Three Dimensional Velocity Measurements by Laser Anemometry in a Diesel Engine Cylinder Under Steady State Inlet Flow Conditions

Three dimensional velocity measurements of the in-cylinder aerodynamics in the steady airflow rig for two different Diesel cylinder heads were obtained by laser anemometry.

Complex recirculating flows with high mean velocity gradients were found while the fluctuating component of velocity was relatively constant.

Vector addition of two components in turn allowed rapid comparison to be made of the airflow characteristics between cylinder heads and and comparison with earlier hot wire and vane anemometer measurements. The directed port cylinder head was found to produce two main vortices whereas a cast helical port produced a flow which approached simple solid body rotation.