The Effect of Heavy Working Fluids on Hydrogen Combustion

Shahsavan, Martia; Mack, J. Hunter

doi:10.31224/osf.io/94s8d

Cited by 6 publications

(3 citation statements)

References 21 publications

(21 reference statements)

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“…To address these concerns, combustion systems have evolved over time, implementing a wide variety of approaches. Fuels are broadly utilized in premixed [1][2][3][4] and non-premixed combustion [5][6][7][8][9] using gas turbines and different forms of internal combustion (IC) engines such as spark ignition (SI) [10][11][12], homogeneous charge compression ignition (HCCI) [13][14][15], and reactivity controlled compression ignition (RCCI) [16,17]. Natural gas, as one of the cleanest fossil fuels, is one of the main sources of energy production and electricity generation in the United States and abroad.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Effect of Electrode Surface Roughness on Spark Ignition

Morovatiyan

Shahsavan

Shen

et al. 2018

Volume 1: Large Bore Engines; Fuels; Advanced Combustion

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Lean-burn engines are important due to their ability to reduce emissions, increase fuel efficiency, and mitigate engine knock. In this study, the surface roughness of spark plug electrodes is investigated as a potential avenue to extend the lean flammability limit of natural gas. A nano-/micro-morphology modification is applied on surface of the spark plug electrode to increase its surface roughness. High-speed Z-type Schlieren visualization is used to investigate the effect of the electrode surface roughness on the spark ignition process in a premixed methane-air charge at different lean equivalence ratios. In order to observe the onset of ignition and flame kernel behavior, experiments were conducted in an optically accessible constant volume combustion chamber at ambient pressures and temperatures. The results indicate that the lean flammability limit of spark-ignited methane can be lowered by modulating the surface roughness of the spark plug electrode.

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Section: Introductionmentioning

confidence: 99%

Investigation of the Effect of Electrode Surface Roughness on Spark Ignition

Morovatiyan

Shahsavan

Shen

et al. 2018

Volume 1: Large Bore Engines; Fuels; Advanced Combustion

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“…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]. In another study, penetration length, cone angle, mixedness, and flame properties have been extensively studied for hydrogen injection into different working fluids by numerical modeling, indicating that replacing nitrogen with argon and xenon can dramatically change the jet development in the chamber [13].…”

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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“…Constant volume combustion chambers (CVCC) are typically used in order to investigate fundamental aspects of combustion phenomena such as premixed ignition [1][2], diffusion flames, laminar flame speed [3], turbulent flame speed, autoignition [4][5], injection strategies [6][7][8], and emissions formation [9]. In this study, a small test stand is placed at the bottom of the cylindrical CVCC for conducting materials synthesis experiments, initially focused on the creation of paper-templated metals.…”

Section: Introductionmentioning

confidence: 99%

Development of a Constant Volume Combustion Chamber for Material Synthesis

Morovatiyan¹,

Shahsavan²,

Mack³

2018

Preprint

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A constant volume combustion chamber (CVCC) was constructed to enable material synthesis procedures that are sensitive to temperature, pressure, and ambient species concentrations. Material synthesis processes require specific operating conditions in order to carry out the desired chemical reactions and property transformations, including the creation of paper-templated metals and nanoparticles. The 1.13 liter combustion chamber includes a test stand for conducting the material synthesis experiments. A premixed fuel-air mixture is ignited at a desired equivalence ratio in order to produce the required synthesis conditions. In comparison to furnaces and ovens, this approach provides greater flexibility for materials synthesis procedures. Computational modeling using adaptive mesh refinement, alongside preliminary experimental testing results, confirms that the CVCC can provide the appropriate conditions to synthesize paper-templated metals. The approach demonstrates that the CVCC can be a viable alternative to a furnace for use in materials synthesis applications.

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The Effect of Heavy Working Fluids on Hydrogen Combustion

Cited by 6 publications

References 21 publications

Investigation of the Effect of Electrode Surface Roughness on Spark Ignition

Investigation of the Effect of Electrode Surface Roughness on Spark Ignition

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

Development of a Constant Volume Combustion Chamber for Material Synthesis

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