Prediction of Combustion Process Induced Vehicle Interior Noise

Alt, Norbert; Nehl, Jakob; Heuer, Stefan; Schlitzer, Michael Winfried

doi:10.4271/2003-01-1435

Cited by 17 publications

(6 citation statements)

References 4 publications

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“…Combustion noise is considering the mechanical and flow noise emissions as well as direct and indirect noise emissions from the combustion and is calculated according to the study by Alt et al 29 Since the intake and exhaust pressures as well as the engine speed do not change, only the combustion is having an impact on noise emission changes. The combustion noise emissions are governed by the peak cylinder pressure and the pressure rise rate.…”

Section: Resultsmentioning

confidence: 99%

Impact of increased injector nozzle hole diameters on engine performance, exhaust particle distribution and methane and formaldehyde emissions during dimethyl ether operation

Zubel

Lehrheuer

Pischinger

2019

International Journal of Engine Research

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E-Fuels can play a significant role in decarbonizing the transport sector. Among the potential E-fuels, dimethyl ether is a promising candidate for the combustion in compression ignition engines. Together with methanol, it can be produced from synthesis gas in a combined single-step process. However, due to the low volumetric heating value of dimethyl ether, the fuel injection system has to be modified to realize higher fuel flow rates. In this study, two injectors with increased nozzle hole diameters have been investigated, and their impact on engine performance, particle number distribution and formaldehyde as well as methane emissions was assessed. It was found that with dimethyl ether as fuel, the indicated efficiency at high load could be increased by over 1% compared to operation with conventional diesel fuel. The main reason for this is lower wall heat loss. Furthermore, almost no particle emission was found during dimethyl ether operation with the smaller nozzle. With the larger nozzle hole diameter, increased particle concentrations were measured at high loads. But these were still much lower compared to the corresponding diesel fuel combustion. Regarding formaldehyde and methane, higher emissions were found for the dimethyl ether combustion compared to diesel fuel combustion. It is assumed that this is due to the increased formaldehyde and methane production of dimethyl ether during high temperature pyrolysis and oxidation. The increased hydrocarbon emissions could have been caused by fuel dripping from the nozzle after the end of the injection event.

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Section: Resultsmentioning

confidence: 99%

Impact of increased injector nozzle hole diameters on engine performance, exhaust particle distribution and methane and formaldehyde emissions during dimethyl ether operation

Zubel

Lehrheuer

Pischinger

2019

International Journal of Engine Research

View full text Add to dashboard Cite

show abstract

“…As seen in Figure , also noise emissions mainly depend upon the cetane number, while the impact increases with a decreasing cetane number. The noise emissions were calculated from the measured cylinder pressure traces and converted into the one-dimensional indicator “combustion sound level (CSL)” . Generally, the combustion of fuels with very low cetane numbers will result in the highest noise emissions, independent of the aromatic or oxygen content of the fuel.…”

Section: Model-based Analysis Of Fuel Propertiesmentioning

confidence: 99%

Tailor-Made Fuels from Biomass for Homogeneous Low-Temperature Diesel Combustion

et al. 2011

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The use of modern biofuels in mobile applications has an enormous potential to reduce greenhouse gases as well as engine pollutant emissions, such as soot or nitrogen oxides. This beneficial effect is directly related to the molecular structure of the biofuel as a product of an optimized production process. To understand the influence and emission reduction potential of the large variety of different fuel properties, this study aims to identify desirable fuel characteristics and define optimized biofuel components. In a first step, a literature survey is carried out, focusing on the impact of the cetane number, boiling characteristics, and aromatic and oxygen contents on the diesel combustion process. The incorporated investigations that analyze the combustion behavior, engine efficiency, and emission performance underline the potential of tailoring fuels to desired properties. From this foundation, a modelbased analysis of desired fuel properties was conducted, using a large database with 32 different fuels (single molecules and fuel mixtures). With multiple correlation methods, different fuel properties can be used to predict the emission performance of the engine. The following fuel optimization based on emission performance and engine efficiency results in ideal fuel properties for diesel engine combustion. As it turns out, a blend of 2-methyltetrahydrofurane (2-MTHF) (which can be derived from cellulose) blended with di-n-butylether complies with the desired fuel properties, which were defined before. In combination with an improved homogeneous low-temperature combustion process and an increased ignition delay, a nearly soot-free diesel combustion over a wide load range is realized. The oxygenated fuel enables increased exhaust gas recirculation (EGR) rates while maintaining the high engine efficiency of the diesel process.

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“…Por ello, es importante entender y separar las diferentes contribuciones al ruido del vehículo, basándose en la principal fuente de ruido que es el motor. Existen varias posibilidades para diferenciar las fuentes de ruido en un vehículo [4,11]. La figura 2.1 presenta cinco fuentes responsables de la generación de ruido:…”

Section: Fuentes Del Ruido Del Motorunclassified

“…En la figura 2.2 se muestran las distintas contribuciones al ruido del motor [4,5], que son el ruido mecánico, el ruido de combustión y el ruido de accesorios.…”

Section: Ruido De Combustiónunclassified

“…Idealmente este ruido sería el resultado de las fuerzas de presión actuando directamente sobre la estructura, suponiendo que no hay tolerancias. Figura 2.2: Distribución del ruido del motor [4] Figura 2.3: Relación entre el ruido de combustión y las fuerzas de excitación [4] El segundo grupo de fuerzas es proporcional a la fuerza rotativa que causa el ruido de combustión indirecto, forzando a los componentes del motor a moverse en sus tolerancias, lo que provoca impactos. La carga en el cigüeñal y la fuerza lateral sobre el pistón generan respectivamente ruido en el cigüeñal y el cabeceo del pistón sobre la pared de cilindro.…”

Section: Ruido De Combustiónunclassified

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Estudio CFD de la resonancia en la cámara de combustión de Motores Diesel HDI

Ramírez¹,

José²

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Prediction of Combustion Process Induced Vehicle Interior Noise

Cited by 17 publications

References 4 publications

Impact of increased injector nozzle hole diameters on engine performance, exhaust particle distribution and methane and formaldehyde emissions during dimethyl ether operation

Impact of increased injector nozzle hole diameters on engine performance, exhaust particle distribution and methane and formaldehyde emissions during dimethyl ether operation

Tailor-Made Fuels from Biomass for Homogeneous Low-Temperature Diesel Combustion

Estudio CFD de la resonancia en la cámara de combustión de Motores Diesel HDI

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