Numerical Investigation of Spray Characteristics of Diesel Alternative Fuels

2012 ◽  
Author(s):  
Abbas Ghasemi ◽  
Kohei Fukuda ◽  
Ram Balachandar ◽  
Ronald Barron
Keyword(s):  
Numerical Investigation ◽  
Alternative Fuels ◽  
Spray Characteristics

scholarly journals Experimental investigation on spray characteristics of Jet A-1 and alternative aviation fuels

2021 ◽  
pp. 175682772110101
Author(s):  
Manish Kumar ◽  
Srinibas Karmakar ◽  
Sonu Kumar ◽  
Saptarshi Basu
Keyword(s):  
High Speed ◽  
Alternative Fuels ◽  
Droplet Formation ◽  
Spray Characteristics ◽  
Butyl Butyrate ◽  
Phase Doppler Interferometry ◽  
Alternative Aviation Fuels ◽  
Lower Viscosity ◽  
Fuel Jet ◽  
Atomization Characteristics

Potential alternative fuels that can mitigate environmental pollution from gas turbine engines (due to steep growth in the aviation sector globally) are getting significant attention. Spray behavior plays a significant role in influencing the combustion performance of such alternative fuels. In the present study, spray characteristics of Kerosene-based fuel (Jet A-1) and alternative aviation fuels such as butyl butyrate, butanol, and their blends with Jet A-1 are investigated using an air-blast atomizer under different atomizing air-to-fuel ratios. Phase Doppler Interferometry has been employed to obtain the droplet size and velocity distribution of various fuels. A high-speed shadowgraphy technique has also been adopted to make a comparison of ligament breakup characteristics and droplet formation of these alternative biofuels with that of Jet A-1. An effort is made to understand how the variation in fuel properties (mainly viscosity) influences atomization. Due to the higher viscosity of butanol, the SMD is higher, and the droplet formation seems to be delayed compared to Jet A-1. In contrast, the lower viscosity of butyl butyrate promotes faster droplet formation. The effects of the blending of these biofuels with Jet A-1 on atomization characteristics are also compared with that of Jet A-1.

Experimental Investigation of a Hybrid Atomizer’s Spray Characteristics in Variable Flow Condition by Using Alcohol Blended Diesel Fuel

2014 ◽  
Author(s):  
Amlan Garai ◽  
Sudeepta Mondal ◽  
Swarnendu Sen ◽  
Achintya Mukhopadhyay
Keyword(s):  
Experimental Investigation ◽  
Gas Turbine ◽  
Alternative Fuels ◽  
Air Flow ◽  
Cone Angle ◽  
Spray Characteristics ◽  
Spray Cone ◽  
Promising Alternative ◽  
Flow Rates ◽  
Air Streams

Heavy duty marine gas turbine combustors use diesel as fuel. One of the promising alternative fuels for gas turbine applications is ethanol, both in pure and blended form. The present work investigates spray characteristics of ethanol-blended diesel. A hybrid atomizer is selected for this experimental study where the fuel stream is sandwiched between two annular air streams. The air and fuel streams come into the atomizer tangentially and produce a high degree of swirl. Air inlets of the atomizer are varied in co and counter swirl directions with respect to the fuel inlet direction. Also the flow rates of the inner and outer air streams are varied during the process. With increase in flow rates of the air streams the turbulence increases. Spray ligament formation, ligament breakup and drop formation from the ligament are clearly visible during the experimental investigation. Breakup length, spray cone angle and spray pattern are major areas for analysis for understanding the nature of spray formation by an atomizer. Two back lights and a high speed camera are used for capturing the images of the spray. These images are used for analyzing the characteristics of the spray. The inner and outer air flow rates effectively influence the spray character of this atomizer. The air and fuel flow rates and swirl orientation play an important role for understanding the effect of the spray character by the air flow.

scholarly journals Numerical investigation of fuel flexibility in a small-scale flameless combustor

2021 ◽  
Vol 2116 (1) ◽  
pp. 012017
Author(s):  
P Rijo ◽  
P J Coelho
Keyword(s):  
Numerical Simulation ◽  
Natural Gas ◽  
Numerical Investigation ◽  
Equivalence Ratio ◽  
Alternative Fuels ◽  
Premixed Combustion ◽  
Small Scale ◽  
Combustion Mode ◽  
Geometrical Characteristics ◽  
Fuel Flexibility

Abstract Numerical simulation of a laboratory flameless combustor was performed to investigate the flexibility to burn alternative fuels to natural gas. The studied fuels are biogas, syngas and a mixture of ammonia and methane. The inlet temperatures of air and fuel, the equivalence ratio and the geometrical characteristics of the combustor were maintained constant. The results show that flameless combustion is observed in the biogas and in the NH3/CH4 mixture, while the syngas burns according to the conventional non-premixed combustion mode. According to the predictions, the biogas emits 1.1 ppm of NOx and 229 ppm of CO, syngas produces 7.8 ppm of NOx and 35 ppm of CO and the NH3/CH4 mixture emits about 3900 ppm of NOx and 608 ppm of CO. The high NOx and CO emissions in the NH3/CH4 mixture show that the combustor needs to be optimized to burn a nitrogen-containing fuel.

SPRAY VISUALIZATION OF HYDROTREATED VEGETABLE OIL UNDER SIMULATED DIESEL ENGINE CONDITION

2020 ◽  
Vol 40 (04) ◽  
Author(s):  
VO TAN CHAU
Keyword(s):  
Vegetable Oil ◽  
Diesel Fuel ◽  
Alternative Fuels ◽  
Cone Angle ◽  
Injection Pressure ◽  
Fuel Properties ◽  
Spray Characteristics ◽  
Spray Cone Angle ◽  
Penetration Length ◽  
Spray Cone

The diversity of alternative fuels and the corresponding variation in their physical and chemical properties, coupled with simultaneous changes in advanced techniques for CI-engine, needed to improve engine efficiency and emissions. Hydrotreated Vegetable Oil (HVO), seen as a promising substitution for petrol-diesel, and diesel fuel (mixed of 7% palm-biodiesel or B7) were analyzed on fuel properties. Then, the influence of these fuel properties on spray characteristics in constant volume combustion chamber were evaluated under conditions of single hole injector of 200m diameter, injection pressure of 100MPa, constant back pressure of 4.0MPa and energizing time of 2.5ms. The results show that HVO had smaller in viscosity (18.48%), density (5.52%), sulfur content, distillation under T50, T90 and higher in derived cetane index (27.2%), heating value (2.2%), respectively, compared to diesel. Spray characteristics of HVO had the same propensity with diesel fuel. HVO revealed a slightly shorter in penetration length (5%) during fully developed zone, a larger spray cone angle (from 0.2 to 1.1 degree wider in quasi-steady state). Both fuels had a similar maximum spray velocity reaching at 5mm to 10mm from nozzle orifice. Also observed was an increase in spray volume of HVO.

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