Turbulent Flow in Spark Ignition Engine Combustion Chambers

The development of a hot wire anemometry system to study the turbulent flow conditions in spark ignition engine combustion chambers is described. Measurements of a ‘mean’ flow velocity and a fluctuating flow velocity within certain frequency bandpass ranges are reported under ‘motoring’ engine conditions during the ‘combustion period’ of the engine cycle. Two types of combustion chamber design have been investigated - a ‘squish’ design and a cylindrical disc design.