The geometry of diesel engine combustion chamber directly affects the fuel atomization and combustion process. In order to meet the increasingly stringent emission regulations, this study took a certain model of diesel engine as the object, and used AVL FIRE 2020 R1 software to optimize the geometry of the prototype ω-type combustion chamber under the premise of unchanged compression ratio (CR). A TCD (T: turbocharged, C: charger air cooling, D: diesel particulate filter) combustion chamber with center boss structure and protrusion structure was designed, and the structural parameters of the TCD combustion chamber were further optimized. The computational fluid dynamics (CFD) method was used to analyze the effects of different combustion chamber geometries on the performance and emission characteristics of diesel engines. The results show that the combustion performance of the TCD combustion chamber is mainly affected by the combustion chamber diameter. Too large or too small a combustion chamber diameter will reduce the indicated power. The indicated power of the optimized TCD combustion chamber is 0.98% higher than that before optimization, and 8.26% higher than that of the ω-type combustion chamber. In addition, the soot emissions of the optimized TCD combustion chamber are reduced by 67.33% compared with the design before optimization, and 88.46% compared with the ω-type combustion chamber.
BaoGHeCWangD, et al. Effects of carrier structure parameters on diesel particulate filter capture performance based on grey relational analysis. Particulate Sci Technol2025; 43(1): 104–119.
2.
ZhouQShaoKWangC, et al. Experimental investigation on the characteristics of ammonia storage for heavy-duty diesel engine SCR catalyst. Fuel2024; 357: 130014.
3.
BaoGHeCZiT, et al. Analysis of gas flow and PM movement characteristics inside diesel particulate filter channel. Process Saf Environ Prot2024; 186: 1134–1148.
4.
ChangJLiXLiuY, et al. Combustion performance and energy distributions in a new multi-swirl combustion system. Energy2022; 256: 124576.
5.
TemizerICihanO. An experimental investigation of new chamber geometry on the combustion characteristics, performance and emissions in a light-duty diesel engine. Fuel2023; 345: 128160.
6.
AliKAmnaRAliMIH. Numerical study to improve the combustion and thermal efficiencies of off-gas/synthesis gas-fueled HCCI-engine at different loads: piston-shape and crevice design. Case Stud Therm Eng2023; 45: 102956.
7.
ThomsonMJ. Modeling soot formation in flames and reactors: recent progress and current challenges. Proc Combust Inst2023; 39(1): 805–823.
8.
YanBWangHZhengZ, et al. The effect of combustion chamber geometry on in-cylinder flow and combustion process in a stoichiometric operation natural gas engine with EGR. Appl Therm Eng2018; 129: 199–211.
9.
LiXQiaoZSuL, et al. The combustion and emission characteristics of a multi-swirl combustion system in a DI diesel engine. Appl Therm Eng2017; 115: 1203–1212.
10.
SinghPTiwariSKSinghR, et al. Modification in combustion chamber geometry of CI engines for suitability of biodiesel: a review. Renew Sustain Energy Rev2017; 79: 1016–1033.
11.
LiXSunZDuW, et al. Research and development of double swirl combustion system for a DI diesel engine. Combust Sci Technol2010; 182(8): 1029–1049.
12.
TaghavifarHKhalilaryaSJafarmadarS. Engine structure modifications effect on the flow behavior, combustion, and performance characteristics of DI diesel engine. Energy Convers Manag2014; 85: 20–32.
13.
GafoorCPAGuptaR. Numerical investigation of piston bowl geometry and swirl ratio on emission from diesel engines. Energy Convers Manag2015; 101: 541–551.
14.
DimitriouPWangWPengZ. A piston geometry and nozzle spray angle investigation in a DI diesel engine by quantifying the air-fuel mixture. Int J Spray Combust Dyn2015; 7(1): 1–24.
15.
LeeJLeeSKimJ, et al. Bowl shape design optimization for engine-out PM reduction in heavy duty diesel engine. SAE technical paper 2015-01-0789, 2015.
16.
QuaziMASinghSKJadhaoM. Effect of piston bowl shape, swirl ratio and spray angle on combustion and emission in off road diesel engine. SAE technical paper 2015-26-0142, 2015.
17.
LiJYangWMZhouDZ. Modeling study on the effect of piston bowl geometries in a gasoline/biodiesel fueled RCCI engine at high speed. Energy Convers Manag2016; 112: 359–368.
18.
KarthickeyanV. Effect of combustion chamber bowl geometry modification on engine performance, combustion and emission characteristics of biodiesel fuelled diesel engine with its energy and exergy analysis. Energy2019; 176: 830–852.
19.
SuLWLiXRZhangZ, et al. Numerical analysis on the combustion and emission characteristics of forced swirl combustion system for DI diesel engines. Energy Convers Manag2014; 86: 20–27.
20.
ZhouHLiXZhaoW, et al. Effects of separated swirl combustion chamber geometries on the combustion and emission characteristics of DI diesel engines. Fuel2019; 253: 488–500.
21.
BuschSPeriniFReitzR, et al. Effects of stepped-lip combustion system design and operating parameters on turbulent flow evolution in a diesel engine. SAE Int J Engines2020; 13(2): 223–240.
22.
FuYFengLLongW, et al. Investigation of the performance of double-layer diverging combustion chamber in a single-cylinder diesel engine. Fuel2020; 268: 117165.
23.
TemizerİCihanÖ. Analysis of different combustion chamber geometries using hydrogen/diesel fuel in a diesel engine. Energy Sour Part A Recovery Util Environ Effects2021; 43(1): 17–34.
24.
MilloFPianoARoggioS, et al. Numerical investigation on mixture formation and combustion process of innovative piston bowl geometries in a swirl-supported light-duty diesel engine. SAE Int J Engines2021; 14(2): 247–262.
25.
KangYLiXShenH, et al. Effects of combustion chamber diameter on the performance and fuel–air mixing of a double swirl combustion system in a diesel engine. Fuel2022; 324: 124392.
26.
ShinJChoiJSeoJ, et al. Pre-chamber combustion system for heavy-duty engines for operating dual fuel and diesel modes. Energy Convers Manag2022; 255: 115365.
27.
HaoYWangGWangQ, et al. Numerical simulation on structural optimization design of combustion chamber of high strength diesel engine. Energy Sour Part A Recovery Util Environ Effects2022; 44(4): 9682–9702.
28.
WangRZhouFLiuJ, et al. Experimental investigation of the influence of pre-chamber structural parameters on combustion and emission characteristics of a high compression ratio SI engine. Therm Sci Eng Prog2024; 47: 102318.
29.
LiJWangYXingK, et al. The influence mechanism of pre-combustion chamber orifice structure on natural gas engines: combustion, emissions, and thermofluid analysis. Appl Therm Eng2024; 236: 121654.
30.
FarajollahiAHFiruziRRostamiM, et al. Consideration of the effects of increasing spray cone angle and turbulence intensity on heavy-duty diesel engine pollution and specific outputs using CFD. Int J Engine Res2023; 24(2): 373–392.
31.
BerniFSparacinoSRiccardiM, et al. A zonal secondary break-up model for 3D-CFD simulations of GDI sprays. Fuel2022; 309: 122064.
32.
JurićFStipićMSamecN, et al. Numerical investigation of multiphase reactive processes using flamelet generated manifold approach and extended coherent flame combustion model. Energy Convers Manag2021; 240: 114261.
33.
OmidvarbornaHKumarAKimDS. Recent studies on soot modeling for diesel combustion. Renew Sustain Energy Rev2015; 48: 635–647.
34.
LeeYLeeSMinK. Prediction of NOx considering NO and NO2 for a CI engine. Proc IMechE, Part D: J Automobile Engineering2022; 236(5): 1058–1068.
35.
LiXChenYSuL, et al. Effects of lateral swirl combustion chamber geometries on the combustion and emission characteristics of DI diesel engines and a matching method for the combustion chamber geometry. Fuel2018; 224: 644–660.
