Effects of initial mixture temperature and pressure on laminar burning velocity and Markstein length of ammonia/air premixed laminar flames

Kanoshima, Ryuhei; Hayakawa, Akihiro; Kudo, Tetsuichi; Okafor, Ekenechukwu C.; Colson, Sophie; Ichikawa, Akinori; Kudo, Taku; Kobayashi, Haruo

doi:10.1016/j.fuel.2021.122149

Cited by 79 publications

(25 citation statements)

References 42 publications

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“…Figure 4 shows the relationship between the unstretched laminar burning velocity measured in the present study and the water vapor dilution ratio. The figure also shows the unstretched laminar burning velocity measured by Kanoshima et al 15 for a high-temperature ammonia/air premixed flame (Z Hd 2 O = 0) (open symbols) and the results of numerical simulations based on each reaction mechanism. For all of the examined initial mixture pressure conditions, the unstretched laminar burning velocity decreased with an increasing water vapor dilution ratio.…”

Section: Experimental and Numerical Results For Thementioning

confidence: 99%

“…) is the flame front area. Equation 5 was used to calculate the flame speed with no influence on the flame stretch 15 for hightemperature and high-pressure ammonia/air premixed flames. In addition, Okafor et al 13 used this nonlinear equation for flames with an effective Lewis number close to 1 and calculated appropriate values.…”

Section: Experimental Setup and Methodsmentioning

confidence: 99%

“…Figure 9 shows the burnt gas Markstein length, L b , measured in the present study as a function of the water vapor dilution ratio. The figure also shows a plot of the Markstein length measured by Kanoshima et al 15 for a hightemperature ammonia/air premixed flame (open symbols). Irrespective of the initial pressure, the Markstein length increased with an increasing water vapor dilution ratio.…”

Section: Kinetic Effectmentioning

confidence: 96%

“…It is known that the combustion characteristics of ammonia are weak, , i.e., lower flame temperature and slower laminar burning velocity, and water addition is expected to be even weaker than those combustion characteristics. Previously, in our research group, not only was the laminar burning velocity of ammonia mixtures clarified, − but the product gas characteristics of pure ammonia/air flames and ammonia/methane/air flames were also clarified. , It is expected that the laminar burning velocity of an ammonia flame becomes much weaker by water addition. However, the influence of vapor addition to an ammonia flame should be experimentally clarified to verify how the water addition changes the flame characteristics.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Water Vapor Dilution on the Laminar Burning Velocity and Markstein Length of Ammonia/Water Vapor/Air Premixed Laminar Flames

et al. 2022

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Since the Industrial Revolution, large amounts of ammonia have been synthesized by the Haber–Bosch process and used as fertilizer and chemical materials. Nitrogen fixation by industrial processes has contributed to the development of human society. However, a serious concern about the nitrogen cycle has been pointed out from the viewpoint of the planetary boundary. The planetary boundary quantifies the allowable limit to maintain a sustainable environment. This nitrogen cycle, which includes the limit of the biogeochemical flow boundary, was suggested to exceed the limits and to pose a serious environmental pollution issue. Therefore, a nitrogen cycle in which nitrogen compounds are collected from the environment and released into the atmosphere has recently been proposed. In this cycle, ammonia–water needs to be processed appropriately. In addition to the standpoint of the planetary boundary, ammonia–water is focused as a fuel that is able to be handled more safely. To design combustion systems that use ammonia–water, its fundamental combustion characteristics need to be elucidated. The objective of the present study is to clarify the effects of water vapor dilution on the laminar flame characteristics of ammonia/water vapor/air premixed flames. A propagating flame in a constant-volume chamber was observed to determine the laminar burning velocity and Markstein length for ammonia/water vapor/air premixed flames for various water vapor dilution ratios. The laminar burning velocity decreased and the Markstein length increased with an increasing water vapor dilution ratio. The effects of water vapor dilution on the laminar burning velocity for ammonia flames were also investigated by numerical calculations. The numerical results show that the decrease in the temperature is the dominant factor of the decrease in the laminar burning velocity with an increase in the water vapor dilution ratio. This study contributes to the understanding of the effects of water vapor dilution on the laminar flame characteristics of ammonia flames up to elevated pressure conditions.

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Section: Experimental and Numerical Results For Thementioning

confidence: 99%

Section: Experimental Setup and Methodsmentioning

confidence: 99%

Section: Kinetic Effectmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Effects of Water Vapor Dilution on the Laminar Burning Velocity and Markstein Length of Ammonia/Water Vapor/Air Premixed Laminar Flames

et al. 2022

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“…The rate of laminar burning increases as the initial temperature rises. Kanoshima et al [49] investigated the LBV of ammonia/air mixtures in a CVC over a range of temperatures (400 K-500 K), equivalency ratios (0.8-1.2), and beginning pressures (1-5 bar). The temperature exponent of the ammonia/air flames was found to be higher than the methane/air flames.…”

Section: Initial Temperaturementioning

confidence: 99%

Flame Speed and Laminar Burning Velocity in Syngas/Air Mixtures: A Review

Mahdi¹,

Al-Dulaimi²

2022

I2M

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Flame speed and laminar burning velocity (LBV) are important properties of fuel combustion. Both have an impact on how combustion systems are designed and operated. As a result, understanding how LBV and flame speed fluctuate as a function of thermodynamic conditions is critical for understanding the impact of practical applications in all combustion systems. Working pressures and temperatures are far higher than those found in the environment. Several studies on flame speed and LBV have been conducted. This study, however, includes a thorough literature analysis of approaches and procedures used to measure these two parameters, as well as the effects of operational factors for various fuels, with a focus on biofuels, for the sake of review simplicity.

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Developing a versatile detail mechanism for NH3 combustion

Kwon,

2024

J Mech Sci Technol

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Effects of initial mixture temperature and pressure on laminar burning velocity and Markstein length of ammonia/air premixed laminar flames

Cited by 79 publications

References 42 publications

Effects of Water Vapor Dilution on the Laminar Burning Velocity and Markstein Length of Ammonia/Water Vapor/Air Premixed Laminar Flames

Effects of Water Vapor Dilution on the Laminar Burning Velocity and Markstein Length of Ammonia/Water Vapor/Air Premixed Laminar Flames

Flame Speed and Laminar Burning Velocity in Syngas/Air Mixtures: A Review

Developing a versatile detail mechanism for NH3 combustion

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