Puffing and Micro-Explosion Behavior in Combustion of Butanol/Jet A-1 and Acetone-Butanol-Ethanol (A-B-E)/Jet A-1 Fuel Droplets

Rao, D. Chaitanya Kumar; Karmakar, Srinibas; Som, S. K.

doi:10.1080/00102202.2017.1333502

Cited by 52 publications

(20 citation statements)

References 44 publications

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“…Both neat B and ABE have a lower boiling point, lower viscosity and higher vapour pressure compared to neat diesel, which improves the vaporisation and atomisation rate. Rao et al [37] investigated the droplets fragmentation behaviour of three blend ratios (10%, 30% and 50%) of B and ABE blended with jet A-1 fuel. The fragmentation of droplets plays a major factor in increasing atomization and vaporization rate, which can lead to efficient combustion.…”

Section: Introductionmentioning

confidence: 99%

The Impact of Injector Hole Diameter on Spray Behaviour for Butanol-Diesel Blends

2018

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Optimising the combustion process in compression ignition (CI) engines is of interest in current research as a potential means to reduce fuel consumption and emission levels. Combustion optimisation can be achieved as a result of understanding the relationship between spraying technique and combustion characteristics. Understanding macroscopic characteristics of spray is an important step in predicting combustion behaviour. This study investigates the impact of injector hole diameter on macroscopic spray characteristics (spray penetration, spray cone angle, and spray volume) of butanol-diesel blends. In the current study, a Bosch (0.18 mm diameter) and a Delphi (0.198 mm) injector were used. Spray tests were carried out in a constant volume vessel (CVV) under different injection conditions. The test blends were injected using a solenoid injector with a common rail injection system and images captured using a high-speed camera. The experimental results showed that the spray penetration (S) was increased with larger hole diameter. Spray penetration of a 20% butanol-80% diesel blend was slightly further than that of neat diesel. Spray penetration of all test fuels was increased as a result of increased injection pressure (IP), while spray cone angle (θ) was slightly widened due to the increase in either hole diameter or injection pressure. Spray volume of all test fuels was increased as a result of increased hole diameter or injection pressure. Thus, an efficient diesel engine performance can be achieved as a result of controlling injection characteristics, especially when using a promising additive like butanol blended with diesel.

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Section: Introductionmentioning

confidence: 99%

The Impact of Injector Hole Diameter on Spray Behaviour for Butanol-Diesel Blends

2018

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“…As discussed before, puffing and micro-explosion occur due to the collapse of a bubble, whereas an abrupt explosion takes place without any noticeable bubble inside the droplet and leads to complete disintegration of parent droplet. Since this phenomenon was not observed in our previous work [37] where butanol and A-B-E were blended with Jet A-1, it seems that the sudden explosion arises due to the limited miscibility of the blends. It can be inferred that due to limited nucleation sites, the microscopic bubbles do not coalesce to grow further.…”

Section: Photographic Sequences and Regression Profiles Of Burning Drmentioning

confidence: 80%

“…The characteristic features of the disruptive burning in ethanol/Jet A-1 blends are highlighted in Table 3. Similar to the combustion characteristics of butanol/Jet A-1 blends [37], an increase in the proportion of ethanol enhances the probability of micro-explosion and hence reduces the average droplet lifetime in ethanol/Jet A-1 blends. It is also noticed that the average droplet lifetime of ethanol/Jet A-1 blends is appreciably lower than that of butanol/Jet A-1 blends for the same blending proportion.…”

Section: Photographic Sequences and Regression Profiles Of Burning Drmentioning

confidence: 90%

“…Figure 7 (a) represents a typical burning sequence of E30 droplet where the vapor bubble grows and collapses repetitively. The disruption created by puffing generates a turbulence inside the droplet which in turn supports the formation of more nucleation sites [26,37,42]. Since the presence of a vast number of nucleation sites leads to the formation of a bigger bubble, the vapor bubble breaks apart at 320 ms.…”

Section: Photographic Sequences and Regression Profiles Of Burning Drmentioning

confidence: 99%

“…The numerical model was also used to characterize the onset of micro-explosion for binary and tertiary fuel droplets. More recently, in our previous work, an experimental investigation was performed to study the puffing and micro-explosion events in butanol/Jet A-1 and A-B-E/Jet A-1 fuel droplets [37]. The onset of micro-explosion was characterized by normalized squared onset diameter (NOD), and it was found that NOD is almost similar for butanol blends and A-B-E blends.…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigations on nucleation, bubble growth, and micro-explosion characteristics during the combustion of ethanol/Jet A-1 fuel droplets

Rao

Syam

Karmakar

et al. 2017

Experimental Thermal and Fluid Science

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The combustion characteristics of ethanol/Jet A-1 fuel droplets having three different proportions of ethanol (10%, 30%, and 50% by vol.) are investigated in the present study. The large volatility differential between ethanol and Jet A-1 and the nominal immiscibility of the fuels seem to result in combustion characteristics that are rather different from our previous work on butanol/Jet A-1 droplets (miscible blends). Abrupt explosion was facilitated in fuel droplets comprising lower proportions of ethanol (10%), possibly due to insufficient nucleation sites inside the droplet and the partially unmixed fuel mixture. For the fuel droplets containing higher proportions of ethanol (30% and 50%), micro-explosion occurred through homogeneous nucleation, leading to the ejection of secondary droplets and subsequent significant reduction in the overall droplet lifetime. The rate of bubble growth is nearly similar in all the blends of ethanol; however, the evolution of ethanol vapor bubble is significantly faster than that of a vapor bubble in the blends of butanol. The probability of disruptive behavior is considerably higher in ethanol/Jet A-1 blends than that of butanol/Jet A-1 blends. The Sauter mean diameter of the secondary droplets produced from micro-explosion is larger for blends with a higher proportion of ethanol. Both abrupt explosion and micro-explosion create a large-scale distortion of the flame, which surrounds the parent droplet. The secondary droplets generated from abrupt explosion undergo rapid evaporation whereas the secondary droplets from micro-explosion carry their individual flame and evaporate slowly. The growth of vapor bubble was also witnessed in the secondary droplets, which leads to the further breakup of the droplet (puffing/micro-explosion).

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Combustion characteristics of butanol‐ Jet A‐1 fuel blends in a swirl‐stabilized combustor under the influence of preheated swirling air

Kumar

Chong

Karmakar

2021

Intl J of Energy Research

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Biofuels are carbon-neutral alternative fuels, which have emerged as an important source of energy for the aviation industry to reduce greenhouse gas emissions. Butanol is considered an emerging biofuel with properties that are suited for application in gas turbine engines. It is traditionally produced through the fermentation process of biomass (acetone-butanol-ethanol fermentation). To examine the feasibility of butanol as operating fuel, the combustion characteristics of butanol and butanol/Jet A-1 blends are examined in a labscale swirl stabilized burner, with emphasis on the effect of preheating because of the variation of inlet air temperature during flight operation. To rich the constant air temperature to 150 C, the incoming air (main air) is preheated and investigated for various equivalence ratios. Compared to neat Jet A-1, the flames of the butanol/Jet A-1 blends have shown a better effect on global emission characteristics with comparable temperature distribution on adding butanol to Jet A-1. A 50% butanol-loaded blends show a reduction of 29% CO and 24% NOx compared to neat Jet A-1 whereas 30% loading follows a similar trend, and the pollutant emission is slightly higher than the 50% blend case.Additionally, both 30% and 50% butanol blends show a comparable flame temperature distribution, which is higher than neat Jet A-1.

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Puffing and Micro-Explosion Behavior in Combustion of Butanol/Jet A-1 and Acetone-Butanol-Ethanol (A-B-E)/Jet A-1 Fuel Droplets

Cited by 52 publications

References 44 publications

The Impact of Injector Hole Diameter on Spray Behaviour for Butanol-Diesel Blends

The Impact of Injector Hole Diameter on Spray Behaviour for Butanol-Diesel Blends

Experimental investigations on nucleation, bubble growth, and micro-explosion characteristics during the combustion of ethanol/Jet A-1 fuel droplets

Combustion characteristics of butanol‐ Jet A‐1 fuel blends in a swirl‐stabilized combustor under the influence of preheated swirling air

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