and height of the muffler are calculated to be 700, 320, and 170 mm, respectively. In addition, the optimum size of the non-coaxial muffler is found 60 mm. Compared to existing mufflers, the proposed muffler reduces noise by 13% to 34%. These research findings will assist the automotive or other related industries to reduce the noise produced by vehicles and other industrial devices.

show abstract

Section: Introductionmentioning

confidence: 99%

Numerical investigation of multi-designed mufflers in internal combustion engines for noise reduction

Adibi,

Razavi,

Hassanpour

et al. 2023

Phys. Scr.

View full text Add to dashboard Cite

show abstract

“…The chambered turbo type mu er with methanol gasoline fuel blends was tested towards better fuel property, performance and emission characteristics (Prakash et al 2018). On road tests were conducted to characterize the harmful gas emissions from petrol and diesel engines, the concentrations of CO and NOx decreased comparatively.…”

Section: Introductionmentioning

confidence: 99%

Influence of Fuel System Variations on Performance and Emission Characteristics of Combined Air-Wall Guided Mode Modified GDI engine with Alcoholic Fuels and Exhaust Gas Recirculation

Nagareddy¹,

Govindasamy²

2022

Preprint

View full text Add to dashboard Cite

GDI engines commercially existed with spray guided mode where the fuel injector placed almost vertically and sprayed fuel is occupied throughout the volume of combustion chamber. With the advanced emission norms, NOx and Soot emissions control is the major task along with lower fuel consumption. To achieve the advanced emission norms, further modifications are required before or during combustion. Combined air-wall guided mode combustion chamber modification is the advanced stage required for further improvement in mixing and superior combustion. Air-wall combined mode involved piston crown shape modification so that the modified shape should impart turbulence effects and divert the fuel/mixture flow towards the spark plug tip to initiate the combustion process. In this study, the combined air-wall guided mode gasoline direct injection engine was tested with gasoline blends using Ethanol, Methanol and N-Butanol at 20, 35 and 50% proportions under specific fixed conditions: 1500 rpm speed, 10% EGR and FIP of 150 bars with three split injections at 320˚, 220˚ and 100˚ before TDC. Tests were conducted over these gasoline blend proportions for engine performance and emission characteristics and achieved beneficial results with E20 gasoline blend over the entire applied torque values.

show abstract

“…The advantages of a faster and simpler model to simulate perforated elements are underlined by the widespread study and optimization of mufflers (Barua and Chatterjee, 2019; Liu et al , 2019; Narasimhan et al , 2020; Liu et al ., 2021) and the importance of perforated elements (Jun et al , 2018; Mishra et al , 2018; Swamy et al , 2020; Kashikar et al , 2021;) for the determination of acoustic properties and backpressure. In fact, for mufflers, the cross-flow perforated pipes/plates are the most significant acoustic noise reduction elements and the most critical ones for backpressure (Fu et al , 2016; Narasimhan et al , 2020; Wang et al , 2013; Venkatagiri et al , 2020).…”

Section: Introductionmentioning

confidence: 99%

Numerical study on modelling perforated elements using porous baffle interface and porous region

D’Amore

Mauro

2021

JEDT

View full text Add to dashboard Cite

Purpose This study aims to analyze simplified methods for modelling the flow through perforated elements (i.e. porous baffle interface and porous region), searching for a faster and easier way to simulate these components. The numerical simulations refer to a muffler geometry available in literature as a case study. Design/methodology/approach The installation of scrubber onboard ships to satisfy the International Maritime Organization emissions regulations is a reliable and efficient solution. However, scrubbers have considerable dimensions, interfering with other exhaust line components. Therefore, scrubber installation in the funnels requires integration with other elements, for example, silencers. Perforated pipes and plates represent the main elements of scrubber and silencers. The study of their layout is, therefore, necessary to reduce emissions and noise. Numerical simulations allow evaluating the efficiency of integrated components. Findings The study highlights that velocity and pressure predicted by the simplified models have a strong correlation with the resistance coefficients. Even though the simplified models do not accurately reproduce the flow through the holes, the use of such models allows a fast and easy comparison between concurrent muffler geometries, giving aid in the early design phases. Originality/value The lack of general guidelines and comparisons in the literature between different modelling strategies of perforated elements supports the novelty of the present work and its impact on design applications. Study the flow inside scrubbers and mufflers is fundamental to evaluate their performances. Therefore, having a simple numerical method is suited for industrial applications during the design process.

show abstract

Effect of perforation on exhaust performance of a turbo pipe type muffler using methanol and gasoline blended fuel: A step to NOx control

Cited by 20 publications

References 19 publications

Numerical investigation of multi-designed mufflers in internal combustion engines for noise reduction

Numerical investigation of multi-designed mufflers in internal combustion engines for noise reduction

Influence of Fuel System Variations on Performance and Emission Characteristics of Combined Air-Wall Guided Mode Modified GDI engine with Alcoholic Fuels and Exhaust Gas Recirculation

Numerical study on modelling perforated elements using porous baffle interface and porous region

Contact Info

Product

Resources

About