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Multi-dimensional Modelling of Diesel Combustion: Applications

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Modelling Diesel Combustion

Part of the book series: Mechanical Engineering Series ((MES))

Abstract

Various successful applications have proven the reliability of using multi-dimensional CFD tools to assist in diesel engine research, design, and development. Those applications can be categorized as follows: using CFD tools to reveal details about invisible (or technically difficult and/or costly) in-cylinder processes of diesel combustion, so that guidance can be provided to improve engine designs in terms of emissions reduction and fuel economy; innovative combustion concepts can be evaluated numerically before experimental tests to reduce the number of investigated parameters and thus costs; important design parameters can be discovered by modelling engines of different sizes to establish engine size-scaling relationships and thus non-dimensionalize engine designs; by integration with optimization methodologies, CFD tools can also directly impact the design of optimum engine systems, such as piston geometry and injection parameters. Each of these aspects is described by relevant case studies in this chapter. The corresponding simulations were conducted with an improved version of the KIVA-3v2 code.

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Abbreviations

AMC:

Adaptive Multi-grid chemistry model (–)

C :

Proportionality constant (–*)

C s , C θ :

Proportional to the reduction in axial penetration and the azimuthal deflection of the spray axis, respectively, and (–*)

d 0 :

Injector nozzle orifice diameter (m)

H :

Lift-off length (m)

m :

Mass of fuel injected (kg)

N :

Engine speed (rpm)

rs :

Swirl ratio (–)

s :

Spray penetration tip length (m)

SOI:

Start of injection (degree CA)

t :

Time (s)

T a :

Ambient temperature (K)

t break :

Transient time from SOI to the jet breakup (s)

U :

Injection velocity (m/s)

u 0 :

Initial fuel jet velocity (m/s)

ZST:

Stoichiometric mixture fraction (–)

Δp :

Pressure drop across the injector (N/m2)

Δt :

Injection duration (degree CA)

θ :

Spray angle (degree)

μ a :

Dynamic viscosity of air (Pa s)

ρ a :

Air density, ambient gas density (kg/m3)

ρ l :

Liquid fuel density (kg/m3)

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Authors and Affiliations

  1. Engine Research Center, University of Wisconsin-Madison, Madison, USA

    Yu Shi & Rolf D. Reitz

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  1. Yu Shi
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  2. Rolf D. Reitz
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Correspondence to Yu Shi .

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Shi, Y., Reitz, R.D. (2022). Multi-dimensional Modelling of Diesel Combustion: Applications. In: Modelling Diesel Combustion. Mechanical Engineering Series. Springer, Singapore. https://doi.org/10.1007/978-981-16-6742-8_17

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  • DOI: https://doi.org/10.1007/978-981-16-6742-8_17

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  • Publisher Name: Springer, Singapore

  • Print ISBN: 978-981-16-6741-1

  • Online ISBN: 978-981-16-6742-8

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