Mixture properties of the transient fuel spray injected by group-hole nozzles were quantitatively studied in a constant volume chamber via the laser absorption scattering (LAS) technique, and compared with conventional single-hole nozzles. Specific areas investigated included non-evaporating and evaporating ambient conditions, and the conditions of free spray and spray impinging on a flat wall. The particular emphasis was on the effect of one of the key parameters of the group-hole nozzle structure, namely, the interval between orifices. Subsequently, in-cylinder ignition and combustion processes were investigated by direct flame visualization in a single-cylinder optical research engine using the group-hole nozzle and the standard multi-hole nozzle, together with heat release analysis. Results show that the group-hole nozzle can produce a smaller Sauter mean diameter (SMD) of droplets under the non-evaporating condition. Under the evaporating condition, for the free spray cases, there exists a trade-off between the fuel evaporation and the spray penetration in the application of the group-hole nozzle. With the increase in interval between orifices, the ratio of evaporation increases, but the spray tip penetration decreases. For the spray impinging on a flat wall, the group-hole nozzle can enhance the spray tip penetrations to some extent compared with the single-hole nozzles. Flame images taken in a direct injection optical engine show that the enhancement of the fuel atomization and evaporation by the group-hole nozzle may contribute to a decrease in overall flame luminosity level, suggesting reduced soot formation in diesel engines.
GaleN., ‘Global diesel emissions technology for the next 15 years.’ In Proceedings of the Chinese Society for Internal Combustion Engine Symposium, Shanghai, China
2.
MoserF. X.SamsT.CartellieriW., ‘Impact of future exhaust gas emission legislation on the heavy duty truck engine.’SAE paper 2001-01-0186
3.
MuellerC. J.MartinG. C.BriggsT. E.DuffyK. P., ‘An experimental investigation of in-cylinder processes under dual-injection conditions in a DI diesel engine.’SAE paper 2004-01-1843
4.
SimescuS.FivelandS., ‘An experimental investigation of PCCI-DI combustion and emissions in a heavy-duty diesel engine.’SAE paper 2003-01-0345
5.
MahrB., ‘Future and potential of diesel injection systems.’ In Proceedings of Conference on Thermo- and fluid-dynamic processes in diesel engines (THIESEL), Valencia, Spain
6.
LancefieldT., ‘The influence of variable valve actuation on the part-load fuel economy of a modern light-duty diesel engine.’SAE paper 2003-01-0028
7.
StanglmaierR. H.RobertsC. E., ‘Homogeneous charge compression ignition (HCCI): Benefits, compromises, and future engine applications.’SAE paper 1999-01-3682
8.
ZhaoF. Q., Homogeneous charge compression ignition (HCCI) engines. Key research and development issues (PT-94) (: SAE International2003)
9.
WakuriY.FujiiM.AmitaniT.TsuneyaR., ‘Studies on the penetration of fuel spray of diesel engine.’Bull. JSME3 (9) (1960): 123–130 (in Japanese)
10.
NaberJ. D.SiebersD. L., ‘Effects of gas density and vaporization on penetration and dispersion of diesel sprays.’SAE paper 960034
11.
BergstrandP.ForsthM.DenbranttI., ‘The influence of orifice diameter on flame lift-off length.’ In Proceedings of ILASS-Europe, Zaragoza, Spain
12.
SiebersD.HigginsB., ‘Flame lift-off on direct-injection diesel sprays under quiescent conditions.’SAE paper 2001-01-0530
13.
SuT. F.ChangC. T.ReitzR. D.FarrellP. V., ‘Effects of injection pressure and nozzle geometry on spray SMD and DI diesel emissions.’SAE paper 952360
14.
MontgomeryD. T.ChanM.ChangC. T.FarrellP. V.ReitzR. D., ‘Effect of injector nozzle hole size and number on spray characteristics and the performance of a heavy-duty DI diesel engine.’SAE paper 962002
15.
KoboriS.KamimotoT.KosakaH., ‘Ignition, combustion and emissions in a DI diesel engine equipped with a micro-hole nozzle.’SAE paper 960321
16.
BergstrandP.DenbranttI., ‘Diesel combustion with reduced nozzle orifice diameter.’SAE paper 2001-01-2010
17.
HottaY.NakakitaK.FuyutoT.InayoshiM.FujiwaraK.SakataI., ‘Cause of exhaust smoke and its reduction methods in an HSDI diesel engine under high-speed and high-load conditions.’SAE paper 2002-01-1160
18.
BergstrandP.DenbranttI., ‘The effects of multirow nozzles on diesel combustion.’SAE paper 2003-01-0701
19.
HountalasD. T.ZannisT. C.MavropoulosG. C.SchwarzV.BenajesJ.GonzalezC., ‘Use of a multi-zone combustion model to interpret the effect of injection nozzle hole geometry on HD DI diesel engine performance and pollutant emissions.’SAE paper 2005-01-0367
20.
HiroyasuH.AraiM., ‘Structures of fuel sprays in diesel engines.’SAE paper 900475
21.
SuT. F.FarrellP. V., ‘Characterization of high-injection-pressure diesel sprays with relation to particulate and NOx emissions.’Atomization and Sprays8 (1) (1998): 83–107
22.
NikolicD.WakimotoK.TakahashiS.IidaN., ‘Effect of nozzle diameter and EGR ratio on the flame temperature and soot formation for various fuels.’SAE paper 2001-01-1939
23.
TokudaH.ItohS.KinugawaM., ‘DENSO common rail technology to successfully meet future emission regulation.’ In Proceedings of the 26th Internationales Wiener Motorensymposium 2005, Vienna, Austria
24.
NishijimaY.MashidaM.SasakiS.OshimaK., ‘Successful approach to reduce emission by group holes nozzle.’ In Proceedings of the 2005 JSAE Annual Congress, JSAE paper 20055073
25.
YoshitomiK.UchidaN., ‘Effect of group holes nozzle specifications on diesel exhaust emissions.’ In Proceedings of the 2005 JSAE Annual Congress, JSAE paper 20055729
26.
YataY.KidenaR.KitamuraY.KeeS. S.IshiyamaT.ShiojiM.WatanabeY., ‘Study on ignition and combustion of fuel sprays using group-holes nozzles.’ In Proceedings of the 2006 JSAE Annual Congress, JSAE paper 20065792
27.
ZhangY. Y.NishidaK.NomuraS.ItoT., ‘Spray characteristics of a group-hole nozzle for direct-injection diesel engines.’Atomization and Sprays16 (1) (2006): 35–49
28.
NishidaK.NomuraS.MatsumotoY., ‘Spray and mixture properties of group-hole nozzle for DI diesel engines.’ In Proceedings of ICLASS-2006
29.
GaoJ.MatsumotoY.NishidaK., ‘Effects of group-hole nozzle specifications on fuel atomization and evaporation of direct injection diesel sprays.’SAE paper 2007-01-1889
30.
SuzukiS.NishidaK.HiroyasuH., ‘Simultaneous concentration measurement of vapor and liquid in an evaporating diesel spray.’SAE paper 930863
31.
ZhangY. Y.NishidaK.YoshizakiT., ‘Quantitative measurement of droplets and vapor concentration distributions in diesel sprays by processing UV and visible images.’SAE paper 2001-01-1294
32.
ZhangY. Y.NishidaK., ‘Imaging of vapor/liquid distributions of split-injected diesel sprays in a two-dimensional model combustion chamber.’Combust. Sci. Technol.176 (9) (2004): 1465–1491
33.
KamimotoT.YokataH.KobayashiH., ‘A new technique for the measurement of Sauter. mean diameter of droplets in unsteady dense sprays.’SAE paper 890316
34.
ZhangY. Y.YoshizakiT.NishidaK., ‘Imaging of droplets and vapor distributions in a diesel fuel spray by means of a laser absorption-scattering technique.’Appl. Optics39 (33) (2000): 6221–6229
35.
KimB. S.YoonW. H.RyuS. H.HaJ. S., ‘Effect of the injector nozzle hole diameter and number on the spray characteristics and the combustion performance in medium-speed diesel marine engines.’SAE paper 2005-01-3853
36.
GaoJ.MatsumotoY.NishidaK., ‘Effect of injection pressure and nozzle hole diameter on mixture properties of DI diesel spray.’JSAE Trans.38 (5) (2007): 89–94
TowT.PierpontA.ReitzR. D., ‘Reducing particulate and NOx emissions by using multiple injections in a heavy duty DI diesel engine.’SAE paper 940897
39.
HanZ.UludoganA.HampsonG.ReitzR. D., ‘Mechanism of soot and NOx emission reduction using multiple-injection in a diesel engine.’SAE paper 960633
40.
KuniyoshiH.TanabeH.SatoG. T.FujimotoH., ‘Investigation on the characteristics of diesel fuel spray.’SAE paper 800968
41.
KatsuraN.SaitoM.SendaJ.FujimotoH., ‘Characteristics of a diesel spray impinging on a flat wall.’SAE paper 890264
42.
SendaJ.FukamiY.TanabeY.FujimotoH., ‘Visualization of evaporative diesel spray impinging upon wall surface by Exciplex fluorescence method.’SAE paper 920578
