Numerical Simulation of Internal Combustion Engine Flows Development and Testing of Turbulence and Swirling Flow Capability.

摘要

The simulation of internal combustion engine flows provides both a unique challenge and opportunity for state-of-the-art models and numerical simulation techniques. The complexity of the simulation task is balanced by the promise of delivering new insights into the important reactive flow processes occurring and, hence, into the concomitant improvement in our ability to design engines that control those processes in a fuel efficient and low pollutant output manner. The goal of the project, for which the present report applies, was to develop, verify, and apply a numerical simulation technique for in-cylinder flow. This report represents the first in a series of reports which document the degree of progress made relative to that goal. In the following sections, the engine simulation model and the technical developments of the present effort are described. Those technical developments relate to the implementation, testing, and validation of two important model capabilities: turbulent transport and swirl flow modeling. The present report is composed of three main sections. The overall model equations are presented in Section 2 followed by a summary discussion of the numerical simulation approach in Section 3. Section 4 contains the principal results of the current effort including discussion of the turbulence model with initial test calculations and the application of the model to important and realistic but idealized IC engine flows. Finally, a summary discussion and plans for the continuing effort are presented in Section 5. 6 refs., 33 figs.