| 摘要 |
A heat exchanger apparatus for a liquid-cooled internal combustion engine including a radiator axially spaced from the engine, an engine-driven, suction-type fan axially spaced intermediate the engine and the radiator for drawing cooling air axially through the radiator, fan shroud means shaped and positioned with respect to the radiator and blades of the fan whereby the air stream discharged by the fan is in a radial outward direction, and an air baffle positioned intermediate the fan and engine for mitigating air recirculation in the fan hub region; the fan shroud structure is formed to provide a generally cylindrical exit throat section (CF), a radial flat discharge section (RF), and a radial expander or diverging section (R), serving as a transition between the throat section and the discharge section, and wherein the impeller blades of the fan have a projected or effective axial width (AW); the various shroud structure sections are dimensioned with respect to such projected or effective axial width (AW) of the fan blades and the fan blades are positioned with respect to the shroud structure sections in the following manner: CF=AW/3, RF=AW/3, R=2AW/3, and the radial plane defining one axial limit of the projected or effective axial width (AW) of the fan blades substantially contains the radial discharge section (RF).
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