Spray tip penetration and cone angles for coal-water slurry using a modified medium-speed diesel engine injection system
- Texas A and M Univ., College Station, TX (United States). Dept. of Mechanical Engineering
Experiments have been completed to characterize coal-water slurry sprays from a modified positive displacement fuel injection system of a medium-speed diesel engine. The injection system includes an injection jerk pump driven by an electric motor, a specially designed diaphragm to separate the abrasive coal from the pump, and a single-hole fuel nozzle. The sprays were injected into a pressurized chamber equipped with windows. High speed movies, instantaneous fuel line pressures and needle lifts were obtained. For injection pressures of order 30 MPa, the sprays were similar for coal-water slurry, diesel fuel and water. The time until the center core of the spray broke-up (break-up time) was determined from both the movies and from a correlations using the fuel line pressures. Results from these two independent procedures were in good agreement. For the base case conditions, the break-up time was 0.58 and 0.50 ms for coal-water slurry and diesel fuel, respectively. The break-up times increased with increasing nozzle orifice size and with decreasing chamber density. The break-up time was not a function of coal loading for coal loadings up to 53%. Cone angles of the sprays were dependent on the operating conditions and fluid, as well as on the time and location of the measurement. For the cases studied, the time-averaged cone angles ranged between 10.2 and 17.0{degree}.
- Research Organization:
- General Electric Co., Erie, PA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC21-88MC23174
- OSTI ID:
- 10136516
- Report Number(s):
- DOE/MC/23174-94/C0321; CONF-9204103-3; ON: DE94008975; BR: AA0510000/AA5525000
- Resource Relation:
- Conference: Combustion Institute central states spring meeting on combustion fundamentals and applications,Columbus, OH (United States),26-28 Apr 1992; Other Information: PBD: [1992]
- Country of Publication:
- United States
- Language:
- English
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