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

40IMEP (MPa)1.0751.0501.0251.0000.9750.9500.92510 CA20 CA30 CA8 9 10 11 12Compression ratioFIGURE 4-15 IMEP-Compression ratios with the water Injection duration angleThermal efficiency (%)464442403836Normal10 CA20 CA30 CA8 9 10 11 12Compression ratioFIGURE 4-16 Thermal Efficiency-Compression ratios withthe water injection duration angleAccording to Figure 4-15 and Figure 4-16, this results help to predict the bestwater injection duration angle to simulate a spark ignition engine with water injection.It is found from the results that the curves of indicated mean effective pressure(IMEP) and thermal efficiency ( η)are almost the same for all of the molar waterinjection duration angle increases. Each period of water injection duration angleincreasing were approximately at the value 25,000 Pa of IMEP and 1% of thermalefficiency respectively, which only fluctuate slightly around this value for all ofcompression ratio and curves almost the same for each water injection duration angleincreases. A more value of water injection duration angle may be chosen for thismodel and it follows a similar trend to the high performance due to a less mass factionof water injected, which can be seen more explosion than their of high mass faction as10 CA.