Comparison of Compression Ignition Engine Noise Metrics in Low-Temperature Combustion Regimes

Shahlari, Arsham J.; Hocking, Chris; Kurtz, Eric; Ghandhi, J. B.

doi:10.4271/2013-01-1659

Cited by 93 publications

(69 citation statements)

References 5 publications

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“…This parameter is of interest because it has been shown to be the primary driver in combustion-generated noise in engines. 86,87 In addition, the combustion noise level (CNL) is shown, which was calculated using the algorithm put forward by Shahlari et al 88 Considering these are closed-cycle simulation results, an algorithm also put forward by Shahlari et al 89 was used to calculate the full four-stroke cycle noise from closed-cycle simulation results. As shown in Table 3, CDC operation yields the lowest combustion noise, which is expected due to the mixing limited nature of the majority of the combustion process, which yields a more sedate energy release than volumetric autoignition.…”

Section: Simulated Results Of the Baseline Operating Conditionmentioning

confidence: 99%

A perspective on the range of gasoline compression ignition combustion strategies for high engine efficiency and low NOx and soot emissions: Effects of in-cylinder fuel stratification

Dempsey

Curran

Wagner

2016

International Journal of Engine Research

140

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Many research studies have shown that low temperature combustion in compression ignition engines has the ability to yield ultra-low NOx and soot emissions while maintaining high thermal efficiency. To achieve low temperature combustion, sufficient mixing time between the fuel and air in a globally dilute environment is required, thereby avoiding fuel-rich regions and reducing peak combustion temperatures, which significantly reduces soot and NOx formation, respectively. It has been demonstrated that achieving low temperature combustion with diesel fuel over a wide range of conditions is difficult because of its properties, namely, low volatility and high chemical reactivity. On the contrary, gasoline has a high volatility and low chemical reactivity, meaning it is easier to achieve the amount of premixing time required prior to autoignition to achieve low temperature combustion. In order to achieve low temperature combustion while meeting other constraints, such as low pressure rise rates and maintaining control over the timing of combustion, in-cylinder fuel stratification has been widely investigated for gasoline low temperature combustion engines. The level of fuel stratification is, in reality, a continuum ranging from fully premixed (i.e. homogeneous charge of fuel and air) to heavily stratified, heterogeneous operation, such as diesel combustion. However, to illustrate the impact of fuel stratification on gasoline compression ignition, the authors have identified three representative operating strategies: partial, moderate, and heavy fuel stratification. Thus, this article provides an overview and perspective of the current research efforts to develop engine operating strategies for achieving gasoline low temperature combustion in a compression ignition engine via fuel stratification. In this study, computational fluid dynamics modeling of the in-cylinder processes during the closed valve portion of the cycle was used to illustrate the opportunities and challenges associated with the various fuel stratification levels.

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Section: Simulated Results Of the Baseline Operating Conditionmentioning

confidence: 99%

A perspective on the range of gasoline compression ignition combustion strategies for high engine efficiency and low NOx and soot emissions: Effects of in-cylinder fuel stratification

Dempsey

Curran

Wagner

2016

International Journal of Engine Research

140

View full text Add to dashboard Cite

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“…It is essential to reduce exhaust emissions as well as combustion noises, which account for about 80% of total engine noise (Li et al, 2001). The pressure rise rate, dp/dt, is a major cause of combustion noise (Selim, 2003;Shahlari et al, 2013;Torregrosa et al, 2013). Thus, in this paper, we investigated a multiple injection strategy to decrease the pressure rise rate.…”

Section: Nomenclature CImentioning

confidence: 97%

Effect of pilot injection on engine noise in a single cylinder compression ignition engine

Yoon

Park

et al. 2015

Int.J Automot. Technol.

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An experimental study was performed to investigate the effect of pilot injection on engine noise using a single cylinder combustion ignition engine. The engine rotary speed was fixed at 1200 RPM and a 10-mg quantity was injected at a pilot injection ratio of 1:9, 2:8, or 3:7. The engine performance parameters were calculated from the combustion pressure data acquired by a piezoelectric transducer (6057A80, Kistler), which was placed in the location of the glow plug. Engine noise was measured at a distance and height of 1 meter each from the engine for 9-10 seconds and analyzed using a commercial sound analysis program. By analyzing in-cylinder pressure and sound quality metrics, the following conclusions were obtained. The frequency analysis showed that the combustion noise was distributed at the frequency bands from 1100 Hz to 1900 Hz and from 2100 Hz to 2900 Hz. Pilot injections lowered the maximum rate of pressure increase, and the trend of the maximum pressure rise rate varied significantly according to injection pressure. The maximum pressure rise rate exhibited a linear relationship with sound level and loudness. Thus, the pilot injection strategy appeared to improve engine noise characteristics.

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“…When the exhaust valve of each cylinder of the engine is opened, the exhaust gas in the cylinder will be ejected at high speed, which impact on the gas in the exhaust pipe near the valve resulting in pressure changes violently, thus aroused noise. Since the exhaust of each cylinder is carried out in a specified phase according to the period, the law of fundamental frequency noise is periodic [13,14]. It is typical of low frequency noise.…”

Section: Fig 2 Experimental Prototypementioning

confidence: 99%

The noise analysis of micro combined heat and power system

Zhang¹,

Maolin²,

Xu³

et al. 2017

Proceedings of the 2017 2nd International Conference on Materials Science, Machinery and Energy Engineering (MSMEE 2017)

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This paper presents an analysis aimed to evaluate the noise of micro-CHP systems. Based on the field test of insertion loss, the spectrum characteristics of CHP before and after the heat exchanger were analyzed. Finally the main source of noise is estimated, and the influence of speed and heat exchanger on noise is analyzed. The results show that the fundamental frequency noise is the main noise source, accompanied by other resonance noise. The increase of the rotation speed will cause the noise to move to the high frequency direction. System with heat exchanger can reduce high frequency noise.

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Comparison of Compression Ignition Engine Noise Metrics in Low-Temperature Combustion Regimes

Cited by 93 publications

References 5 publications

A perspective on the range of gasoline compression ignition combustion strategies for high engine efficiency and low NOx and soot emissions: Effects of in-cylinder fuel stratification

A perspective on the range of gasoline compression ignition combustion strategies for high engine efficiency and low NOx and soot emissions: Effects of in-cylinder fuel stratification

Effect of pilot injection on engine noise in a single cylinder compression ignition engine

The noise analysis of micro combined heat and power system

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