Autoignition in a Premixing-Prevaporizing Fuel Duct Using Three Different Fuel Injection Systems at Inlet Air Temperatures to 1250 exp 0 K

摘要

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 exp 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. (ERA citation 08:036235)