1-D Modeling of Transient Engine Operations Using Data Generated by a CFD Code

Jan Macek; Oldřich Vítek; Seshasai Srinivasan; Franz. X. Tanner

doi:10.4271/2008-01-0357

2008-04-14

1-D Modeling of Transient Engine Operations Using Data Generated by a CFD Code 2008-01-0357

Transient engine operations are modeled and simulated with a 1-D code (GT Power) using heat release and emission data computed by a 3-D CFD code (Kiva3). During each iteration step of a transient engine simulation, the 1-D code utilizes the 3-D data to interpolate the values for heat release and emissions.

The 3-D CFD computations were performed for the compression and combustion stroke of strategically chosen engine operating points considering engine speed, torque and excess air. The 3-D inlet conditions were obtained from the 1-D code, which utilized 3-D heat release data from the previous 1-D unsteady computations. In most cases, only two different sets of 3-D input data are needed to interpolate the transient phase between two engine operating points. This keeps the computation time at a reasonable level.

The results are demonstrated on the load response of a generator which is driven by a medium-speed diesel engine.

This approach considerably improves the emissions-prediction capability of the 1-D code for transient engine operations, and thus improves the accuracy of standardized road test cycles.

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1-D Modeling of Transient Engine Operations Using Data Generated by a CFD Code 2008-01-0357

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