Poor cold start performance is one of the main factors restricting the application range of compression ignition engines. Stable flame generation in the cylinder is the prerequisite for the successful start of the engine. In order to explore ways to improve the cold start ability of the compression ignition engine, the ignition characteristics of diesel sprays at different injection pressures were studied in a constant volume combustion chamber. A high-speed photography technique was used to obtain the color images of the initial flames of diesel free sprays. And the yellow flame is introduced as the criterion for a successful flame generation. It was found that under moderate injection pressures, the reactant concentration and energy dissipation rate reached equilibrium. Under this condition, the duration of the blue flame is relatively stable, and it is most conducive to the generation of the yellow flame in the cylinder. The negative temperature coefficient phenomenon is also observed, and the temperature range in which this phenomenon occurs is identical with the change of injection pressure. A cold start strategy for the compression ignition engine is proposed by controlling the compression-end temperature in the cylinder to be higher than the threshold ignition temperature of diesel spray.
RatzbergerRKraxnerTPramhasJHadlKEichlsederHBuerglerL.Evaluation of valve train variability in diesel engines. SAE Int J Engine2015; 8(5): 2379–2393.
2.
HuangMGowdagiriSCesariXMOehlschlaegerMA.Diesel engine CFD simulations: influence of fuel variability on ignition delay. Fuel2016; 181: 170–177.
3.
ZamboniGCapobiancoM.Experimental study on the effects of HP and LP EGR in an automotive turbocharged diesel engine. Appl Energ2012; 94(2): 117–128.
4.
ChenRMilovanovicN.A computational study into the effect of exhaust gas recycling on homogeneous charge compression ignition combustion in internal combustion engines fuelled with methane. Int J Therm Sci2002; 41(9): 805–813.
5.
ZhangJJingWRobertsWLFangT.Soot measurements for diesel and biodiesel spray combustion under high temperature highly diluted ambient conditions. Fuel2014; 135(6): 340–351.
6.
BariSMohammad EsmaeilM.Effect of H2/O2 addition in increasing the thermal efficiency of a diesel engine. Fuel2010; 89(2): 378–383.
7.
LiGZhangCHLiYY.Effects of diesel injection parameters on the rapid combustion and emissions of an HD common-rail diesel engine fueled with diesel-methanol dual-fuel. Appl Therm Eng2016; 108: 1214–1225.
8.
MaXZhangFXuHShuaiSJ.Throttleless and EGR-controlled stoichiometric combustion in a diesel–gasoline dual-fuel compression ignition engine. Fuel2014; 115(1): 765–777.
9.
ArmasOYehliuKBoehmanAL.Effect of alternative fuels on exhaust emissions during diesel engine operation with matched combustion phasing. Fuel2010; 89(2): 438–456.
10.
LiuFSKangNLiYKWuQ.Experimental investigation on the atomization of a spherical droplet induced by Faraday instability. Exp Therm Fluid Sci2019; 100: 311–318.
11.
LiuFSKangNLiYKWuQ.Experimental investigation on the spray characteristics of a droplet under sinusoidal inertial force. Fuel2018; 226: 156–162.
12.
JiaqiangEPhamMDengYNguyenTDuyVNLeDH, et al. Effects of injection timing and injection pressure on performance and exhaust emissions of a common rail diesel engine fueled by various concentrations of fish-oil biodiesel blends. Energy2018; 149: 979–989.
13.
JiaqiangEHanDDengYZuoWQianCWuG, et al. Performance enhancement of a baffle-cut heat exchanger of exhaust gas recirculation. Appl Therm Eng2018; 134: 86–94.
14.
JiaqiangEZhaoXQiuLWeiKZhangZDengY, et al. Experimental investigation on performance and economy characteristics of a diesel engine with variable nozzle turbocharger and its application in urban bus. Energ Convers Manage2019; 193: 149–161.
15.
JiaqiangEPhamMZhaoDDengYLeDHZuoW, et al. Effect of different technologies on combustion and emissions of the diesel engine fueled with biodiesel: a review. Renew Sust Energ Rev2017; 80: 620–647.
16.
ZhangBZuoHHuangZTanJZuoQ.Endpoint forecast of different diesel-biodiesel soot filtration process in diesel particulate filters considering ash deposition. Fuel2020; 272: 117678.
17.
JiaqiangEZhaoMZuoQZhangBZhangZPengQ, et al. Effects analysis on diesel soot continuous regeneration performance of a rotary microwave-assisted regeneration diesel particulate filter. Fuel2020; 260: 116353.
18.
LippertAMStantonDWRutlandCJHallettWLHReitzRD.Multidimensional simulation of diesel engine cold start with advanced physical submodels. Int J Engine Res2000; 1(1): 1–27.
19.
HasegawaMNishizawaTImaokaYKawamotoKTerajiAIioS. Improvement of combustion stability under cold ambient condition by mixture control. SAE Int J Engine2013; 6(2): 1021–1034.
20.
PrestiMPaceLPoggioLRossiV.Cold start thermal management with electrically heated catalyst: a way to lower fuel consumption. SAE technical paper 2013-24-0158, 2013.
21.
ManuelAGonzalezDBormanGLReitzRD.A study of diesel cold starting using both cycle analysis and multidimensional calculations. SAE technical paper 910180, 1991.
22.
ChengKYShaylerPJMurphyM.The influence of blow-by on indicated work output from a diesel engine under cold start conditions. Proc IMechE, Part D: J Automobile Engineering2004; 218(3): 333–340.
23.
PhatakRNakamuraT.Cold startability of open-chamber direct-injection diesel engines-Part I: measurement technique and effects of compression ratio. SAE technical paper 831335, 1983.
24.
YaoMZhengZLiuH.Progress and recent trends in homogeneous charge compression ignition (HCCI) engines. Prog Energ Combust2009; 35(5): 398–437.
25.
BenduHMuruganS.Homogeneous charge compression ignition (HCCI) combustion: mixture preparation and control strategies in diesel engines. Renew Sust Energ Rev2014; 38: 732–746.
26.
LaguittonOCruaCCowellTHeikalMRGoldMR.The effect of compression ratio on exhaust emissions from a PCCI diesel engine. Energ Convers Manage2007; 48(11): 2918–2924.
27.
BroatchARuizSMargotXGilA.Methodology to estimate the threshold in-cylinder temperature for self-ignition of fuel during cold start of Diesel engines. Energy2010; 35(5): 2251–2260.
28.
SuhHK.Investigations of multiple injection strategies for the improvement of combustion and exhaust emissions characteristics in a low compression ratio (CR) engine. Appl Energ2011; 88(12): 5013–5019.
29.
DengYFengCJiaqiangEWeiKZhangBZhangZ, et al. Performance enhancement of the gasoline engine hydrocarbon catchers for reducing hydrocarbon emission during the cold-start period. Energy2019; 183: 869–879.
30.
DengYLiuHZhaoXJiaqiangEChenJ.Effects of cold start control strategy on cold start performance of the diesel engine based on a comprehensive preheat diesel engine model. Appl Energ2018; 210: 279–287.
LindlBSchmitzH-G. Cold start equipment for diesel direct injection engines. SAE technical paper 1999-01-1244, 1999.
33.
PastorJVBermúdezVGarcía-OliverJMRamírez-HernándezJG.Influence of spray-glow plug configuration on cold start combustion for high-speed direct injection diesel engines. Energy2011; 36(9): 5486–5496.
34.
PastorJVGarcía-OliverJMPastorJMRamírez-HernándezJG.Ignition and combustion development for high speed direct injection diesel engines under low temperature cold start conditions. Fuel2011; 90(4): 1556–1566.
35.
ZhangCLiuBHuJYuXWangX.Study on cold starting performance of a low compression ratio diesel engine by using intake flame preheating. Therm Sci2020; 24: 51–62.
36.
DuWLouJJYanYBaoWHLiuFS.Effects of injection pressure on diesel sprays in constant injection mass condition. Appl Therm Eng2017; 121: 234–241.
37.
AgarwalAKDharAGuptaJGKimWILeeCSParkS.Effect of fuel injection pressure and injection timing on spray characteristics and particulate size–number distribution in a biodiesel fuelled common rail direct injection diesel engine. Appl Energ2014; 130: 212–221.
38.
ZhangZLiuFSWangPDuWMaYP.Ignition-characteristic research of the diesel fuel in combustion vessel simulated diesel engine cold start condition. J Energ Eng: ASCE2018; 144(1): 04017069.1–12.
39.
DuWZhangQKZhangZLouJJBaoWH.Effects of injection pressure on ignition and combustion characteristics of impinging diesel spray. Appl Energ2018; 226: 1163–1168.
40.
YaoCDHuJTGengPLShiJJZhangDFJuYS.Effects of injection pressure on ignition and combustion characteristics of diesel in a premixed methanol/air mixture atmosphere in a constant volume combustion chamber. Fuel2017; 206: 593–602.
41.
WangZWShiSGHuangSTangJDuTChengXB, et al. Effects of water content on evaporation and combustion characteristics of water emulsified diesel spray. Appl Energ2018; 226: 397–407.
42.
HwangJBaeCParkJChoeWChaJWooS.Microwave-assisted plasma ignition in a constant volume combustion chamber. Combust Flame2016; 167: 86–96.
43.
MaYHuangSHuangRZhangYXuS.Ignition and combustion characteristics of n-pentanol–diesel blends in a constant volume chamber. Appl Energ2017; 185: 519–530.
44.
PickettLMKookSWilliamsTC. Visualization of diesel spray penetration, cool-flame, ignition, high-temperature combustion, and soot formation using high-speed imaging. SAE technical paper 2009-01-0658, 2009.
45.
JuYGReuterCBWonSH.Numerical simulations of premixed cool flames of dimethyl ether/oxygen mixtures. Combust Flame2015; 162(10): 3580–3588.
46.
ShiZCLeeCFWuHWuYZhangLLiuFS.Optical diagnostics of low-temperature ignition and combustion characteristics of diesel/kerosene blends under cold-start conditions. Appl Energ2019; 251: 113307.
47.
WeinbergNGreenbergJB.On blow-out and lift-off of laminar jet spray diffusion flames. Combust Sci Technol2016; 188(11–12): 1760–1776.
48.
FuXAggarwalSK.Two-stage ignition and NTC phenomenon in diesel engines. Fuel2015; 144: 188–196.
49.
MentzerMAGhoshCLGuoBBrewerKJNicolaiRHerrDA, et al. Feasibility analysis and demonstration of high-speed digital imaging using micro-arrays of vertical cavity surface-emitting lasers. Opt Eng2011; 50(4): 043201.
50.
BielaczycPMerkiszJPielechaJ.A method of reducing the exhaust emissions from DI diesel engines by the introduction of a fuel cut off system during cold start. SAE technical paper 2001-01-3283, 2001.
51.
AkopMZZamaYFuruhataTAraiM.Characteristics of adhesion of diesel fuel on impingement disk wall. Part 1: effect of impingement area and inclination angle of disk. Atomization Spray2013; 23(8): 725–744.
52.
HwangJQiDJungYBaeC.Effect of injection parameters on the combustion and emission characteristics in a common-rail direct injection diesel engine fueled with waste cooking oil biodiesel. Renew Energ2014; 63: 9–17.
53.
AgarwalAKDharAGuptaJGKimWIChoiKLeeCS, et al. Effect of fuel injection pressure and injection timing of Karanja biodiesel blends on fuel spray, engine performance, emissions and combustion characteristics. Energ Convers Manage2015; 91: 302–314.
54.
LiuJHYaoARYaoCD.Effects of diesel injection pressure on the performance and emissions of a HD common-rail diesel engine fueled with diesel/methanol dual fuel. Fuel2015; 140: 192–200.
55.
LiYZhangPKangN.Theoretical analysis of Rayleigh–Taylor instability on a spherical droplet in a gas stream. Appl Math Model2019; 67: 634–644.
56.
LiYZhangPKangN.Linear analysis on the interfacial instability of a spherical liquid droplet subject to a radial vibration. Phys Fluids2018; 30(10): 102104.
57.
LiuFZhangZWuHLiYMaYLiX, et al. An investigation on a diesel jet’s ignition characteristics under cold-start conditions. Appl Therm Eng2017; 121: 511–519.
58.
WierzbaIWangQ.The flammability limits of H2–CO–CH4 mixtures in air at elevated temperatures. Int J Hydrogen Energ2006; 31(4): 485–489.
59.
LiZMGongMQSunEWuJFZhouY.Effect of low temperature on the flammability limits of methane/nitrogen mixtures. Energy2011; 36(9): 5521–5524.
60.
ZhengZLYaoMF.Numerical study on the chemical reaction kinetics of n-heptane for HCCI combustion process. Fuel2006; 85(17–18): 2605–2615.
61.
LeeCFWuYWuHShiZCZhangLLiuFS.The experimental investigation on the impact of toluene addition on low-temperature ignition characteristics of diesel spray. Fuel2019; 254: 115580.
62.
YamamotoAOshibeHNakamuraHTezukaTHasegawaSMarutaK.Stabilized three-stage oxidation of gaseous n-heptane/air mixture in a micro flow reactor with a controlled temperature profile. P Combust Inst2011; 33(2): 3259–3266.
63.
YamadaHSuzakiKTezakiAGotoY.Transition from cool flame to thermal flame in compression ignition process. Combust Flame2008; 154(1–2): 248–258.
64.
SheinsonRSWilliamsFW.Chemiluminescence spectra from cool and blue flames: electronically excited formaldehyde. Combust Flame1973; 21(2): 221–230.
65.
LiuFSYangZMLiYKWuH.Experimental study on the combustion characteristics of impinging diesel spray at low temperature environment. Appl Therm Eng2019; 148: 1233–1245.
