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Investigation on an Injection Strategy Optimization for Diesel Engines Using a One-Dimensional Spray Model

Author

Listed:
  • Intarat Naruemon

    (College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China)

  • Long Liu

    (College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China)

  • Qihao Mei

    (College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China)

  • Xiuzhen Ma

    (College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China)

Abstract

Common rail systems have been widely used in diesel engines due to the stricter emission regulations. The advances in injector technology and ultrahigh injection pressure greatly promote the development of multiple-injection strategy, leading to the shorter injection duration and more variable injection rate shape, which makes the mixing process more significant for the formation of pollutant emission. In order to study the mixing process of diesel sprays under variable injection rate shapes and find the optimized injection strategy, a one-dimensional spray model was modified in this paper. The model was validated by the measured spray penetrations based on shadowgraphy experiments with the varying injection rate. The simulations were performed with five injection rate shapes, triangle, ramping-up, ramping-down, rectangle and trapezoid. Their spray penetrations, entrainment rates and equivalence ratios along spray axial distance are compared. The potentials of multiple-injection and gas-jet after end-of-injection (EOI) to improve mixing process and emission reduction are discussed finally. The results indicated that ramping-up injection rate obtains the highest entrainment rate after EOI, and it needs 1.5 times of injection duration for the entrainment wave to arrive at the spray tip. For the other four injection rates, the sprays can be treated as a steady-like state, needing twice of injection duration from EOI to the time the entrainment wave reaches the spray tip. The multiple-injection with proper injection rate shape enhanced the entrainment rate, and the gas-jet after EOI affected the mixture distribution and entrainment rate in spray tail under ramping-down injection rate.

Suggested Citation

  • Intarat Naruemon & Long Liu & Qihao Mei & Xiuzhen Ma, 2019. "Investigation on an Injection Strategy Optimization for Diesel Engines Using a One-Dimensional Spray Model," Energies, MDPI, vol. 12(21), pages 1-19, November.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:21:p:4221-:d:283917
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    References listed on IDEAS

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