Autoignition in a premixing-prevaporizing fuel duct using three different fuel injection systems at inlet air temperatures to 1250/sup 0/K

Technical Report · Sun May 01 04:00:00 EDT 1983

OSTI ID:6239693

Tacina, R R

Conditions were determined in a continuous-flow, premixing-prevaporizing duct in which autoignition occurred. Test conditions were representative of an advanced, regenerative-cycle, automotive gas turbine. The test conditions were inlet air temperatures from 600 to 1250/sup 0/K (a vitiated preheater was used), pressures from 170 to 600 kPa, air velocities of 10 to 30 m/sec, equivalence ratios from 0.3 to 1.0, mixing lengths from 10 to 60 cm, and residence times of 2 to 100 ms. The fuel was diesel No. 2. The 12-cm-inside-diameter duct was insulated. Three fuel injectors were used: one was a single simplex pressure atomizer, and the other two were multiple-source injectors. The data obtained with the simplex and one of the multiple-source injectors agreed satisfactorily with the literature and correlated with an Arrenhius expression, tau varies as e/sup E/RT//tau, where tau is the autoignition delay time, E and R are constants, T is the absolute temperature, and p is the pressure. The data obtained with the other multiple-source injector, which used multiple cones to improve the fuel-air distribution, did not correlate well with residence time.

• Research Organization: National Aeronautics and Space Administration, Cleveland, OH (USA). Lewis Research Center
• DOE Contract Number: AI01-77CS51040
• OSTI ID: 6239693
• Report Number(s): DOE/NASA/51040-45; NASA-TM-82938; ON: DE83013237
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330103* -- Internal Combustion Engines-- Turbine
ENGINES
FUEL INJECTION SYSTEMS
FUEL SYSTEMS
FUEL-AIR RATIO
GAS TURBINE ENGINES
HEAT ENGINES
IGNITION
INTERNAL COMBUSTION ENGINES
MIXING
PRESSURE DEPENDENCE
REGENERATION
TEMPERATURE DEPENDENCE