analysis of water injection into high-temperature mixture of ...

53When considering relative temperature show in Figure 4-33 and Figure 4-34,these can be seen that the relative temperature change of water injected and gasesburned which can be run from the curves are almost the same as of molar waterinjection-fuel ratio increases gradually, but more different value of the temperaturechange for water injected and less different of the temperature for gases burned cases.The temperature change of gases burned decreases due to it loses the heat into waterinjected in cylinder. However, the temperature change of gases burned decrease alittle when compared with the temperature change of water. It follows a similar trendfrom the section 4.6.1.1.The relative temperature change of water injected, figure can be seen that thetemperature increase and temperature change of gas burned, figure can be seen thatthe temperature decrease. Results are approximately increased value of 200-600 K per1 CA of water injected and decreased valued of 3.1-3.5 K per 1 CA of gas burned,these depend on compression ratio.When ever the relative compression ratio increases, the mass of water injectedwill increases under the equally pressure. However, volume of water zone at highcompression ratio more than at low compression ratio. Thus, the temperature changeof gases burned must be decreased when compression ratio increases.4.6.6.2 Simulation with variation of equivalence ratios. This simulation testwas run at 2,000 rpm, compression ratio 10 while using molar water injection-fuelratio ( XW) such as 0.1 , 0.15 and 0.2 . These applications were used the differentequivalence ratios ( φ ) varied from 0.8, 0.9, 1.0, 1.1 and 1.2, respectively.Temperature (K)1200100080060040020000.1Nw/Nf0.15Nw/Nf0.2Nw/Nf0.8 0.9 1.0 1.1 1.2Equivalence ratioFIGURE 4-35 The temperature change of water injected with Equivalence ratio