Evaluation of In-cylinder Gas Flow in CI Engine Using PIV Measurement and Improvement of On-board Wall Heat Transfer Prediction Model

For the improvement of the transient driving performance of a diesel engine, it is useful to control the fuel injection timing and quantity using model-based control (MBC). The authors previously developed the on-board in-cylinder gas flow model and the wall heat transfer prediction model, which are a part of the models for MBC. However, the developed gas flow model contains an undecided constant called as turbulence intensity coefficient (TIC), which has the significant effect on the wall heat transfer prediction model. The present study evaluated the TIC by using the in-cylinder gas flow velocities obtained from the PIV measurements, which were measured at multiple planes and were analyzed by separating the velocity to mainstream and turbulent components. Furthermore, the authors compared between the heat fluxes from the experiments and those from the model with the TIC, and it was found that the model with the coefficients obtained by using velocities at the lower part of cylinder was agreed with the experiments, because the error ratio was evaluated to be -4.7%. Finally, for the identification of the TIC without any experiment, the authors calculated the TIC using velocities at the lower part of cylinder obtained by CFD analysis. It was obvious that the heat fluxes from the model with the TIC was agreed with the experiments, because the error ratio was evaluated to be -3.8%.

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  • English
  • Japanese

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  • Accession Number: 01733556
  • Record Type: Publication
  • Source Agency: Japan Science and Technology Agency (JST)
  • Files: TRIS, JSTAGE
  • Created Date: Mar 19 2020 10:22AM