The flow within a one-cylinder four-valve combustion engine is measured via cycle resolved 2C/2D particle-image velocimetry (PIV) and laser Doppler anemometry (LDA). The velocity field is recorded in eight measurement planes within the cylinder for several of crank angles during the intake and compression phase by PIV. Furthermore, LDA measurements are performed at four different points within the cylinder during the intake and compression phase. The results include a short description of the basic characteristics of the complete in-cylinder flow field and a detailed analysis of the temporal evolution of the flow in the measurement points. The comparison of the findings of the two measurement techniques shows that planar PIV measurements are capable of analyzing the spatial structure of the flow field whereas LDA measurements have a better temporal resolution, i.e., provide a detailed analysis of the temporal development of the flow in single measurement points. Thus, the LDA measurements can be used to identify crank angles where more detailed PIV measurements will lead to a better understanding of the complete in-cylinder flow field.
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