Analysis of Combustion Characteristics When Adding Hydrogen and Short-Chain Hydrocarbons to RP-3 Aviation Kerosene Based on the Variation Disturbance Method

Abstract

Hydrogen and five short-chain hydrocarbons are mixed with RP-3 aviation kerosene (RP-3) to study their blending effects on the combustion of RP-3. Seven combustion characteristics, the ignition delay time, burnout time, adiabatic flame temperature, extinction temperature, rate of production of hydroxyl radicals, laminar flame speed, and extinction strain rate, are simulated in four different reactors. The simulated data are preprocessed to match the requirements for a variation disturbance method proposed in this paper, and then the disturbance is obtained for representing the total influence of hydrogen and five short-chain hydrocarbons blending on the combustion properties of RP-3. The results show that H2, CH4, and C2H4 have a greater degree of disturbance to RP-3. In contrast, the influence of C3H6 is the weakest. The rate of disturbance shows that H2 and C2H4 have a positive effect on each of the combustion characteristics, and especially, C2H4 plays a promoting role in the combustion performance of RP-3. The reaction paths of seven fuels are analyzed by time-integrated element flux analysis, and the viability and rationality of the variation disturbance method are supported by the calculation of branching ratios of six main reaction channels.

Gas-Phase Pyrolysis Characteristics of Hydrocarbon Fuels and Their Potential Impacts on Combustion Operational Performance

“…The results agree with observations in the aforementioned supercritical pyrolysis study. These findings suggest that increased yields of hydrocarbon species with shorter ignition delay times are beneficial for fuel LBO performance, which is consistent with the improved LBO performance as a function of fuel DCN. − The observed impact of ethylene yields on fuel LBO qualitatively agrees with a combustion simulation study conducted by Li and co-workers . Li et al showed that the addition of ethylene to RP-3 (Chinese commercial jet fuel) improved several of its combustion characteristics, including ignition delay, laminar flame speed, and extinction rate.…”

“…6−8 The observed impact of ethylene yields on fuel LBO qualitatively agrees with a combustion simulation study conducted by Li and coworkers. 24 Li et al showed that the addition of ethylene to RP-3 (Chinese commercial jet fuel) improved several of its combustion characteristics, including ignition delay, laminar flame speed, and extinction rate. In addition, the simulated combustion study showed a negative impact on RP-3 combustion performance with the addition of methane (reduced laminar flame speed and increased ignition delay).…”

Effects of Ethanol and Methanol on the Combustion Characteristics of Gasoline with the Revised Variation Disturbance Method

“…This method eliminates the effects of the numerical scales and dimensions of combustion characteristics and quantifies the effects of blending components by the coefficient of variation. 41 To better describe the extent of effects of blending agents on the overall combustion performance of primary fuels, this paper proposes a new disturbance based on the concept of coefficient of variation and the experience of research on combustion dynamics. This quantity can be used to quantitatively characterize the extent of effects of blending fuels on the combustion performance of primary fuels and comprehensively analyze the disturbance to each combustion characteristic.…”

“…The authors first proposed the variation disturbance method in 2019 based on the concept of coefficient of variation. This method eliminates the effects of the numerical scales and dimensions of combustion characteristics and quantifies the effects of blending components by the coefficient of variation . To better describe the extent of effects of blending agents on the overall combustion performance of primary fuels, this paper proposes a new disturbance based on the concept of coefficient of variation and the experience of research on combustion dynamics.…”