A holographic particle-image velocimetry (HPIV) system is developed to investigate the in-cylinder air flow in a motored four-valve engine operated at 1,500 rpm. Image aberrations introduced by the optical liner of the engine are optically eliminated. The use of a reference hologram to compensate for errors induced by fine reference beam misalignments is described. The remaining errors are quantitatively discussed in the text. The application of a wavelength selected laser diode for hologram reconstruction is discussed. High-resolution velocity measurements of the in-cylinder flow are made in axial planes during the intake and compression stroke. Prospects and limitations to full three-dimensional extensions of the HPIV system are discussed. The results show with emphasis on large- and small-scale flow structures the HPIV system to be a reliable diagnostic tool for internal combustion engines.
Experiments in Fluids – Springer Journals
Published: Dec 17, 2002
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