Application of the discrete ordinates method to compute radiant heat loss in a diesel engine
- Purdue Univ., West Lafayette, IN (United States)
- Univ. of Basilicata, Potenza (Italy). Dept. of Environmental Engineering and Physics
A three-dimensional model for computing flows, sprays, and combustion in internal combustion engines is modified to include radiant heat loss. Radiant heat loss is computed by solving the radiative transport equation using a discrete ordinates approximation method. Such a method solves the radiative transport equation for a set of discrete directions spanning the range of 4{pi} solid angle. Angular integrals of intensity are discretized by numerical quadrature. The resulting discrete ordinates equations are numerically solved by using a finite volume approach in contravariant formulation. Computations are made with and without radiant heat loss in a diesel engine, and the effects of the radiant heat loss on the computed temperature and NO and soot concentrations are discussed. Inclusion of radiant heat loss reduces the peak temperature by about 10%. As a result, the predicted frozen NO concentrations are found to be lowered. However, the soot concentrations are not significantly altered.
- Sponsoring Organization:
- National Science Foundation, Washington, DC (United States); Ministero dell`Universita` e della Ricerca Scientifica e Tecnologica (Italy); Consiglio Nazionale delle Ricerche, Rome (Italy)
- OSTI ID:
- 500895
- Journal Information:
- Numerical Heat Transfer. Part A, Applications, Vol. 31, Issue 6; Other Information: PBD: 9 May 1997
- Country of Publication:
- United States
- Language:
- English
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