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

58Performances parameters of different water injection duration angle, fromFigure 4-15 through Figure 4-20, which show that water injection duration angleincreased by 10-30 CAs. The indicated mean effective pressure (IMEP) and thermalefficiency ( η ) increased as the molar water injection-fuel ratio increased, the averageindicated mean effective pressure (IMEP) increased approximately 25,000-75,000 Paand the average increasing in thermal efficiency ( η ) is approximately 2-3 % in bothcases and only fluctuate slightly around this value and these curves seem to be almostthe same with each other at the same mass of water injection.For, the temperature of the two zone thermodynamics model of water injectionmode per 1 CA, It is verified by the simulation that the molar water injection-fuelratio were increased 0.5-2.0. According to Figure 4-27 through Figure 4-38, it can beseen that the relative temperature change of burned gases and injected water whichcan be seen from the curves are almost the same for all cases. The relativetemperature change of burned gases can be seen, from the figures that the temperaturedecrease as the molar water injection-fuel ratio increases gradually. The averagetemperature of burned gases decreased approximately 1-3 K per 1 CA. The relativetemperature change of injected water can be seen from figures that as the temperatureincrease. The average temperature water injected increased approximately 300-700 Kper 1 CA.5.2 SuggestionsA mathematical model has been developed to simulate a four stroke cycle of aspark ignition engine using as gasoline fuel with water injection system. It is assumedthat the water is supplied to system from a perfect injection system into the pistoncylinder and completely mixing while the models are based on the thermodynamicanalysis of the cylinder contents during the engine operating cycle. The programwritten from this simulation model can be used to assist the design of a spark ignitionengine for alternative fuels as well as to study many other fuels such as methane,methanol, nitro methane, benzene together with diesel which can be studied using thissimulation model.