Abstract
Laser Doppler velocimeter results are presented for the mean velocity and turbulence intensity measured during combustion in a research engine. The cylinder pressure and time of flame arrival at the LDV measurement volume were also recorded for subsequent application of conditional sampling techniques in the data-averaging procedure. For velocity measurements made at different locations along the path of flame propagation, it is shown how the pressure history for each individual engine cycle can be used to relate the fluid mechanics from point to point. Additional conditional sampling, using the flame arrival time, is applied to further identify a set of similar combustion events with reduced bias from cyclic variations in the combustion rate. The fluid mechanics in the engine are very complex with strong mean motions and anisotropic and nonhomogeneous turbulence. Combustion appears to amplify the turbulence in the preflame gas although the measured changes may be due, in part, to flame-induced convection of nonhomogenous turbulence.
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