Study on the laminar burning velocity of ethanol/RP-3 aviation kerosene premixed flame

Liu, Yu; Gu, Wu; Wang, Jinduo; Rao, D. Chaitanya Kumar; Chen, Xiaoxiao; Ma, Haihong; Zeng, Wen

doi:10.1016/j.combustflame.2021.111921

Cited by 20 publications

(7 citation statements)

References 37 publications

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“…Bioethanol (or bioethanol/kerosene blends) can be used not only in jet engines but also in pulse engines for aerospace applications [32]. The work by Liu and others illustrates how ethanol biofuel uniquely addresses two pressing challenges: oil security and CO 2 emissions [33]. Given the aviation industry's heavy reliance on imported kerosene, securing a stable and sustainable supply of oil is of paramount importance while also reducing carbon emissions to meet stringent environmental sustainability targets.…”

Section: Introductionmentioning

confidence: 99%

Impact of Bioethanol Concentration in Gasoline on SI Engine Sustainability

Rimkus,

Pukalskas,

Mejeras

et al. 2024

Sustainability

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This study presents an experimental investigation into the impact of blending bioethanol (E100) with conventional gasoline (E0), incrementally increasing biofuel levels up to E10, E50, and E70. The test was carried out in two stages: Stage I assessed the engine’s performance under fixed speeds (n = 2000 rpm and n = 2500 rpm) and fixed throttle positions (15%, 20%, and 25%) to measure changes in engine torque, efficiency, and environmental metrics by varying the concentration of bioethanol in the fuel. Stage II aimed to enrich the initial findings by conducting an additional test, running the engine at a fixed speed (n = 2000 rpm) and braking torque (MB = 80 Nm) and varying the ignition timing. Results indicated slight improvements in engine brake torque and thermal efficiency (up to 1.7%) with bioethanol content increased to 70%, and a notable reduction in incomplete combustion byproducts—carbon monoxide and hydrocarbons emissions (up 15% and 43%). Nitrogen oxide emissions were reduced by up to 23%, but carbon dioxide emissions decreased by a mere 1.1%. In order to increase thermal efficiency by adding higher bioethanol blend concentrations, adjusting the ignition timing to counter the longer ignition delay is necessary; however, higher emissions of nitrogen oxides and hydrocarbons are a major drawback of such a strategy. The results of the research are important in determining the optimal concentration of bioethanol in the mixture with gasoline for the energy and environmental sustainability of a spark ignition engine.

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Section: Introductionmentioning

confidence: 99%

Impact of Bioethanol Concentration in Gasoline on SI Engine Sustainability

Rimkus,

Pukalskas,

Mejeras

et al. 2024

Sustainability

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“…The reduction of carbon emissions is paramount for ensuring the sustainable development of the aviation industry [1,2]. According to the 77th IATA Annual General Meeting, IATA has committed itself to achieving Fly Net Zero by 2050.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Emission Properties of Sustainable Aviation Fuels and Conventional Aviation Fuels: A Review

Song,

Li,

Liu

2024

Applied Sciences

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In order to achieve the International Air Transport Association’s (IATA) goal of achieving net-zero emissions in the aviation industry by 2050, there has been a growing emphasis globally on the technological development and practical application of sustainable aviation fuels (SAFs). Discrepancies in feedstock and production processes result in differences in composition between SAFs and traditional aviation fuels, ultimately affecting the emission performance of the two types of fuel. This paper discusses the impact of CO2/NOx/SO2/CO/PM/UHC emissions from the aviation industry on the natural environment and human health by comparing the two types of fuel under the same conditions. Fuel combustion is a complex process in the combustor of an engine, which transfers chemical energy into heat energy. The completeness of combustion is related to the fuel properties, including spray, evaporation, and flammability. Therefore, engine performance is not only affected by fuel performance, but also interacts with engine structure and control laws. The CO2 emissions of SAFs differ significantly from traditional aviation fuels from a lifecycle analysis perspective, and most SAFs can reduce CO2 emissions by 41–89%. Compared with traditional aviation fuels, SAFs and blended fuels can significantly reduce SO2 and PM emissions. Pure Fischer–Tropsch hydroprocessed synthesized paraffinic kerosine (FT-SPK) can reduce SO2 and PM emissions by 92% and 70–95% respectively, owing to its extremely low sulfur and aromatic compound content. In contrast, the differences in NOx emissions between the two types of fuel are not significant, as their generation mechanisms largely stem from thermal drive and turbulent flow in the combustor, with emissions performance being correlated to power output and flame temperature profile in engine testing. CO and UHC emissions are related to engine operating conditions and the physical/chemical properties of the SAFs, with no significant upward or downward trend. Therefore, SAFs have significant advantages over conventional aviation fuels in terms of CO2, SO2, and PM emissions, and can effectively reduce the hazards of aviation to the environment and human health.

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“…For example, in Brazil, ethanol has been used as a land transportation fuel for more than 30 years, and in the near future, the government is expected to approve ethanol as an aviation fuel [6]. In China, Liu et al [7] studied ethanol/RP-3 aviation kerosene blended fuel and focused on the effect of ethanol addition on the laminar burning velocity (LBV) of RP-3. What is more, they point out that the use of ethanol or ethanol/kerosene blends in aero-engines is still rare at present.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Studies on the Explosion Characteristics of Ethanol–Air Mixtures under Aviation Conditions

Ning,

Zhang,

Zheng

et al. 2023

Fire

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As a representative renewable biofuel, ethanol can reduce mankind’s dependence on petroleum resources and the emission of greenhouse gases and other pollutants. In recent years, the application of ethanol in the aviation field has begun to be a concern of scholars. As ethanol is a flammable liquid, it is significant to study its explosion characteristics in aviation conditions from a safety perspective. In this work, at 20 kPa, the explosion characteristics of ethanol–air mixtures (concentration 6~12%) were experimentally and numerically studied under an initial temperature range of 303 K~363 K. The effects of the initial temperature and concentration on the maximum explosion pressure, maximum rate of pressure rise, explosion time, and fast burning time were analyzed. In addition, the heat loss fraction and sensitivity analysis were examined and discussed. The main conclusions are as follows: A linear relationship exists between the maximum explosion pressure and the reciprocal of the initial temperature. The maximum rate of a pressure rise appears to decrease or at least approach a constant value as the initial temperature increases. The explosion time is significantly dependent on the concentration. At a constant concentration, the proportions of heat loss are approximately constant except for 12%. In our sensitivity analysis, R1 (H + O2 <=> O + OH) was the dominant elementary reaction.

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Study on the laminar burning velocity of ethanol/RP-3 aviation kerosene premixed flame

Cited by 20 publications

References 37 publications

Impact of Bioethanol Concentration in Gasoline on SI Engine Sustainability

Impact of Bioethanol Concentration in Gasoline on SI Engine Sustainability

Comparison of Emission Properties of Sustainable Aviation Fuels and Conventional Aviation Fuels: A Review

Experimental and Numerical Studies on the Explosion Characteristics of Ethanol–Air Mixtures under Aviation Conditions

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