Coal-water slurry sprays from an electronically controlled accumulator fuel injection system: Break-up distances and times
Abstract
Experiments have been completed to characterize coal-water slurry sprays from an electronically-controlled accumulator fuel injection system of a diesel engine. The sprays were injected into a pressurized chamber equipped with windows. High speed movies, fuel pressures, and needle lifts were obtained as a function of time, orifice diameter, coal loading, gas density in the chamber, and accumulator fuel pressure. For the base conditions (50% by mass coal loading, 0.4 mm diameter nozzle hole, coal-water slurry pressure of 82 MPa (12,000 psi), and a chamber density of 25 kg/m(exp 3)), the break-up time was 0.30 ms. An empirical correlation for spray tip penetration, break-up time, and initial jet velocity was developed. For the conditions of this study, the spray tip penetration and initial jet velocity were 15% greater for coal-water slurry than for diesel fuel or water. Results of this study and the correlation are specific to the tested coal-water slurry and are not general for other coal-water slurry fuels.
- Publication:
-
Presented at the 1993 Joint Central States and Eastern Sections of the Combustion Institute
- Pub Date:
- 1993
- Bibcode:
- 1993jcse.rept...15C
- Keywords:
-
- Coal;
- Diesel Engines;
- Diesel Fuels;
- Fuel Injection;
- Fuel Sprays;
- Slurries;
- Sprayers;
- Cinematography;
- Gas Density;
- Orifices;
- Pressure Dependence;
- Time Dependence;
- Water;
- Mechanical Engineering