Increased efficiency in SI engine with air replaced by oxygen in argon mixture

Killingsworth, Nick; Rapp, Vi H.; Flowers, Daniel L.; Aceves, Salvador M.; Chen, Jyh-Yuan; Dibble, Robert W.

doi:10.1016/j.proci.2010.07.035

Cited by 69 publications

(34 citation statements)

References 9 publications

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“…Theoretically, an increase in the ideal thermal efficiency can be achieved by replacing nitrogen with higher specific heat ratio gases such as argon and xenon. These efficiency gains have been roughly demonstrated recently by several groups [1][2][3]. Moreover, using noble gases in combination with oxygen effectively eradicates NOx from the combustion products due to the lack of nitrogen.…”

Section: Introductionmentioning

confidence: 83%

The Effect of Heavy Working Fluids on Hydrogen Combustion

Shahsavan¹,

Mack²

2017

Preprint

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Abstract:The thermodynamic efficiency of internal combustion engines is dependent on the compression ratio and specific heat ratio of the working fluid. Using a mixture of oxygen and noble gases instead of air can increase the thermal efficiency due to their higher specific heat ratio. It also has advantage of eliminating NOx caused by lack of nitrogen. In this study, the three dimensional turbulent injection of hydrogen into a constant volume combustion chamber has been modeled and compared to mixtures of oxygen with nitrogen, argon and xenon. All conditions including the mass flow rate of the injected fuel, injection velocity, and initial temperature and pressure of the chamber were kept constant. The results indicate that the hydrogen jet has more penetration length in nitrogen compared to argon and xenon. However, the smaller penetration lengths lead to more complex jet shapes and larger cone angles. In combination with the higher specific heat ratio, combustion in a noble gas environment results in higher temperatures and OH radical concentrations. Furthermore, mixedness is investigated using mean spatial variation and mean scalar dissipation. Hydrogen in argon shows a better mixing rate compared to nitrogen and xenon due to higher diffusivity.

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Section: Introductionmentioning

confidence: 83%

The Effect of Heavy Working Fluids on Hydrogen Combustion

Shahsavan¹,

Mack²

2017

Preprint

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“…For future zero-emission ICEs, a new concept referred to as the argon power cycle (APC) was proposed by Robert Dibble [33]. An APC engine uses hydrogen or methane as fuel, 10 Work principle of the ICRC engine [32].…”

Section: Requirements and Challenges For Future Development Of An Autmentioning

confidence: 99%

“…The specific heat ratio of argon, a monatomic molecule, is higher than that of air with its characteristics of a wide range of inert gas sources. This new method of realizing high-efficiency and zero-emission combustion has attracted many researchers in the field around the world [33][34][35]. For a hydrogen-fueled APC system (Fig.…”

Section: Requirements and Challenges For Future Development Of An Autmentioning

confidence: 99%

“…From the effect of argon on the indicated work over a working cycle and the maximum in-cylinder tempera- Fig. 13 Effect of compression ratio and specific heat ratio on the thermal efficiency [33] Fig. 14 Effect of argon on the indicated work, in-cylinder pressure, and temperature versus crank angle degrees (CAD) after top dead center (ATDC) ture and pressure based on simulations for reference (Fig.…”

Section: Requirements and Challenges For Future Development Of An Autmentioning

confidence: 99%

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$$\hbox {CO}_{2}$$ CO 2 Reduction Request and Future High-Efficiency Zero-Emission Argon Power Cycle Engine

Gong

Deng

et al. 2018

Automot. Innov.

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To meet the requirements of strict fuel consumption and emission limits, continuously increasing the thermal efficiency of an internal combustion engine and decreasing its exhaust emissions are the main challenges to its sustainable development within the automotive industry. Considering the competition with other zero-emission powertrain systems, such as vehicle batteries and fuel cells, the development of the internal combustion engine needs to focus on producing higher efficiency and zero emissions to meet the request of CO 2 reduction. This paper introduces two novel concepts for an internal combustion engine featuring high efficiency and zero emissions. Referred to as the argon power cycle engine fueled with either hydrogen or natural gas within an oxygen-argon mixture, its fundamentals and characteristics are expounded. This includes a method necessary to absorb carbon dioxide when natural gas is used as fuel instead of hydrogen.

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“…Replacing the working fluid can drastically impact the combustion characteristics since it can increase the ideal thermal efficiency by using high specific heat ratio gases such as argon and xenon instead of nitrogen [10,11]. A more recent experimental study has been carried out on the effect of noble gases on fuel propagation and thermal characteristics of gaseous direct injection; it has been shown that argon can be a potentially beneficial alternative working fluid [12].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Mixedness on Ignition for Hydrogen Direct Injection in a Constant Volume Combustion Chamber

Shahsavan¹,

Morovatiyan²,

Mack³

2018

Preprint

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Abstract:The ignition behavior of the fuel in non-premixed turbulent combustion applications such as diesel engines and gas turbines is dependent on the mixing rate of the injected fuel and the working fluid. In this study, three-dimensional modeling of hydrogen injection into a constant volume combustion chamber (CVCC) is used to investigate the correlation between the mixing rate and important parameters of nonpremixed combustion, such as ignition delay. Mixedness is quantified using mean spatial variation, which reflects the homogeneity of the mixture, and mean scalar dissipation, which represents the local gradients of the scalar. The case studies include nitrogen and argon as working fluids; injection velocities and nozzle diameters are varied for comparison. For consistency, the injected mass is kept constant and the injection duration is adjusted accordingly. The results indicate that a strong correlation exists between ignition delay and the defined mixedness parameters. The cases with higher mixedness values lead to a shorter ignition delay and a higher maximum flame temperature. Changing the working fluid and injection parameters can effectively modify the mixedness, and consequently affect the ignition onset and flame properties.

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Increased efficiency in SI engine with air replaced by oxygen in argon mixture

Cited by 69 publications

References 9 publications

The Effect of Heavy Working Fluids on Hydrogen Combustion

The Effect of Heavy Working Fluids on Hydrogen Combustion

$$\hbox {CO}_{2}$$ CO 2 Reduction Request and Future High-Efficiency Zero-Emission Argon Power Cycle Engine

The Influence of Mixedness on Ignition for Hydrogen Direct Injection in a Constant Volume Combustion Chamber

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