Effect of Injection Pressure and Air–Fuel Ratio on the Self-Ignition Properties of 1-Butanol–Diesel Fuel Blends: Study Using a Constant-Volume Combustion Chamber

This study has the purpose to consider a new ignition source in order to increase the inflammable limit of a gasoline engine at its lean region. To analyze flame propagation characteristics, a CVCC (constant volume combustion chamber) was produced, and three types of devices – conventional type, arc type, and jet type – were manufactured to conduct combustion testing. Experimental variables were the air/fuel ratio from 1.0 to 1.8 and charging pressure from 2 bar to 4 bar. The result of flame propagation analysis showed that the spread for jet type was faster than that of conventional type by 10 ms, and that of arc type by 5 ms. Result of combustion pressure experiment showed that, at air/fuel ratio of 1.0, arc type showed the highest value, with 22 bar, while jet type showed 19.4 bar and convention type was 17 bar. At maximum inflammable limit experiment, combustion was possible at jet type and arc type in an area above an air/fuel ratio of 1.8, but the conventional type showed miss fire, where combustion did not occur in the area above 1.6. The Study on new ignition source concluded that the jet type shows superior results in terms of combustion speed while the arc type is excellent in terms of combustion pressure.

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A Study on Spray and Combustion Characteristics of Biodiesel Blended Diesel Fuel in a Constant Volume Combustion Chamber

Journal of Energy Engineering ◽

10.5855/energy.2015.24.1.132 ◽

2015 ◽

Vol 24 (1) ◽

pp. 132-136

Author(s):

Hyun-Uk Suh ◽

Chung-Hwan Jeon

Keyword(s):

Combustion Chamber ◽

Diesel Fuel ◽

Combustion Characteristics ◽

Constant Volume ◽

Constant Volume Combustion ◽

Constant Volume Combustion Chamber

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Effect of Cylinder Air Pressure and Hot Surface Temperature on Ignition Delay of Diesel Spray in a Constant Volume Combustion Chamber

Energies ◽

10.3390/en12132565 ◽

2019 ◽

Vol 12 (13) ◽

pp. 2565

Author(s):

Mohammad Salman ◽

Sung Chul Kim

Keyword(s):

Combustion Chamber ◽

Diesel Engines ◽

Ignition Delay ◽

Strong Dependence ◽

Injection Pressure ◽

Constant Volume ◽

Fuel Additive ◽

Constant Volume Combustion ◽

Constant Volume Combustion Chamber ◽

Hot Surface

Present-day direct injection (DI) diesel engines with a high power density of displacement are not just promoting an expansion in the utilization of high-temperature resistant alloys in pistons yet, in addition, the expanded cylinder air pressures. When the temperature of the diesel engines piston exceeds a certain limit, it assumes a critical role at the start of sprays. The target of the present investigation was to look at the effects of cylinder air pressures (CAP) (10–25 bar) and high hot surface temperatures (HST) (350–450 °C). The ignition delay (ID) of pure diesel and that of diesel with Iftex clean system D (a cetane enhancer) are investigated experimentally. The experiments are performed by using a constant volume combustion chamber (CVCC) with a single hole pintle-type nozzle mounted on its head. A strong dependence of ID on the CAPs and HSTs was observed. A CAP of 25 bar is much inferior to the precombustion pressure of DI diesel engines; however, it is the case that combustion typical features are the same in spite of an inferior CAP, HST, and injection pressure. The ID tends to decrease to very small values with an increase in either of the two parameters. At a CAP of 25 bar, the measured ID of diesel with fuel additive is 45.8% lower than the pure diesel. Further, the ID of diesel with fuel additive at a 300 bar injection pressure and 25 bar CAP decreases at a rate of close to 0.2 ms/bar.

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