Combustion analysis of a stratified pre-chamber ignition system by means of a zero-dimensional turbulence and flame speed model

This paper examines safety concerns related to flame speeds when warm relief gas snuffs out the pilot at the flare stack and pulls in ambient air and a spark ignites the vapor in the header. The flame speed essentially determines if the propagating flame speed is a deflagration or a detonation based on whether its subsonic or supersonic. While pipes are sized for deflagrations, they need to be analyzed and tested for detonation pressures and temperatures. Transient CFD calculations help determine the flame speeds, deflagration to detonation transition, pressures and temperatures are compared to pipe specifications and help determine if a detonation leads to a Loss of Containment and suggests mitigations.

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Quantifying the role of Darrieus–Landau instability in turbulent premixed flame speed determination at various burner sizes

Physics of Fluids ◽

10.1063/5.0032587 ◽

2021 ◽

Vol 33 (2) ◽

pp. 025104

Author(s):

Xin Wang ◽

Xiaobei Cheng ◽

Hao Lu ◽

Yishu Xu ◽

Yang Liu ◽

...

Keyword(s):

Flame Speed ◽

Premixed Flame ◽

Turbulent Premixed Flame ◽

Landau Instability ◽

Turbulent Premixed

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Diagnostics of automotive ignition system in operating conditions

2020 ELEKTRO ◽

10.1109/elektro49696.2020.9130258 ◽

2020 ◽

Author(s):

Milan Sebok ◽

Matej Kubis ◽

Miroslav Gutten ◽

Matej Kucera ◽

Tomasz N. Koltunowicz ◽

...

Keyword(s):

Operating Conditions ◽

Ignition System

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Comparison of performance and combustion analysis of a VCR SI engine using audio transducers

Materials Today Proceedings ◽

10.1016/j.matpr.2021.02.603 ◽

2021 ◽

Author(s):

Suresh Shetty ◽

Aneesh Jose ◽

Shrinivasa Rao B.R

Keyword(s):

Combustion Analysis ◽

Si Engine

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Evolution of Medieval Gunpowder: Thermodynamic and Combustion Analysis

ACS Omega ◽

10.1021/acsomega.1c03380 ◽

2021 ◽

Vol 6 (35) ◽

pp. 22848-22856

Author(s):

Tessy S. Ritchie ◽

Kathleen E. Riegner ◽

Robert J. Seals ◽

Clifford J. Rogers ◽

Dawn E. Riegner

Keyword(s):

Combustion Analysis

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Numerical Investigation of Pressure Influence on the Confined Turbulent Boundary Layer Flashback Process

Fluids ◽

10.3390/fluids4030146 ◽

2019 ◽

Vol 4 (3) ◽

pp. 146 ◽

Cited By ~ 2

Author(s):

Aaron Endres ◽

Thomas Sattelmayer

Keyword(s):

Boundary Layer ◽

Gas Turbines ◽

Separation Zone ◽

Turbulent Flame ◽

Pressure Rise ◽

Flame Speed ◽

Zone Size ◽

Detailed Chemical Kinetics ◽

Turbulent Flame Speed ◽

Quenching Distance

Boundary layer flashback from the combustion chamber into the premixing section is a threat associated with the premixed combustion of hydrogen-containing fuels in gas turbines. In this study, the effect of pressure on the confined flashback behaviour of hydrogen-air flames was investigated numerically. This was done by means of large eddy simulations with finite rate chemistry as well as detailed chemical kinetics and diffusion models at pressures between 0 . 5 and 3 . It was found that the flashback propensity increases with increasing pressure. The separation zone size and the turbulent flame speed at flashback conditions decrease with increasing pressure, which decreases flashback propensity. At the same time the quenching distance decreases with increasing pressure, which increases flashback propensity. It is not possible to predict the occurrence of boundary layer flashback based on the turbulent flame speed or the ratio of separation zone size to quenching distance alone. Instead the interaction of all effects has to be accounted for when modelling boundary layer flashback. It was further found that the pressure rise ahead of the flame cannot be approximated by one-dimensional analyses and that the assumptions of the boundary layer theory are not satisfied during confined boundary layer flashback.

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