Using Computational Fluid Dynamics (CFD) to Simulate a Cylinder Head Flow Test

摘要

A computerized model was used to simulate a flow bench test for a cylinder head. The purpose of this study was to demonstrate a more efficient and less costly method for developing and testing cylinder head port geometry changes. Test data for the cylinder head was collected from a flow bench and was used to verify the baseline results of the CFD simulations. The intake and exhaust ports were analyzed from 0.050" of lift to 0.650" of lift at 0.100" intervals. The average error for the seven intake lift values was 7%. The absolute flow difference between the simulation and the test results ranged from 4.6 - 26.7 ft{sup}3/min. The average error for the seven exhaust lift values was 9% and the absolute flow difference ranged from 1.1 - 39.7 ft{sup}3/min. The CFD simulations agreed well with the test data, particularly in the lower valve lift regions. The simulation of the higher valve lift regions yielded flow numbers that were less than the actual flow data.