Abstract
The rate of heat release in an indirect injection engine is modelled on the lines of the observed rate in a direct injection engine. The premixed burning is assumed to take place only in the prechamber. The diffusion burning was modelled to be proportional to the modelled rate of air entrainment and available fuel. The diffusion burning is stopped in the auxiliary chamber, once all the air in it is consumed. Comparison of experimental data with the results of simulation over a wide range of speed and load was encouraging. Different engine parameters were varied, and their effects on engine performance are discussed.
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Abbreviations
- A :
-
A coefficient in expression for fmep, 0.06898 (bar)
- A :
-
Geometrical area of the orifice (m2)
- A :
-
Arrhenius pre-exponent, 2.58 \(\times\) 10–4 (–)
- B :
-
A coefficient in expression for fmep, 0.02897 (bar/rps)
- C :
-
A coefficient in expression for fmep, 4.008 \(\times\) 10–3 (bar/(m/s)2
- C :
-
Concentration of fuel in the chamber from which the mass transport takes place (–)
- C D 1 , C D 2 :
-
Constants describing the rate of diffused combustion (–)
- C m :
-
Mean piston speed (m/s)
- C P 1 :
-
A constant dependent on the delay period describing premixed combustion (–)
- C P 2 :
-
A constant for all engines, describing premixed combustion, 5000 (–)
- D c :
-
Discharge coefficient of the orifice (–)
- dmd/dτ:
-
Rate of diffusion burning (kg/non-dimensional time)
- dmdx/dτ:
-
Rate of diffusive burning in chamber X (kg/non-dimensional time)
- dmP/dτ:
-
Rate of the burning of premixed fuel (kg/non-dimensional time)
- dmx/dτ:
-
Rate of transport of gases to the chamber from the adjoining chamber (kg/non-dimensional time)
- E :
-
Arrhenius pseudo activation energy 38,689 (kJ/mol)
- fmep:
-
Friction mean effective pressure (bar)
- m :
- m d (t) :
-
Fuel quantity that would burn diffusively after t seconds (kg)
- m f :
-
Total injected fuel. (kg)
- N :
-
Engine speed (rpm)
- n :
- p :
- P 1 :
-
Upstream pressure (Pa)
- P 2 :
-
Downstream pressure (Pa)
- P I :
-
Prechamber pressure (bar)
- q :
-
A constant in Eq. (7.11) (–)
- q, m, n, p :
-
Constants for a given engine (–)
- r :
-
A constant in Eq. (7.12) (–)
- R u :
-
Universal gas constant, 8.32 (kJ/kmol K)
- T 1 :
-
Upstream temperature (Pa)
- T I :
-
Prechamber temperature (K)
- U p :
-
Crank speed (rev/s)
- x :
-
I refers to the auxiliary chamber, II refers to the main chamber (–)
- β :
-
Premixed fuel fraction (fraction of fuel mixed with air during the delay) (–)
- δ :
-
Ignition delay (ms)
- λ :
-
Relative air–fuel ratio (–)
- Ï„ :
-
Time, non-dimensionalized with respect to nominal combustion duration (–)
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Lakshminarayanan, P.A., Aghav, Y.V. (2022). Heat Release in Indirect Injection Engines. In: Modelling Diesel Combustion. Mechanical Engineering Series. Springer, Singapore. https://doi.org/10.1007/978-981-16-6742-8_7
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DOI: https://doi.org/10.1007/978-981-16-6742-8_7
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