Mechanism of Combustion Noise Influenced by Pilot Injection in PPCI Diesel Engines
Abstract
:1. Introduction
2. Experimental Setup
3. Results and Discussion
3.1. Analysis of In-Cylinder Pressure and Heat Release Rate
3.2. Combustion Noise Analysis by Cylinder Pressure Levels
3.3. SWT of In-Cylinder Pressure Signals
3.4. SWPT of In-Cylinder Pressure Signals
4. Conclusions
- (1)
- Generally, main injection is the significant factor that affects combustion noise in low and mid frequency segments, and an increase of the pilot mass results in mitigation of combustion noise. Pilot injection plays an essential role in high frequency combustion noise, and larger pilot injection quantities lead to higher combustion noise in the high-frequency domain.
- (2)
- Advancing pilot injection timing will attenuate pilot combustion noise energy in mid and high frequency domains, but will strengthen that in the low-frequency range. Additionally, an earlier pilot injection timing also leads to higher main combustion noise energy in almost the whole frequency spectrum.
- (3)
- From the results of SWPT, pilot and main injection combustion impacts on high-frequency combustion noise are concentrated in the frequency band of 1125–2250 Hz and 3375–4500 Hz, and 1125–2250 Hz, respectively.
- (4)
- According to the view of overall combustion noise energy, a large pilot mass with advanced pilot injection timing and small pilot quantity with retarded pilot injection timing is considered as the optimal pilot injection strategy for the mitigation of combustion noise.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Type | Single-Cylinder, Direct-Injection, Water-Cooled Diesel Engine |
---|---|
Bore × Stroke | 85 mm × 96.9 mm |
Displacement | 550 cc |
Compression ratio | 16.3 |
Combustion chamber | Reentrant type (Cavity diameter: 51.6 mm) |
Injection system | Common-rail system with a solenoid injector (Max. pressure: 180 MPa) 0.125 mm × 7 hole nozzle (Spray angle: 156°) |
Supercharging | External supercharging |
EGR system | Low-pressure loop EGR |
Injection pressure | 125 MPa |
Total injection quantity | 32 mm3/stroke |
Pilot injection quantity (qpilot) | 2, 4, 6, 8 mm3/stroke |
Pilot injection timing (θpilot) | −9, −14, −19, −24° ATDC |
Main injection timing (θmain) | 1° ATDC |
EGR rate | 20% |
Swirl ratio | 2.0 |
Sub-Signals | Frequency Band (Hz) |
---|---|
A5 | 0–281.25 |
D5 | 281.25–562.5 |
D4 | 562.5–1125 |
D3 | 1125–2250 |
D2 | 2250–4500 |
D1 | 4500–9000 |
Sub-Signals | Frequency Band (Hz) |
---|---|
T3,0 | 0–1125 |
T3,1 | 1125–2250 |
T3,2 | 2250–3375 |
T3,3 | 3375–4500 |
T3,4 | 4500–5625 |
T3,5 | 5625–6750 |
T3,6 | 6750–7875 |
T3,7 | 7875–9000 |
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Du, J.; Chen, X.; Liu, L.; Liu, D.; Ma, X. Mechanism of Combustion Noise Influenced by Pilot Injection in PPCI Diesel Engines. Appl. Sci. 2019, 9, 1875. https://doi.org/10.3390/app9091875
Du J, Chen X, Liu L, Liu D, Ma X. Mechanism of Combustion Noise Influenced by Pilot Injection in PPCI Diesel Engines. Applied Sciences. 2019; 9(9):1875. https://doi.org/10.3390/app9091875
Chicago/Turabian StyleDu, Jingtao, Ximing Chen, Long Liu, Dai Liu, and Xiuzhen Ma. 2019. "Mechanism of Combustion Noise Influenced by Pilot Injection in PPCI Diesel Engines" Applied Sciences 9, no. 9: 1875. https://doi.org/10.3390/app9091875
APA StyleDu, J., Chen, X., Liu, L., Liu, D., & Ma, X. (2019). Mechanism of Combustion Noise Influenced by Pilot Injection in PPCI Diesel Engines. Applied Sciences, 9(9), 1875. https://doi.org/10.3390/app9091875