Abstract
Combustion in a spark ignition engine operated at high speed and load is investigated numerically with regard to knock behavior. The study focuses on the concurrent impact of spark timing and exhaust gas recirculation (EGR) on the severity of knock. Specifically, the possibility of knock reduction through the lowering of nitrogen oxide (NO) content in the rest-gas is examined. Simulations are carried out using a stochastic reactor model of engine in-cylinder processes along with a quasi-dimensional turbulent flame propagation model and multicomponent gas-phase chemistry as gasoline surrogate. The knock-limited conditions are detected using the detonation diagram. By lowering the NO content in the external EGR the end-gas auto-ignition is suppressed. This prevents a transition to knocking combustion and enables advancing of spark timing that yields better combustion phasing. As a result, fuel economy is improved and the potential benefits of cleaning theĀ EGR are indicated.
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Abbreviations
- ATDC:
-
after top dead center
- CA/CAD:
-
crank angle/crank angle degree
- CA10,50,90:
-
crank angle of 10%, 50% and 90% of the cumulative heat release
- CFD:
-
computational fluid dynamics
- EGR:
-
exhaust gas recirculation
- EVO:
-
exhaust valve opening
- IMEP:
-
indicated mean effective pressure
- ISFC:
-
indicated specific fuel consumption
- IVC:
-
intake valve closure
- OP:
-
operating point
- PS:
-
pressure signal in knock detection using KIS4 from IAV
- RoHR:
-
rate of heat release
- RoHR-u:
-
rate of heat release in the unburned zone
- SI:
-
spark ignition
- ST:
-
spark timing
- CĻ:
-
mixing time constant
- lI :
-
integral length scale of the flow
- n:
-
engine speed
- uā²:
-
velocity fluctuation
- SL :
-
laminar flame speed
- ST :
-
turbulent flame speed
- Īµ:
-
reactivity parameter
- Ļ:
-
scalar mixing time
- Ļi :
-
ignition delay time
- Ļe :
-
excitation time
- Ļt :
-
turbulent mixing time
- Ī¾:
-
resonance parameter
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Pasternak, M., Netzer, C., Mauss, F., Fischer, M., Sens, M., Riess, M. (2018). Simulation of the Effects of Spark Timing and External EGR on Gasoline Combustion Under Knock-Limited Operation at High Speed and Load. In: GĆ¼nther, M., Sens, M. (eds) Knocking in Gasoline Engines. KNOCKING 2017. Springer, Cham. https://doi.org/10.1007/978-3-319-69760-4_8
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