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Effects of wall wetting and in-cylinder fuel distribution in an advanced turbo-charged engine

先进涡轮增压发动机的壁润湿和缸内燃料分配

  • The 2nd World Congress on Internal Combustion Engines
  • Published:
Journal of Central South University Aims and scope Submit manuscript

Abstract

One of the proposed concepts for spark ignition engines is advanced port fuel injection (APFI), which suggests using two port injectors for each cylinder. In this research, we numerically examine the capabilities of this concept in reducing fuel consumption and increasing engine performance. The results demonstrated that the use of this concept is very effective due to the use of two injectors and the possibility of reducing the spraying time and bringing the injection start time closer to the air inlet valve opening time. The maximum amount of fuel film formed on the walls is reduced by about 75%, naturally, which leads to better and more homogeneous fuel distribution inside the combustion chamber and increases combustion efficiency. The results showed that under the same boundary conditions and engine operating point, the use of two port injectors for each cylinder leads to an increase of more than 20% of the maximum combustion chamber pressure and about 4% combustion efficiency. On the other hand, fuel film formation becomes worse in cold conditions. So in this study, the capabilities of this concept in cold conditions were investigated too. Investigations have shown that the advanced port fuel injection, unlike conventional engines, is almost insensitive to inlet temperature changes.

摘要

关于火花点火发动机的建议概念之一是先进的进气道燃油喷射(APFI),建议每个气缸使用两个进气道喷射器。在这项研究中,通过数字检查来评估此概念在减少燃油消耗和提高发动机性能方面的能力。结果表明,使用两个喷射器,可以缩短喷射时间,并使喷射开始时间更接近进气阀打开时间,说明使用此概念是非常有效的。在壁上形成燃料膜的最大质量可减少75%,这导致燃料在燃烧室内更好,更均匀地分布,从而提高了燃烧效率。在相同的边界条件和发动机工作点,每个气缸使用两个进气道喷射器可导致燃烧室压力提高20%,燃烧效率提高4%。但在寒冷条件下燃料膜的形成变得更糟,在本文中,也研究了这种概念在寒冷条件下的能力。研究结果表明,与传统发动机不同,先进的进气道燃油喷射对进气温度变化几乎不敏感。

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Abbreviations

AMR:

Adaptive mesh refinement

APFI:

Advance port fuel injection

ATDC:

After top dead center

BDC:

Bottom dead center

BTDC:

Before top dead center

CA:

Crank angle

CFD:

Computational fluid dynamics

c p :

Specific heat capacity

p :

Pressure

PFI:

Port fuel injection

Pr t :

Prandtl number

S :

Source term in mass transport equation

T :

Temperature

TDC:

Top dead center

u :

Velocity

Y m :

Mass fraction of species m

δ ij :

Kronecker delta

D :

Diffusion coefficient

E :

Specific internal energy

GDI:

Gasoline direct injections

H m :

Species enthalpy

k :

Turbulent kinetic energy

K t :

Turbulent conductivity

ε :

Turbulent dissipation

μ :

Viscosity

μ t :

Turbulent viscosity

ρ :

Density

σ ij :

Stress tensor

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Authors and Affiliations

  1. School of Automotive Engineering, Iran University of Science and Technology, Narmak, Tehran, 1311416846, Iran

    A. Rostampour, G. R. Molaeimanesh & A. Safaei-Arshi

  2. School of Mechanical Engineering, Iran University of Science and Technology, Narmak, Tehran, 1311416846, Iran

    M. H. Shojaeefard

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  1. A. Rostampour
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  2. M. H. Shojaeefard
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  3. G. R. Molaeimanesh
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Contributions

ROSTAMPOUR A provided the concept and wrote the first draft of the manuscript. SHOJAEEFARD M H edited the draft of manuscript. MOLAEIMANESH G R edited the draft of manuscript. SAFAEI-ARSHI A conducted the literature review.

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Correspondence to M. H. Shojaeefard.

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Conflict of interest

ROSTAMPOUR A, SHOJAEEFARD M H, MOLAEIMANESH G R and SAFAEI-ARSHI A declare that they have no conflict of interest.

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Rostampour, A., Shojaeefard, M.H., Molaeimanesh, G.R. et al. Effects of wall wetting and in-cylinder fuel distribution in an advanced turbo-charged engine. J. Cent. South Univ. 29, 2165–2178 (2022). https://doi.org/10.1007/s11771-022-5087-5

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