Effects of Model Parameters on Spray Characteristics of Gasoline Direct-Injection Engines

Abstract:

This paper investigates the effects of turbulence model parameter， one-way coupling model parameter， and break-up model parameters on spray penetration and droplet size based on the VOF-spray one-way coupling model. The results indicate that the RANS constant C_ε1 and the RT model size constant C_RT have the greatest effect on the spray penetration， and size constants C_KH and C_RT have the greatest effect on the droplet size. Based on the above analysis， it establishes a high precision spray model for different working conditions. The error between experiment and simulation is within 3% for standard Spray G condition， and around 10% error for different ambient gas densities.

Key words:engine;model parameters;spray penetration;droplet size