Characterization of Spray Flows Under High Fuel Temperature Using Phase Doppler Anemometer
Effects of fuel temperature on the characteristics of the intermittent-cyclic spray have been experimentally clarified using the phase Doppler anemometer. The spray was initiated from the air assisted fuel injector. The injection frequency was 50Hz, and the pressures of the liquid fuel (n-heptane) and air were 250kPa and 147kPa, respectively. The fuel temperature was changed from 293K (20°C, room temperature) to 413K (140°C).
Experimental results showed that the mean velocity of the droplets increased with the fuel temperature. The Sauter mean diameter increased in the fuel temperature region from 293K to 343K for intermittent spray and from 293K to 323K for continuous steady spray. After the regions, it decreased. The droplets with higher fuel temperature and larger diameter have smaller decaying ratio of the velocity. These features are well explained by the analyses using grouped data classified by the droplet diameter or temporally divided velocity history of the intermittent spray. Evaluation of the droplet size distribution has also been performed by a log-hyperbolic (LH3) type fitting function.
KeywordsAir-Assisted injector Spray Flow PDA Fuel Temperature
Unable to display preview. Download preview PDF.
- Coghe, A. and Cossali, G. E., 1994, Phase Doppler Characterization of a Diesel Spray Injected into a High Density Gas under Vaporization Regimes, Proc. of 7th Int. Symp. on Appli. of Laser Techniques to Fluid Mech., Lisbon. Paper No. 36. 3.Google Scholar
- Kobashi, K. et al., 1990, Measurement of Fuel Injector Spray Flow of I. C. Engine by FFT Based Phase Doppler Anemometer, Proc. of 5th. Int. Symp. on Appli. of Laser Techniques to Fluid Mech., Lisbon. Paper No. 21. 2.Google Scholar
- Vannobel, F. et al. D., 1992, Phase Doppler Anemometry Measurements on a Gasoline Spray Inside the Inlet Port and Downstream of the Induction Valve: Steady and Unsteady Flow Conditions,Proc. of 6th Int. Symp. on Appli. of Laser Techniques to Fluid Mech., Lisbon. Paper No. 25.1.Google Scholar
- Obokata, T. and Long, W. Q., 1994, LDA/PDA Characterization of Conical Spray for Diesel Engine, Proc. of 6th. Int. Conference on Liquid Atomization and Spray Systems., Rouen. Paper No. IC94/90.Google Scholar
- Obokata, T. et al., 1994, PDA Analysis of Transient Spray Flows Initiated from Air Assisted Injector, Proc. of 7th Int. Symp. on Appli. of Laser Techniques to Fluid Mech., Lisbon. Paper No. 36.5.Google Scholar
- Obokata, T. et al., 1995, Characterization of Spray Flow Initiated from Air Assisted Injector Using Phase Doppler Anemometer, FED-Vol. 229 Laser Anemometry, ASME.Google Scholar
- Xu, T.–H. et al., 1991, The Three-Parameter Log-Hyperbolic Distribution and its Applications to Particle Sizing, Proc. Int. Conf. on Liquid Atomization and Sprav systems. ICLASS 91. Gaithersburg. Paper No.31, pp. 315–324.Google Scholar
- Grèhan, G. et al., 1991, Evaluation of Phase Doppler System using Generalized Lorenz-Mie Theory, Proc. Int. Conf. Multiphase Flows. Tsukuba. pp. 291–294.Google Scholar
- Rajaratnam, N., 1976 Turbulent Jets. Elsevier Scientific Publishing Company, Amsterdam.Google Scholar