Abstract
The diesel fuels containing 10% and 15% ethanol are known as E-diesel. This study investigates E-diesel’s effects on the diesel cycle and combustion phases under different boost pressure applications. As a result of this study, it was monitored that there is an almost linear correlation between the cylinder gas pressure and the boost pressure during both the intake and power cycles. The maximum pressure rising rate, the ignition delay, and the combustion noise level increased by using E-diesel compared to diesel fuel in all boost pressure applications. It was observed that there was a slight increase in the knock tendency of the diesel engine with the use of E-diesel. The premixed combustion was enhanced with E-diesel, but the controlled combustion stage has a similar trend to neat fossil diesel fuel. The mean convective heat transfer coefficient decreased proportionally with the alcohol content in the mixture. An increase in combustion rate was observed with E-diesel, indicating that flame propagation velocity improved. In order to evaluate the combustion behavior of E-diesel fuels in more detail, the laminar flame velocity of pure ethanol/air, pure butanol/air, and diesel/air mixtures have been reviewed relative to the initial temperature.
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Abbreviations
- \(A\) :
-
Area of heat transfer (m2)
- B :
-
Bore (m)
- \({C}_{1},{C}_{2}\) :
-
Heat transfer parameters (Woschni constants)
- \({c}_{v}, {c}_{p}\) :
-
Specific heats at constant volume and pressure (kJ/kgK)
- \({h}_{c}\) :
-
Convection coefficient (W/m2K)
- \({\Delta \overline{h} }_{c}\) :
-
Heat of combustion (J/kmol)
- \({\Delta \overline{h} }_{R}\) :
-
Enthalpy of the reaction (J/kmol)
- \({\overline{h} }_{f}^{o}\) :
-
Enthalpy of formation (J/kmol)
- MW :
-
Molecular weight (kg/kmol)
- N :
-
Number of moles (kmol)
- \(P\) :
-
Pressure (Pa or bar)
- \({P}_{\mathrm{max},\mathrm{CA}}\) :
-
Location of maximum cylinder gas pressure (oCA)
- \({P}_{\mathrm{max}}\) :
-
Maximum cylinder gas pressure (kPa or bar)
- \({p}_{\mathrm{IVC}}\) :
-
Pressure at IVC (Pa)
- \({p}_{\mathrm{M}}\) :
-
Motoring cylinder gas pressure (kPa)
- T :
-
Temperature (K)
- \({T}_{\mathrm{gas}}\) :
-
Mean gas temperature (K)
- \({T}_{\mathrm{IVC}}\) :
-
Gas temperature at intake valve closing (K)
- \({T}_{\mathrm{wall}}\) :
-
Mean cylinder surface temperature (K)
- \(V\) :
-
Volume (m3)
- \({V}_{\mathrm{IVC}}\) :
-
Cylinder volume at IVC (m3)
- \({V}_{\mathrm{d}}\) :
-
Displacement volume (m3)
- W :
-
Work (Nm)
- \(w\) :
-
Gas velocity in cylinder (m/s)
- \({w}_{\mathrm{ITK}}\) :
-
Gas velocity at IVC (m/s)
- \({w}_{\mathrm{CPR}}\) :
-
Gas velocity at the compression period (m/s)
- \({Q}_{\mathrm{net}}\) :
-
Net heat release rate (J/oCA)
- \({Q}_{\mathrm{gross}}\) :
-
Gross heat release rate (J/oCA)
- \({Q}_{\mathrm{losess}}\) :
-
Heat transfer losses (J)
- \({\theta }_{\mathrm{d}}\) :
-
Flame development angle (oCA)
- \({\theta }_{\mathrm{b}}\) :
-
Rapid burn angle (oCA)
- \(\rho\) :
-
Density (kg/m3)
- \(a\) :
-
After
- \(b\) :
-
Before
- \(X\) :
-
Measured variable
- \(\overline{X }\) :
-
Mean value of an X variable
- \(N\) :
-
Consecutive measurements of an X variable
- \({r}_{c}\) :
-
Compression ratio
- \({P}_{\mathrm{rms}}\) :
-
Root mean square value of the filtered pressure
- \({S}_{x}\) :
-
Standard deviation
- \({S}_{\mathrm{e}}\) :
-
Standard error
- \(\gamma\) :
-
Constant specific heat ratio
- \(\theta\) :
-
Crank angle degree
- ϕ :
-
Equivalence ratio
- BDC:
-
Bottom dead center
- CA:
-
Crank angle
- E-diesel:
-
Ethanol-butan-2-ol-fossil diesel mixtures
- EOC:
-
End of combustion
- EVC:
-
Exhaust valve closing
- EVO:
-
Exhaust valve opening
- HRR:
-
Heat release rate
- IVC:
-
Intake valve closing
- IVO:
-
Intake valve opening
- LHV:
-
Lower heating value
- MFB:
-
Mass fraction burned
- MPRR:
-
Maximum pressure rise rate
- Nu:
-
Nusselt number
- PBDF:
-
Petroleum-based diesel fuel
- Re:
-
Reynolds number
- SOC:
-
Start of combustion
- SOI:
-
Start of injection
- TDC:
-
Top dead center
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Özsezen, A.N. Effects of E-diesel on the combustion characteristics of a diesel engine operating at different boost pressures. J Braz. Soc. Mech. Sci. Eng. 45, 520 (2023). https://doi.org/10.1007/s40430-023-04401-9
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DOI: https://doi.org/10.1007/s40430-023-04401-9