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Comparison of Computed and Measured High-Pressure Conical Diesel Sprays
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 06, 2000 by SAE International in United States
Annotation ability available
Event: SAE 2000 World Congress
To model sprays from pintle type nozzles with large hollow cone angle and high injection pressure, the correct flow field in the near region must be predicted. A new model was implemented in KIVA-3V code, which adopts the theory of steady gas jet to correct the relative velocities between the drop and gas phases, based on the existence of quasi-steady part of the conical spray and an assumption of equivalent gas jet. Accordingly, the structure of the sprays is defined into three parts: 1. initial part that the gas phase velocity is set to the assumed gas injection velocity; 2. quasi-steady part where the component of velocity in the symmetric line direction of the spray is corrected; 3. stagnation part which is left unchanged. This new model is referred to as the Relative Velocity Correction (RVC) model, and is a set of empirical equations that calculate the sectional distribution of the gas-phase velocity along the symmetric line of the sprays.
The high-pressure conical diesel sprays with different ambient pressures (0.1, 1.0 and 2.0 MPa) have been numerically and experimentally studied. The computational results compared to experimental data, including penetration, photographic comparison, and drop size. The structure of the spray, such as gas entrainment and spray oscillation, has been clearly revealed. It was found that behavior of the conical sprays is much more sensitive to the ambient pressure increase than that of the solid sprays.
CitationYang, X., Takamoto, Y., Okajima, A., Obokata, T. et al., "Comparison of Computed and Measured High-Pressure Conical Diesel Sprays," SAE Technical Paper 2000-01-0951, 2000, https://doi.org/10.4271/2000-01-0951.
- Hu, G., Xu F. and Song Z., “Premix Film Rtype Compression Ignition Combustion”, SAE 920694, 1992
- Sasaki, S., Harada, A., Miyamoto, T., Akagawa, H. and Tsujimura, K., “Analysis of Fuel Spray Characteristics for Premixex Lean Diesel Combustion”, JSAE 9740505, 1997
- Reitz, R. D. and Diwakar, “Effect of Drop Breakup on Fuel Sprays”, SAE 860469, 1986
- Rizk, N. K. and Lefebvre, A. H., “Internal Flow Characteristics of Simplex Swirl Atomizers”, J. Propulsion, Vol.1, No.3, 1985
- Miyamoto, T. and Kobayashi, T. and Matsumoto, Y., “Structure of Sprays from an Air-Assist Hollow-Cone Injector”, SAE 960771, 1996
- Obokata, T., Long, W. Q. and Ishima, T., “PDA and LDA Measurements of Large Angle Hollow Cone Spray Proposed for Hot-Premixed Combustion Type Diesel Engine”, SAE 960772, 1996
- Long, W. Q., Murakami, A., Hama, J. and Obokata T., “Analysis of Spatial Dispersion Characteristics of Improved Conical Sprays”, The Fourth International Symposium COMODIA 98, pp.483-488, 1998
- Ynag, X., Takamoto, Y. and Okajima, A., “Improvement of Three-Dimensional Diesel Spray Modeling in Near Region with Coarse Mesh”, SAE2000-01-0274, 2000
- Amsden, A. A., O'Rourke, P. J. and Butler, T. D., “KIVA-II: A Computer Program for Chemically Reactive Flows With Sprays”, Los Alamos National Laboratory Report LA-11560-MS, LOS ALAMOS, NM, 1989
- Amsden, A. A., “KIVA-3V: A Block-Structured KIVA program for Engines with Vertical or Canted Valves”, Los Alamos National Laboratory Report LA-13313-MS, LOS ALAMOS, NM, 1997
- Obokata, T., Hashimoto, T. and Takahashi, H., “LDA Analysis of Diesel Spray and Entrainment Air Flow”, International Symposium COMODIA 90, pp. 231-236, 1990
- Araneo, L., Coghe, A., Brunello, G. and Cossali, G. E., “Experimental Investigation of Gas Density Effects on Diesel Spray Penetration and Entrainment”, SAE 1999-01-0525, 1999
- Rajaratnam, N., “Turbulent Jets”, Elsevier Scientific Publishing Company, Amsterdam, 1976