Simulation Study on Fluid Non-Uniformity of Multi-Cylinder Diesel Engine Cooling System

The cooling water system of multi-cylinder diesel engine was discussed with software Fluent to simulate the flow field of in-line 3、4、5、6-cylinder diesel engine. The results show that, for the cooling water jacket inlet and outlet in the same end of the crankshaft inline diesel engine, from the first cylinder near the inlet to the last cylinder remote from the inlet, the pressure of the inter-water channel of each cylinder is gradually reduced, the pressure of the inlet and the outlet of each cylinder head is gradually increased, and the flow rate of each cylinder head gradually decreases. At same inlet flow, the pressure difference between the inlet and outlet of each cylinder is gradually decreased with the increase of the cylinder numbers, the flow resistance of the entire cooling jacket is reduced, the mean value of the inlet and outlet pressure difference of each cylinder head gradually decreases, the difference between the maximum and minimum flow rate in each cylinder head of the engine increases, and flow non-uniformity of each cylinder head increases significantly.