FLUID DUCT, INTAKE DUCT OF INTERNAL COMBUSTION ENGINE, AND INTAKE SYSTEM OF INTERNAL COMBUSTION ENGINE PROVIDED WITH THE INTAKE DUCT

摘要

PROBLEM TO BE SOLVED: To provide a fluid duct suppressing increase in flow passage resistance in a curved part, in a fluid duct having a curved part. SOLUTION: A position g of a centroid G in a cross section along a curvature radius r direction of a flow passage 23 of the curved part 22R has a cross sectional shape biased toward an outer peripheral side of the curvature radius r direction from an intermediate position m of a full width W of the flow passage 23 in the curvature radius r direction in the cross section. COPYRIGHT: (C)2008,JPO&INPIT