Experimental Investigation on Combustion and Performance of Diesel Engine under High Exhaust Back Pressure
Abstract
:1. Introduction
2. Methods
2.1. Experimental Setup
2.2. Experimental Procedure
3. Results and Discussion
3.1. Combustion Characteristics
3.2. Engine Performance
3.3. Comprehensive Comparison
4. Conclusions
- By adjusting the intake pressure and fuel injection timing, the engine power under 10 kPa and 25 kPa EBP conditions is maintained at the optimum value. Engine power, fuel consumption, and HRR all increase with load increase. The change in EBP has little effect on the optimal engine power, and because the power is similar, the HRR does not change significantly with different EBPs. The EBP affects the fuel consumption rate by affecting both the in-cylinder temperature and the fresh air intake volume. Whether it increases or decreases the fuel consumption rate mainly depends on which influence mechanism plays a decisive role.
- Advanced injection timing and increased residual exhaust gas will advance CA5, and the increase in EBP will cause the initial temperature in the cylinder to rise, which also advances CA5. The trend of CA50 is similar to that of CA5, but there are some differences, mainly because CA5, which reflects ignition, is mainly controlled by injection timing and premixed combustion, while CA50 is mainly determined by diffusion combustion. Earlier injection timing and lighter load will lead to insufficient fuel–air mixing in the late combustion period, prolonging the combustion duration.
- The increase in EBP and the decrease in valve overlap angle will lead to the increase in residual exhaust gas and initial temperature, which will promote the mixing of fuel and air during the ignition delay period, accelerate the initial combustion rate, and increase the maximum pressure rise rate and peak pressure. The position of the ignition time relative to 0° CA becomes an important factor for the peak pressure by affecting the combustion speed during the rapid combustion period and the cylinder volume during the rapid heat release stage.
- Case 1 is applicable to diesel engines with increased EBP caused by EGR and after-treatment systems, while Case 3 is applicable to diesel engines with increased EBP caused by underwater exhaust. Case 2 is suitable for diesel engines with an EBP higher than one atmosphere, while the injection pressure and intensification are limited by technology and materials.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Parameters | Value |
---|---|
Bore (mm) | 270 |
Stroke (mm) | 330 |
Connecting rod length (mm) | 660 |
Number of nozzle holes | 10 |
Spray angle (°) | 148 |
Speed (r/min) | 1000 |
Parameters | Load | Case 1 | Case 2 | Case 3 |
---|---|---|---|---|
Nozzle diameter (mm) | 50% | 0.475 | 0.46 | 0.46 |
75% | ||||
100% | ||||
Rail pressure (bar) | 50% | 1600 | 1500 | 1600 |
75% | ||||
100% | ||||
EBP (kPa) | 50% | 10/25 | 10 | 10/25 |
75% | ||||
100% | ||||
Intake pressure (bar) | 50% | 1.7/1.5 | 1.1 | 1.3/1.2 |
75% | 2.7/2.3 | 1.8 | 2.1/1.8 | |
100% | 3.5/3.1 | 2.5 | 3.0/2.5 | |
Injection timing (° CA BTDC) | 50% | 6/7 | 8 | 9/9 |
75% | 4/8 | 7 | 8/8 | |
100% | 3/9 | 7 | 6/9 | |
lambda | 50% | 2.6/2.6 | 2.84 | 2.43/2.32 |
75% | 2.6/2.4 | 2.75 | 2.35/2.2 | |
100% | 2.3/2.3 | 2.6 | 2.32/2.07 |
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Huang, L.; Liu, J.; Liu, R.; Wang, Y.; Liu, L. Experimental Investigation on Combustion and Performance of Diesel Engine under High Exhaust Back Pressure. Machines 2022, 10, 919. https://doi.org/10.3390/machines10100919
Huang L, Liu J, Liu R, Wang Y, Liu L. Experimental Investigation on Combustion and Performance of Diesel Engine under High Exhaust Back Pressure. Machines. 2022; 10(10):919. https://doi.org/10.3390/machines10100919
Chicago/Turabian StyleHuang, Li, Junjie Liu, Rui Liu, Yang Wang, and Long Liu. 2022. "Experimental Investigation on Combustion and Performance of Diesel Engine under High Exhaust Back Pressure" Machines 10, no. 10: 919. https://doi.org/10.3390/machines10100919