Browse > Article

An Experimental Study on the Flow Characteristics and the Stratification Effects in Visualization Engine Using the DPIV and the Entropy Analysis  

Lee Changhee (Department of Mechanical Engineering, Hanyang University)
Lee Kihyung (Department of Mechanical Engineering, Hanyang University)
Lee Changsik (Department of Mechanical Engineering, Hanyang University)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.13, no.1, 2005 , pp. 9-18 More about this Journal
Abstract
The objective of this study is to analyse the spray characteristics according to the injection duration under the ambient pressure condition, and the injection timing in the visualization engine. In order to investigate the spray behavior, we obtained the spray velocity using the PIV method that has been an useful optical diagnostics technology, and calculated the vorticity from spray velocity component. These results elucidated the relationship between vorticity and entropy which play an important role in the diffusion process for the early injection case and the stratification process for the late injection case. In addition, we quantified the homogeneous diffusion rate of spray using the entropy analysis based on the Boltzmann's statistical thermodynamics. Using these method, it was found that the concentration of spray droplets caused by the increase of injection duration is more effective than the increase of momentum dissipation. We also found that the homogeneous diffusion rate increased as the injection timing moved to the early intake stroke process and BTDC $50^{\circ}$ was the most efficient injection timing for the stratified mixture formation during the compression stroke.
Keywords
DISI engine(Direct Injection Spark Ignition engine); DPIV(Digital Particle Image Velocimetry); Stratification effect; Vorticity strength; Frame straddle;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 H. Michael, A. Brad and S. Hochgreb, 'Early Spray Development in Gasoline Direct-Injected Spark Ignition Engine,' SAE 980160, 1998
2 Y. Iwamoto, K. Noma, O. Nakayama, T. Yamauchi and H. Ando, 'Development of Gasoline Direct Injection Engine,' SAE 970541, 1997
3 T. H. Lake, J. Stokes, P. A Whitaker and J. V. Crump, 'Comparison of Direct Injection Gasoline Combustion System,' SAE 980154, 1998
4 S. Yamamoto, T. Satou and M. Ikuta, 'Feasibility Study of Two-stage Hybrid Combustion in Gasoline Direct Injection Engines,' SAE 2002-01-0113, 2002
5 F.-Q. Zhao, J.-H. Yoo, and M.-C. Lai, 'Spray Dynamics of High Pressure Fuel Injectors for DI Gasoline Engines,' SAE 961925, 1996
6 T. Nogi, T. Shiraishi, Y. Nakayama, M. Ohsuga and N. Kurihara, 'Stability Improvement of Direct Fuel Injection Engine under Lean Combustion Operation,' SAE 982703, 1998
7 K. Hiraya, K. Hasegawa, T. Urushihara, A. Iiyama and T. Itoh, 'A Study on Gasoline Fueled Compression Ignition Engine,' SAE 2002-01- 0416, 2002
8 F. Q. Zhao and M. C. Lai, 'A Review of Mixture Preparation and Combustion Control Strategies for Spark-Ignited Direct-Injection Gasoline Engine,' SAE 970627, 1997
9 N. S. Jackson and J. Stokes, 'Research and Development of Advanced Direct Injection Gasoline Engines,' 18th International Vienna Motor Symposium, 1997
10 Y. Iwakiri and A. Kakuho, 'Effectiveness and Issues of Various Measurement Techniques Used in Evaluating Spray Characteristics in a Direct-Injection Gasoline Engine,' Proceeding of The 15th International Combustion Engine Symposium, 9935095, 1999
11 M. Yamakawa, S. Isshiki, T. Yoshizaki and K. Nishida, 'Measurement of Ambient Air Motion of D.I. Gasoline Spray by LIF-PIV,' COMODIA, pp.499-504, 2001
12 C. Preussner, C. Doring, S. Fehler and S. Kampmann, 'GDI : Interaction Between Mixture Preparation, Combustion System and Injector Performance,' SAE 980498, 1998
13 W. Ipp, V. Wangner, H. Kramer, M. Wensing, A. Leipertz, S. Arndt, A. K. Jain, 'Spray Formation of High Pressure Swirl Gasoline Injectors Investigated by Two-Dimensional Mie and LIEF Techniques,' SAE 1999-010498, 1999
14 D. Marriott and D. Reitz, 'Experimental Investigation of Direct Injection-Gasoline for Premixed Compression Ignited Combustion Phasing Control,' SAE 2002-01-0418, 2002
15 J. H. Rhim, S. Y. No, 'Breakup Length of Conical Emulsion Sheet Discharged by Pressure-swirl Atomizer,' Int. J. Automotive Technology, Vol.2, No.3, pp.93-101, 2001
16 M. Shelby, S. Hochgreb, S. Hochgreb, 'Early Spray Development in Gasoline Direct-Injected Spark Ignition Engines,' SAE 980160, 1998
17 G. M. Choi, D. S. Choi and D. J. Kim, 'Spray Structures and Vaporizing Characteristics of a GDI Fuel Spray,' KSME International Journal, Vol.16, No.7, 2002
18 T. Kume, Y. Iwamoto, K. Iida, M. Murakami, K. Akishino and H. Ando, 'Combustion Controlled Technologies for Direct Injection SI Engine,' SAE 960600, 1996
19 Y. Takagi, T. Teruyuki, S. Muranaka, A. Iiyama, Y. Iwakiri, T. Urushihara and K. Naitoh, 'Simultaneous Attainment of Low Fuel Consumption, High Ourput Power and Low Exhaust Emissions in Direct Injection SI Engine,' SAE 980149, 1998
20 M. Sjoberg, Lars-O. Edling, T. Eliassen, L. Magnusson and H. E. Angstrom, 'GDI HCCI: Effects of Injection Timing and Air Swirl on Fuel Stratification, Combustion and Emissions Formation,' SAE 2002-01-0106, 2002