Abstract
The empirical correlations estimate the surface-averaged heat transfer coefficient in terms of the bulk gas temperature and a surface-averaged or total heat flux. The investigations have revealed that during the combustion period, the wall heat flux is locally substantial in space and time, due to the transient nature of the flame propagation. During combustion, the heat flux increases rapidly after spray impingement on the wall. A phenomenological model is proposed to predict the convective heat transfer from the spray to the wall. The analogy of Woschni is applied for the spray impinging on the combustion chamber walls. This heat transfer has a strong impact on NOx formation and combustion chamber design.
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Abbreviations
- A ring :
-
Area of an annular division (m2)
- A s :
-
Instantaneous surface area (m2)
- C* :
-
A dimensional constant
- dht/dθ:
-
Rate of heat transfer (J/degree)
- dQ/dθ:
-
Rate of heat release (J/degree)
- h c :
-
Heat transfer coefficient (W/(m2K))
- h f, ring :
-
Average heat flux for an annular division (W/m2)
- h t, ring :
-
Average heat transfer for an annular division (W)
- L :
-
Characteristic length, wall spray diameter, mean diameter of the ring (m)
- P cyl :
-
Cylinder pressure (bar)
- T cyl :
-
Temperature of the cylinder charge (K)
- T m :
-
Mean temperature of outer and inner boundaries of circular regions (K)
- T p :
-
Piston temperature (K)
- T w :
-
Wall temperature (K)
- u p :
-
Piston velocity (m/s)
- u wall :
-
Wall spray velocity (m/s)
- V inst :
-
Instantaneous cylinder volume (m3)
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Lakshminarayanan, P.A., Aghav, Y.V. (2022). Heat Transfer. In: Modelling Diesel Combustion. Mechanical Engineering Series. Springer, Singapore. https://doi.org/10.1007/978-981-16-6742-8_6
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DOI: https://doi.org/10.1007/978-981-16-6742-8_6
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