Combustion and Performance Evaluation of a Spark Ignition Engine Operating with Acetone–Butanol–Ethanol and Hydroxy
Abstract
:1. Introduction
2. Materials and Methods
2.1. Experimental Test Bench
2.2. Tested Conditions and Fuel Characteristics
2.3. Fundamentals of the Combustion and Thermodynamic Models
2.3.1. Calculation of Combustion Gases Properties
2.3.2. Blow-by Gas Losses
2.3.3. Rejected Heat
2.3.4. Combustion Chamber Volume
2.3.5. Energy Distribution and Emissions Processing
3. Results and Discussion
3.1. Cylinder Pressure
3.2. Heat Release Rate ()
3.3. Combustion Chamber Temperature
3.4. Engine Performance
3.5. Emission Characteristics
3.5.1. CO Emissions
3.5.2. HC Emissions
3.5.3. NOx Emissions
3.5.4. Smoke Emissions
3.5.5. Fuel Energy Distribution
4. Conclusions
- ABE standalone blends reduced both in-cylinder pressure and heat release rate compared to pure gasoline. Contrarily, hydroxy enrichment intensified the former and the latter while promoting a homogeneous fuel mixture.
- Engine load directly affected the combustion phasing leading to advanced or retarded combustion in the range of 0.2°–1.2°.
- ABE-based blends increase BSFC between 10–25 compared to pure gasoline due to lower calorific value and lower energy density. The partial fuel substitution with hydroxy gas counterbalanced this rise while obtaining a net BSFC reduction compared to the baseline fuel.
- The implementation of dual-fuel operation promoted a significant minimization of CO, HC, and smoke levels. However, CO2 and NOx emissions escalated due to enhanced combustion oxidation and higher combustion temperatures, which opens a new path for incorporating advanced fuel injection systems and after-exhaust treatment technologies.
- Energy losses represented a predominant share (37–52%) from the chemical energy input depending on the load. Increasing ABE and HHO content in the dual-fuel operation maximizes the power output by up to 2.2%. In contrast, high-load conditions promoted the minimization of energy losses, which implies higher combustion efficiency.
- ABE 10 + HHO featured the highest thermal efficiency (28–33%) from the fuel blends. Moreover, hydroxy doping increased efficiency up to 1.8%.
- Exergy destruction represents up to half of the exergy distribution, demonstrating the predominant share of internal irreversibilities in the combustion phenomena. Dual-fuel mode and higher engine loads result in enhanced useful exergy and power output.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
Abbreviations
ABE | Acetone–Butanol–Ethanol |
BSFC | Break specific fuel consumption |
CI | Compression ignition |
HHO | Hydroxy gas |
LHV | Lower heating value |
ICE | Internal combustion engine |
Heat release rate | |
SI | Spark ignition |
BSFC | Brake specific fuel consumption |
CO | Carbon monoxide |
CO2 | Carbon dioxide |
NOx | Nitrogen oxides |
HC | Hydrocarbons |
WHR | Waste heat recovery |
Nomenclature | |
A | Area |
b | Internal diameter of the combustion chamber |
Best estimate of measurement | |
P | Mean combustion chamber pressure |
V | Combustion chamber volume |
m | Gas mass |
Empirical emission gas constants | |
Model constants | |
Deformation constant | |
/ | Specific heat at constant volume/pressure |
T | Combustion chamber gas temperature |
Heat release | |
Heat rejected by convection | |
H | Enthalpy |
h | Specific enthalpy |
Heat transfer coefficient of the wall | |
R | Ideal gas constant |
N | Engine speed |
Number of repetitions | |
Power output | |
Vertical position of the piston | |
Engine stroke | |
Standard deviation | |
Engine torque | |
Internal energy | |
Specific Internal Energy | |
Gas Mass Fraction | |
Heat transfer surface area of the combustion chamber | |
Connecting rod’s critical area | |
Diameter | |
Length | |
Pollutant emissions in power unit | |
Exhaust emissions in ppm/%vol. | |
Compression ratio | |
Elastic modulus of steel | |
Piston acceleration | |
Eccentricity between the stump and the bearing, located in its centerline | |
Gas molecular weight | |
W | Mechanical work |
Average velocity of the combustion chamber | |
Measurement | |
Greek Letters | |
Crankshaft angle | |
Δ | Differential variation |
Fluid density | |
Angle between the connecting rod and piston | |
Rotational angle | |
Specific heat ratio | |
ω | Angular speed |
η | Efficiency |
Subscripts | |
0 | Initial conditions |
comb | Combustion chamber gas |
bb | Blow-by gas |
Crankshaft | |
D | Discharge |
Pressure deformation | |
Displaced | |
Exhaust | |
Stoichiometric combustion | |
Mean | |
Mechanical | |
Top-dead center volume | |
Theoretical | |
Gaseous fuel | |
Valve | |
Intake/inlet | |
Inertial forces |
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Specification | Value |
---|---|
Engine type | 4T OHV |
Max. Power | 3.5 kW |
Bore × Stroke | 66 × 50 mm |
Max. Torque | 10.5 Nm/2400 rpm |
Compression ratio | 8.5:1 |
Fuel capacity | 4.5 L |
Ignition system | T.C.I |
Displacement | 171 cc |
Parameter | Instrument | Manufacturer | Range |
---|---|---|---|
Cylinder pressure | Piezoelectric transducer | KISTLER type 7063-A | 0–250 bar |
Airflow | Air mass sensor | BOSCH OE-22680 7J600 | 0–125 g/s |
Angle | Crankshaft angle | Beck Arnley 180–0420 | 5–9999 RPM |
Fuel measuring | Gravimetric meter | OHAUS-PA313 | 0–310 g |
HHO gas flow | HHO flow rate | GT-556-MTR-ICV | 0–3 LPM |
Temperature | Temperature sensor | Type K | −200–1370 °C |
CO | Exhaust gas analyzer | BrainBee AGS-688 | 0–9.99% |
HC | 0–9999 ppm | ||
NOx | PCA-400 | 0–3000 ppm | |
Smoke opacity | BrainBee OPA-100 | 0–99.9% |
Variable | Uncertainty (%) |
---|---|
Pressure chamber | ±0.4 |
Air mass | ±1.2 |
Crankshaft angle | ±1.1 |
Gravimetric meter | ±1.2 |
HHO flow rate | ±1.0 |
CO2 | ±1.1 |
HC | ±1.5 |
Smoke opacity | ±2.0 |
NOx | ±1.5 |
Total uncertainty | ±3.8 |
Parameter | Units | Gasoline | Acetone | Butanol | Ethanol |
---|---|---|---|---|---|
Chemical formula | - | ||||
LHV | () | 43.4 | 29.6 | 33.1 | 26.8 |
Density | () | 737 | 788 | 810 | 789 |
Vaporization latent heat | () | 440 | 518 | 716 | 904 |
Autoignition temperature | (°C) | 300 | 465 | 343 | 420 |
Laminar flame speed | () | 33 | 34 | 48 | 39 |
Parameter | Units | ABE5 | ABE10 |
---|---|---|---|
LHV | () | 42.79 | 42.20 |
Density | () | 740.38 | 743.76 |
Latent Vaporization heat | () | 451.77 | 463.54 |
Autoignition temperature | (°C) | 304.36 | 308.73 |
Laminar flame velocity | () | 33.49 | 33.99 |
Test | RPM | Load (%) | Fuel Mixture Composition | Symbology |
---|---|---|---|---|
1 | 2400 | 50 | 100% Gasoline | G |
2 | 95% Gasoline + 5% ABE | ABE5 | ||
3 | 90% Gasoline + 10% ABE | ABE10 | ||
4 | 95% Gasoline + 5% ABE + 0.04 LPM Hydroxy | ABE5 + HHO | ||
5 | 90% Gasoline + 10% ABE + 0.04 LPM Hydroxy | ABE10 + HHO | ||
6 | 75 | 100% Gasoline | G | |
7 | 95% Gasoline + 5% ABE | ABE5 | ||
8 | 90% Gasoline + 10% ABE | ABE10 | ||
9 | 95% Gasoline + 5% ABE + 0.04 LPM Hydroxy | ABE5 + HHO | ||
10 | 90% Gasoline + 10% ABE + 0.04 LPM Hydroxy | ABE10 + HHO | ||
11 | 100 | 100% Gasoline | G | |
12 | 95% Gasoline + 5% ABE | ABE5 | ||
13 | 90% Gasoline + 10% ABE | ABE10 | ||
14 | 95% Gasoline + 5% ABE + 0.04 LPM Hydroxy | ABE5 + HHO | ||
15 | 90% Gasoline + 10% ABE + 0.04 LPM Hydroxy | ABE10 + HHO |
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Guillin-Estrada, W.; Maestre-Cambronel, D.; Bula-Silvera, A.; Gonzalez-Quiroga, A.; Duarte-Forero, J. Combustion and Performance Evaluation of a Spark Ignition Engine Operating with Acetone–Butanol–Ethanol and Hydroxy. Appl. Sci. 2021, 11, 5282. https://doi.org/10.3390/app11115282
Guillin-Estrada W, Maestre-Cambronel D, Bula-Silvera A, Gonzalez-Quiroga A, Duarte-Forero J. Combustion and Performance Evaluation of a Spark Ignition Engine Operating with Acetone–Butanol–Ethanol and Hydroxy. Applied Sciences. 2021; 11(11):5282. https://doi.org/10.3390/app11115282
Chicago/Turabian StyleGuillin-Estrada, Wilson, Daniel Maestre-Cambronel, Antonio Bula-Silvera, Arturo Gonzalez-Quiroga, and Jorge Duarte-Forero. 2021. "Combustion and Performance Evaluation of a Spark Ignition Engine Operating with Acetone–Butanol–Ethanol and Hydroxy" Applied Sciences 11, no. 11: 5282. https://doi.org/10.3390/app11115282