Characteristics of Spontaneous Ignition and Combustion in Unsteady High-Speed Gaseous Fuel Jets

Predicting the ignition delay of turbulent methane jets using Conditional Source-term Estimation

“…More recently, Ishiyama et al [4] used a similar procedure to repeat the work of Fraser et al in their own facility. Both studies used pressure measurements -either an increase past a threshold based on pre-ignition measurements [2,3] or a sudden change in the rate of pressure rise [4] -to identify ignition.…”

“…Subsequently, other studies have used the same facility to explore several parameters potentially affecting the ignition delay, including the ambient pressure, temperature, and composition of the fuel mixture [3]. More recently, Ishiyama et al [4] used a similar procedure to repeat the work of Fraser et al in their own facility. Both studies used pressure measurements -either an increase past a threshold based on pre-ignition measurements [2,3] or a sudden change in the rate of pressure rise [4] -to identify ignition.…”

Investigation of the combustion process of hydrogen jets under argon-circulated hydrogen-engine conditions

“…The combustion chamber, illustrated schematically in Fig. 1 , was built in a manner similar to that reported in previous studies [25,26] . The chamber is a circular cylinder measuring 80 mm in diameter and 30 mm in depth and is approximately 150 cm 3 in volume; in addition, it is fitted with a quartz window for viewing.…”

“…The variation in d q /d t depends on the ignition delay, fuel properties, and injection and combustion conditions; d q /d t for a constant-volume combustion vessel is calculated from the energy equation with enthalpy variation due to heat transfer and fuel injection. The definition of the ignition delay of gaseous fuels was previously described in detail by Ishiyama et al [25] and Naber et al [29] . In both studies, the ignition delay was defined as the time from the SOI to the time at which the pressure rise exceeds a set value.…”

CFD analysis of a high‐speed unsteady jet

“…Shadowgraph visualization was applied to natural gas and hydrogen jets in order to investigate the development of unsteady jets, and the effects of the injection pressure and nozzle size were discussed [4]. In addition, air entrainment was estimated based on the self-similarity theory, and the optimum injection condition was discussed in comparison with liquid spray fuel injection, which is usually used in diesel engines [5]. The velocity distribution of the surrounding air was measured by means of particle image velocimetry, and the entrainment was estimated quantitatively [6].…”