LDA and PIV Analyses of In-Cylinder Steady Flow and Verifications of Numerical Simulation Results with Partial Cells Method

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  • LDA・PIVによるシリンダ内定常流れの解析とパーシャルセル法数値計算の検証
  • LDA PIV ニ ヨル シリンダ ナイ テイジョウ ナガレ ノ カイセキ ト パーシャルセルホウ スウチ ケイサン ノ ケンショウ

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Characteristics of the flow inside an engine cylinder model have been evaluated by a particle image velocimetry (PIV) and a laser Doppler anemometer (LDA). Verifications of the results by Partial Cells in Cartesian coordinate method numerical simulation have been also made by the experiment results. The model engine head that has two intake valves and transparent cylinder are used in the steady state flow condition. The tests are conducted by single- and dual- valve open condition with 8mm valve lift in-1470 Pa suction gauge pressure. The comparisons between the PIV and the LDA experiments show almost the same tendencies for mean velocities and turbulence intensities in the whole experimental regien qualitatively and also quantitatively. The differences in the valve open condition are clearly observed in the integral length and time scales that are estimated from the PIV and LDA data respectively. It is shown that the PIV results are useful for verification of numerical results, which agree reasonably with those of experiments.

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