Flame Spread and Group-Combustion Excitation in Randomly Distributed Droplet Clouds with Low-Volatility Fuel near the Excitation Limit: a Percolation Approach Based on Flame-Spread Characteristics in Microgravity

Indonesia has implemented a policy of using diesel fuel containing 20 percent biofuel (commonly known as B20 biodiesel), as stated in Energy and Mineral Resources Ministerial Decree No. 23/2013. This study investigated the flame-spread characteristics of biodiesel (B20) in a microgravity environment through drop tower facilities. This is due to the difficulty in creating droplet sizes similar to the real liquid sprays in the combustion chamber of diesel engines. The experiment used biodiesel (B20) droplets with a diameter 1 mm. The results show that the biodiesel (B20) droplets have characteristics of a flame-spread limit distance S BC /d C0limit = 7. This paper discusses the characteristics of biodiesel (B20) droplets in detail.

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“…2 ) and flame-spread rate (V fBC d C0 ) (Mikami et al, 2018). The t fBC /d C0 2 and V fBC d C0 was measured at various droplets spacing i.e.…”

Section: Flame-spread Flame-spread Time and Rate Of Biodiesel (B20) Dropletmentioning

confidence: 99%

“…Simulations were conducted to reveal large-scale flame-spread behavior. Saputro et al, (2017) and Mikami et al, (2018) simulated the n-decane droplet of flame spread behavior on a large scale by using the percolation approach. This research attempts to explore the behavior of Biodiesel B20 droplet combustion in microgravity conditions.…”

Section: Introductionmentioning

confidence: 99%

Flame-spread behavior of biodiesel (B20) in a microgravity environment

Saputro

Fitriana

Munir

et al. 2020

JTST

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“…The continuation research on the individual droplet is multiple-droplet combustion, which studies the interactions of arrays or clouds of burning droplets in different spacing to link isolated droplet results to the combustion of spray. The experiment on the multipledroplet combustion such as: 1) Study on two droplet combustion [6][7][8], study on droplet array combustion [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Study experimental of flame-spread rate and spread limit distance of bio-solar droplets in microgravity combustion

et al. 2018

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The most important issues in spray combustion science are how to understand the mechanism of the combustion of liquid fuel spray, especially in the flame-spread phenomenon. In spray combustion, combustion is the existence of the group is very important in order to obtain the stable combustion. Therefore, the flame spread among fuel droplets affects the occurrence of stable combustion in the spray combustion engine. This study was focused on phenomenon on diesel combustion engines. This research was conducted to study the behavior of flame spread rate of flame spread and limit the distance of bio-diesel liquid droplets. This research method was used experimental research. Microgravity condition was Obtained through the free fall tower with the height of the tower used is 6 m. Observed droplets suspended was placed on SiC fibers with different distance and droplet size 1 mm. This study observed Also the influence of the flame propagation direction of the burning droplet to the next burning droplets that lies in the direction and perpendicular to the direction of the flame propagation. The results showed that the bio-diesel fuel droplet Igniter (I) could burn next droplet (A)at a distance (S/d0) = 8.

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“…Mikami et al 8) extended the Oyagi's work to study the effect of flame-spread direction from two-droplet interactive combustion on the flame-spread limit using droplet-cloud elements with uneven droplet spacing. They introduced the droplet-cloud element model as a basic element of a randomly distributed droplet cloud at the critical condition for group combustion occurrence in the percolation model 9) . They showed that the 90 deg.-direction flame-spread-limit distance with two-droplet interactive combustion is greater than the 0 deg.-direction flame-spread-limit distance.…”

Section: Introductionmentioning

confidence: 99%

Flame-Spread Characteristics of Droplet-Cloud Element with Two-Droplet Interaction at High Pressure in Microgravity

Iwai

Yoshida

Motomatsu

et al. 2018

AEROSPACE TECHNOLOGY JAPAN

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Spray combustion is widely used in gas turbines, diesel engines, jet engines, boiler and oil-fired heaters. It is indispensable for life and industry. In order to improve understanding of the flame-spread mechanism in the fuel sprays, many researchers have conducted microgravity experiments on the flame-spread of fuel-droplet arrays and droplet-cloud elements. The effect of ambient pressure on the flame-spread phenomena has also been investigated. This research involves microgravity experiments being conducted on the flame spread over droplet-cloud elements at high-pressure condition. The droplet-cloud element consists of three droplets, Droplets B, A and L. Droplets B and A are interactive droplets. Droplet L is the droplet to investigate the characteristics of flame spread from Droplet A. The results suggest that interactive combustion between Droplets B and A increases the flame-spread-limit distance from Droplet A to Droplet L at 200 kPa. The 1200 K position of the thermal layer around Droplet A also increases with the interactive combustion. This research also conducted the flame spread to Droplet L in the perpendicular direction, y-direction, to the direction from Droplet B to Droplet A, xdirection. The results suggest that interactive combustion between Droplets B and A increases the y-direction flame-spreadlimit distance to Droplet L more than the x-direction flame-spread-limit distance.

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Flame Spread and Group-Combustion Excitation in Randomly Distributed Droplet Clouds with Low-Volatility Fuel near the Excitation Limit: a Percolation Approach Based on Flame-Spread Characteristics in Microgravity

Cited by 17 publications

References 22 publications

Flame-spread behavior of biodiesel (B20) in a microgravity environment

Flame-spread behavior of biodiesel (B20) in a microgravity environment

Study experimental of flame-spread rate and spread limit distance of bio-solar droplets in microgravity combustion

Flame-Spread Characteristics of Droplet-Cloud Element with Two-Droplet Interaction at High Pressure in Microgravity

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