Shock tube studies of thermal radiation of diesel-spray combustion under a range of spray conditions |
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Authors: | T Tsuboi Y Kurihara M Takasaki R Katoh K Ishii |
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Institution: | (1) Department of Mechanical Engineering, Faculty of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya Yokohama, 240-8501, Japan |
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Abstract: | A tailored interface shock tube and an over-tailored interface shock tube were used to measure the thermal energy radiated
during diesel-spray combustion of light oil, α-methylnaphthalene and cetane by changing the injection pressure. The ignition
delay of methanol and the thermal radiation were also measured. Experiments were performed in a steel shock tube with a 7
m low-pressure section filled with air and a 6 m high-pressure section. Pre-compressed fuel was injected through a throttle
nozzle into air behind a reflected shock wave. Monochromatic emissive power and the power emitted across all infrared wavelengths
were measured with IR-detectors set along the central axis of the tube. Time-dependent radii where soot particles radiated
were also determined, and the results were as follows. For diesel spray combustion with high injection pressures (from 10
to 80 MPa), the thermal radiation energy of light oil per injection increased with injection pressure from 10 to 30 MPa. The
energy was about 2% of the heat of combustion of light oil at P
inj = about 30 MPa. At injection pressure above 30 MPa the thermal radiation decreased with increasing injection pressure. This
profile agreed well with the combustion duration, the flame length, the maximum amount of soot in the flame, the time-integrated
soot volume and the time-integrated flame volume. The ignition delay of light oil was observed to decrease monotonically with
increasing fuel injection pressure. For diesel spray combustion of methanol, the thermal radiation including that due to the
gas phase was 1% of the combustion heat at maximum, and usually lower than 1%. The thermal radiation due to soot was lower
than 0.05% of the combustion heat. The ignition delays were larger (about 50%) than those of light oil. However, these differences
were within experimental error.
An abridged version of this paper was presented at the 18th Int. Symposium on Shock Waves at Sendai, Japan during July 21
to 26, 1991 and at the 19th Int. Symposium on Shock Waves at Marseille, France during July 26 to 30, 1993. |
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Keywords: | Thermal radiation Diesel spray combustion IR-emission Injection pressure Methanol spray |
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