This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Droplet Size and Velocity Measurements for the Characterization of a DI-Diesel Spray Impinging on a Flat Wall
Annotation ability available
Sector:
Language:
English
Abstract
In small high speed direct injection diesel engines the injected fuel spray impinges on the walls of the piston bowl. The mixture formation process is influenced considerably by the spray-wall interaction. Stringent exhaust gas emission regulations and growing demands for fuel economy are leading to the application of high-pressure fuel injection systems, e.g. common-rail. The trend towards downsized engines with smaller piston displacements leads to reduced distances between nozzle and wall. Higher injection pressures and smaller nozzle-wall distances both increase the significance of spray-wall interaction and near-wall mixture formation.
In the present study the influence of governing parameters like injection pressure and wall temperature on the characteristics of the impinged spray was investigated. The measurements have been performed in an optical accessible high-pressure high-temperature combustion chamber, in which air pressures and air temperatures up to 5 MPa and 500 °C can be realised under steady state conditions. A flat wall with adjustable wall temperature was placed at a distance of 20 mm from the nozzle hole. A passenger car common-rail injector with a mini-sac-hole-nozzle was applied to the combustion chamber. The spray axis of the investigated nozzle hole was oriented perpendicular to the wall. Commercially available diesel fuel was used.
Locally resolved simultaneous measurements of droplet velocity (axial and radial velocity component) and droplet diameter at several positions 2 mm above the wall inside the impinged and deflected spray were performed with phase Doppler velocimetry (PDV). By the experiments effects of the variations on the temporal and spatial development of the near-wall spray, e.g., wall jet, wall jet vortex and droplet size distribution were determined.
Recommended Content
Authors
Topic
Citation
Schünemann, E., Fedrow, S., and Leipertz, A., "Droplet Size and Velocity Measurements for the Characterization of a DI-Diesel Spray Impinging on a Flat Wall," SAE Technical Paper 982545, 1998, https://doi.org/10.4271/982545.Also In
References
- Katsura, N. Saito, M. Senda, J. Fujimoto, H. “Characteristics of a Diesel Spray Impinging on a Flat Wall” SAE Paper 890264 1989
- Arcoumanis, C. Whitelaw, J.H. Hentschel, W. Schindler, K.-P. “Flow and Combustion in a Transparent 1.9 l Direct-Injection Diesel Engine” Autotech Conference Birmingham Nov. 16-19 1993
- Rao, K.K. Winterbone, D.E. Clough, E. “Laser Illuminated Photographic Studies of the Spray and Combustion Phenomena in a Small High Speed DI Diesel Engine” SAE Paper 922203 1992
- Naber, J.D. Reitz, R.D. “Modeling engine spray / wall impingement” SAE Paper 880107 1988
- Naber, J.D. Farrell, P. “Hydrodynamics of Droplet Impingement on a Heated Surface” SAE Paper 930919 1993
- Senda, J. Kobayashi, M. Iwashita, S. Fujimoto, H. “Modeling of Diesel Spray Impingement on a Flat Wall” SAE Paper 941894 1994
- Matsui, Y. Sugihara, K. “Sources of Hydrocarbon Emissions from a Small Direct Injection Diesel Engine” SAE Paper 872613 1987
- Roosen, P. “Einspritzstrahlstruktur vor Dieseldüsen” Motortechnische Zeitschrift 52 526 531 1991
- Fath, A. Fettes, C. Leipertz, A. “Investigation of the Diesel Spray Break-Up Close to the Nozzle at Different Injection Conditions” Proc. COMODIA '98 Kyoto July 20-23 1998
- Münch, K.-U. Leipertz, A. “Investigation of Spray Penetration and Fuel Distribution Inside the Piston Bowl of a 1.9 l DI Diesel Engine Using Two-Dimensional Mie Scattering” SAE Paper 922204 1992
- Winklhofer, E. Fuchs, H. Philipp, H. “Diesel Spray Combustion - An Optical Imaging Analysis” SAE Paper 930862
- Yeh, C.N. Kamimoto, S. Kobori, S. Kosaka, H. “2-D Imaging of Fuel Vapor Concentration in a Diesel Spray Via Exciplex-Based Fluorescence Technique SAE Paper 932652 1993
- Fujimoto, H. Kusano, S. Senda, J. “Distribution of Vapor Concentration in a Diesel Spray Impinging on a Flat Wall by Means of Exciplex Fluorescence Method” SAE Paper 972916 1997
- Heinze, T. Schmidt, T. 505 523 1989
- Rabenstein, F. Egermann, J. Leipertz, A. “Quantitative Analysis of Vapor Phase Structures in Transient Liquid Fuel Sprays” Proc. COMODIA '98 Kyoto July 20-23 1998
- Pitcher, G. Wigley, G. “A Study of the Breakup and Atomization of a Combusting Diesel Fuel Spray by Phase Doppler Anemometry” Proc. 6 th Int. Symposium on Applications of Laser Techniques to Fluid Mechanics 25.1.1 25.1.7 Lisbon 1992
- Arcoumanis, C. Chang, J.-C. “Flow and Heat Transfer Characteristics of Impinging Transient Diesel Sprays” SAE Paper 940678 1994
- Guerrassi, N. Champoussin, J.-C. “Experimental Study and Modeling of Diesel Spray/Wall Impingement” SAE Paper 960864 1996
- Hohmann, S. Mattes, P. Renz, U. Schneemann, A. Wirth, R. “Measurements of Droplet Size and Velocity in a DI-Diesel Spray Impinging on a Wall” Proc. ILASS '97 449 457 1997
- Stumpp, G. Ricco, M. “Common Rail - An Attractive Fuel Injection System for Passenger Car DI Diesel Engines” SAE Paper 960870 1996
- Bohn, D. Fitzky, G. Funcke, J. Holzenthal, K. “Experimentelle Untersuchung der Kraftstoffzerstäubung und -verdampfung bei der dieselmotorischen Einspritzung unter Variation der Kraftstoffeigenschaften” Proc. SFB 224 “Motorische Verbrennung” Aachen March 11-13 1993