The manuscript presents the model of the air flow through the air inlet duct of the marine 4-stroke engine.
Presented model are computational fluid dynamic modelbased on dimensions and the construction of the real air
intake duct. The measurement parameters from real object are used to the model validation. Mentioned measurements
of the air flow are conducted by Venturi orifice for different loads of the engine and the different flow characteristics
of the air intake duct. The results from computational fluid dynamic model are useful to calibration the orifice by
setting the orifice module. The orifice module changes up to 6% of the mean values for all considered loads of the
engine and throttling’s of the air intake duct. The approximation the flow characteristic for other throttling’s of the air
intake duct was conducted also. The obtained approximation is useful tool to calculate the air flow to the engine for
the different throttling’s than measured. Linear dependence between the air mass flow and the power of the engine at
the constant engine speed was observed. The throttling of the cross section area of the air intake duct causes changing
the characteristic in accordance to a second order polynomial. The maximum error of obtained approximation
compared to measured values not excided 4% and mean error for all measured loads and throttling’s not exceeded
0.12%.
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