Investigation of Lips-Guided-Flow Combustion Chamber and Miller Cycle to Improve the Thermal Efficiency of a Highly Intensified Diesel Engine
Abstract
:1. Introduction
2. Experiment and Simulation
2.1. Combustion Chamber Design
2.2. LIVC Miller Cycle
2.3. Experimental Setup
2.4. Combustion and Finite Element Simulation
3. Results and Discussion
3.1. LGFC Analysis
3.2. Miller Cycle Analysis
3.3. Combination of LGFC and Miller Cycle
4. Conclusions
- The simulated results show that, in the LGFC combustion system, the quality of the fuel/air mixture increased in the central area of the combustion chamber and the temperature gradient of the cross-section from the cylinder center to the cylinder wall decreased. Large-scale flow easily formed in the cavity of the chamber due to the large longitudinal space area, and the fuel distribution in the cylinder was concentrated in the longitudinal direction, along with the movement of the piston. The combustion was more concentrated in the pit, the combustion on the outside area of the piston top surface decreased, the start of combustion was earlier, the combustion process became more concentrated, and the post-combustion decreased slightly;
- The experimental and simulated results show that, compared with the temperatures of the baseline, the LGFC piston could reduce the average temperature of the piston top by about 3% and depress the heat transfer losses of cylinder walls;
- At a certain excess air coefficient, the indicated specific fuel consumption decreased. The compression pressure line decreased significantly in the Miller cycle, while the expansion pressure line decreased less, and there was an increase in effective work in the high-pressure cycle. The PMEP increased by about 0.015 MPa and the pump work became positive under the Miller cycle condition.
- Under the combination of the LGFC and Miller cycle condition, the effect significantly improved the thermal efficiency of the highly intensified diesel engine and the thermal efficiency of the working process was 2.1% higher than that of the baseline.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
- Steinparzer, F.; Nefischer, P.; Hiemesch, D.; Kaufmann, M. The new BMW six-cylinder top engine with innovative turbocharging concept. MTZ 2016, 71, 38–44. [Google Scholar] [CrossRef]
- Heiduk, T.; Weiβ, U.; Frohlich, A.; Helbig, J. The new V8 TDI engine from Audi. MTZ 2016, 77, 20–25. [Google Scholar]
- Eichler, F.; Demmelbauer-Ebner, W.; Strobel, J.; Kühlmeyer, J. The new W12-TSI engine of the Volkswagen group. MTZ 2016, 77, 16–23. [Google Scholar] [CrossRef]
- Lamping, M.; Korfer, T.; Wix, K. HSDI Diesel Engines—FEV’s high power density concepts. ATZ Autotechnol. 2006, 9, 40–45. [Google Scholar] [CrossRef]
- Pesce, F.C.; Vassallo, A.; Beartice, C.; Di Blasio, G. Exceeding 100 kW/L Milestone: The next step towards defining high performance diesel engines. In Proceedings of the 25th Aachen Colloquium Automobile and Engine Technology 2016, Aachen, Germany, 10–12 October 2016; pp. 159–184. [Google Scholar]
- Demark, R.; Groddeck, M.; Ruetz, G. The new diesel engines series 890 by MTU. MTZ Worldw. 2006, 67, 2–5. [Google Scholar] [CrossRef]
- Hao, C.; Zhang, Z.; Wang, Z.; Bai, H.; Li, Y.; Li, Y.; Lu, Z. Investigation of spray angle and combustion chamber geometry to improve combustion performance at full load on a heavy-duty diesel engine using genetic algorithm. Energy Convers. Manag. 2022, 267, 115862. [Google Scholar] [CrossRef]
- Chen, Y.; Li, X.; Li, X.; Zhao, W.; Liu, F. Verifying the all-flow-guided assumption of the lateral swirl combustion system in DI diesel engines. Fuel 2020, 266, 117079. [Google Scholar] [CrossRef]
- Li, X.; Qiao, Z.; Su, L.; Li, X.; Liu, F. The combustion and emission characteristics of a multi-swirl combustion system in a DI diesel engine. Appl. Therm. Eng. 2017, 115, 1203–1212. [Google Scholar] [CrossRef]
- Su, L.; Li, X.; Zhang, Z.; Liu, F. Numerical analysis on the combustion and emission characteristics of forced swirl combustion system for DI diesel engines. Energy Convers Manag. 2014, 86, 20–27. [Google Scholar] [CrossRef]
- Lu, F.; Yu, X.; Zhang, Y.; Han, S.; Fang, Y. Available energy analysis method and experiment investigation on energy-saving potential for vehicle diesel engine. Chin. Intern. Combust. Engine Eng. 2012, 33, 61–66. [Google Scholar]
- Zhao, C.; Yue, Y.; Zhou, L.; Zhang, F. Thermodynamic analysis of diesel engine 6V150. Trans. Beijing Inst. Technol. 2004, 24, 500–503. [Google Scholar]
- Dahlstrom, J.; Andersson, O.; Tuner, M. Experimental Comparison of Heat Losses in Stepped-Lip Bowl and Re-Entrant Combustion Chambers in a Light Duty Diesel Engine; SAE Technical Paper Series 2016-01-0732; Society of Automotive Engineers: Warrendale, PA, USA, 2016. [Google Scholar]
- Ehleskog, M.; Gjirja, S.; Denbratt, I. Effects of Variable Inlet Valve Timing and Swirl Ratio on Combustion and Emissions in a Heavy-Duty Diesel Engine; SAE Technical Paper Series 2012-01-1719; Society of Automotive Engineers: Warrendale, PA, USA, 2012. [Google Scholar]
- Theiβl, H.; Kraxner, T.; Seitz, H.; Kislinger, P. Miller valve timing for future commercial diesel engines. MTZ 2015, 76, 5–11. [Google Scholar]
- Chen, B.; Zhang, L.; Luo, Q.; Zhang, Q. The thermodynamic analysis of an electrically supercharged Miller cycle gasoline engine with early intake valve closing. Sådhanå 2019, 44, 65. [Google Scholar] [CrossRef]
- Ortwin, D.; Schutting, E.; Eichlseder, H. Extended expansion linkage engine: A concept to increase the efficiency. Automot. Engine Technol. 2018, 3, 83–92. [Google Scholar]
- Wei, S.; Zhao, X.; Liu, X.; Qu, X.; He, C.; Leng, X. Research on effects of early intake valve closure (EIVC) miller cycle on combustion and emissions of marine diesel engines at medium and low loads. Energy 2019, 173, 48–58. [Google Scholar] [CrossRef]
- Zhang, Y.; Wang, Z.; Bai, H.; Guo, C.; Liu, J.; Li, Y. The Reduction of Mechanical and Thermal Loads in a High-Speed HD Diesel Engine Using Miller Cycle with Late Intake Valve Closing; SAE Technical Paper Series 2017-01-0637; Society of Automotive Engineers: Warrendale, PA, USA, 2017. [Google Scholar]
- Long, L.; Jianhua, H.; Zhiguo, Y. The optimization on effective thermal efficiency of low-speed diesel engine. SHIP Eng. 2019, 41 (Suppl. 1), 218–225. [Google Scholar]
- Nevin, R.; Sun, Y.; Gonzalez, D.; Reitz, R. PCCI Investigation Using Variable Intake Valve Closing in a Heavy-Duty Diesel Engine; SAE Technical Paper Series 2007-01-0903; Society of Automotive Engineers: Warrendale, PA, USA, 2007. [Google Scholar]
- Millo, F.; Mallamo, F.; Mego, G. The Potential of Dual Stage Turbocharging and Miller Cycle for HD Diesel Engines; SAE Technical Paper Series 2005-01-0221; Society of Automotive Engineers: Warrendale, PA, USA, 2005. [Google Scholar]
- Kovacs, D.; Eilts, P. Potentials of the Miller Cycle on HD Diesel Engines Regarding Performance Increase and Reduction of Emissions; SAE Technical Paper Series 2015-24-2440; Society of Automotive Engineers: Warrendale, PA, USA, 2015. [Google Scholar]
- Wang, Z.; Zhang, Y.; Wang, L.; Liu, J.; Bai, H.; Li, Y. Effect of LIVC Miller cycle on combustion and gas exchange on a highly intensified single-cylinder diesel engine. Acta Armamentarii 2019, 40, 8–18. [Google Scholar]
- Han, Z.; Reitz, R.D. Turbulence modeling of internal combustion engines using RNG κ-ε models. Combust Sci Technol 1995, 106, 267–295. [Google Scholar] [CrossRef]
- Liu, A.B.; Mather, D.; Reitz, R.D. Modeling the Effects of Drop Drag and Breakup on Fuel Sprays; SAE Technical Paper Series 930072; Society of Automotive Engineers: Warrendale, PA, USA, 1993. [Google Scholar]
- Lu, Y.H.; Zhang, X.; Xiang, P.L.; Dong, D. Analysis of thermal temperature fields and thermal stress under steady temperature field of diesel engine piston. Appl. Therm. Eng. 2017, 113, 796–812. [Google Scholar] [CrossRef]
- Deng, X.; Lei, J.; Wen, J.; Wen, Z.; Shen, L. Multi-objective optimization of cooling galleries inside pistons of a diesel engine. Appl. Therm. Eng. 2018, 132, 441–449. [Google Scholar] [CrossRef]
- Park, S.; Reitz, R. Optimization of fuel/air mixture formation for stoichiometric diesel combustion using a 2-spray-angle group-hole nozzle. Fuel 2009, 88, 843–852. [Google Scholar] [CrossRef]
- Mobasheri, R.; Peng, Z. A Computational Investigation into the Effects of Included Spray Angle on Heavy-Duty Diesel Engine Operating Parameters; SAE Technical Paper 2012–01-1714; Society of Automotive Engineers: Warrendale, PA, USA, 2012. [Google Scholar]
- Sener, R.; Yangaz, M.; Gul, M.Z. Effects of injection strategy and combustion chamber modification on a single-cylinder diesel engine. Fuel 2020, 266, 117122. [Google Scholar] [CrossRef]
- Kokjohn, S.; Hanson, R.; Splitter, D.; Reitz, R.D. Fuel reactivity controlled compression ignition (RCCI): A pathway to controlled high-efficiency clean combustion. Int. J. Engine Res. 2011, 12, 209–226. [Google Scholar] [CrossRef]
- Yao, Z.; Qian, Z.; Li, R. Energy efficiency analysis of marine high-powered medium speed diesel engine base on energy balance and exergy. Energy 2019, 176, 991–1006. [Google Scholar] [CrossRef]
Chamber Parameters | Baseline | LGFC |
---|---|---|
Chamber radius (mm) | 44 | 41.5 |
Lips radius (mm) | 36.05 | 36 |
Lips depth (mm) | 4 | 5.5 |
Bowl radius (mm) | 4.5 | 5 |
Bowl distance (mm) | 33 | 32 |
Item | Parameter |
---|---|
Type | Vertical, 1 cylinder, 4 stroke |
Swept Volume/L | 1.1 |
Engine Speed/rpm | 3800 |
Compression Ratio | 13:1 (Geometric) |
Combustion Chamber | ω chamber |
Fuel Injection System | Common Rail |
Rail Pressure/MPa | 180 |
Supercharging System | Simulated supercharging system with air compressor and heat exchanger |
Valve Train | Double Overhead Camshafts |
Valve Lift | See Figure 4 |
Number of Valves | 4 |
Coolant Temperature/°C | 75 |
Fuel | Standard Diesel |
Devices | Types/Specification | Properties |
---|---|---|
Dynamometer | Electric dynamometer | 0~200 kW, 0~4500 r/min, ±1 r/min |
Fuel consumption meter | Weigh-in fuel consumption meter | 0.3~120 L/h, ±0.2% |
Exhaust gas analyzer | MEXA-584L | 0~5 × 10−3 (NOX) |
Mass flow meter | Sensyflow P | 0~1200 m3/h, <1% FS |
Piezo-electric pressure transducer | Kistler 6061C | 0~25 MPa |
Model Category | Sub-Models |
---|---|
Flow | RNS fluid control equation |
RNG k-ε turbulence equation | |
Redlich–Kwong real gas equation | |
Spray | Liquid.dat variable fuel properties |
KH-RT breakup model | |
NTC droplet collision model | |
O’Rourke Turbulent Dispersion model | |
Dynamic drop drag model | |
Frossling evaporation model | |
Wall film model | |
Combustion | SAGE combustion model |
Measuring Point | Temperature/K (Baseline) | Temperature/K (LGFC) | Temperature Difference/K |
---|---|---|---|
1 | 612 | 597 | 15 |
2 | 650 | 627 | 23 |
3 | 537 | 529 | 8 |
4 | 668 | 653 | 15 |
5 | 637 | 615 | 22 |
6 | 649 | 625 | 24 |
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Wang, Z.; Cao, R.; Li, Y.; Hao, C.; Liu, J.; An, Y.; Ma, R. Investigation of Lips-Guided-Flow Combustion Chamber and Miller Cycle to Improve the Thermal Efficiency of a Highly Intensified Diesel Engine. Sustainability 2023, 15, 14968. https://doi.org/10.3390/su152014968
Wang Z, Cao R, Li Y, Hao C, Liu J, An Y, Ma R. Investigation of Lips-Guided-Flow Combustion Chamber and Miller Cycle to Improve the Thermal Efficiency of a Highly Intensified Diesel Engine. Sustainability. 2023; 15(20):14968. https://doi.org/10.3390/su152014968
Chicago/Turabian StyleWang, Ziyu, Rulou Cao, Yanfang Li, Caifeng Hao, Jinlong Liu, Yanzhao An, and Renwei Ma. 2023. "Investigation of Lips-Guided-Flow Combustion Chamber and Miller Cycle to Improve the Thermal Efficiency of a Highly Intensified Diesel Engine" Sustainability 15, no. 20: 14968. https://doi.org/10.3390/su152014968