| 摘要 |
PROBLEM TO BE SOLVED: To prevent generation of a great difference in exhaust gas flow rate among a plurality of surfaces contacted with exhaust gas without greatly lowering the flow rate of the exhaust gas even on a downstream side.SOLUTION: In a tube 2 through which exhaust gas flows, a first flat plate part 21 is disposed to abut on the inner wall of the tube 2. The first flat plate part 21 includes a surface inclined in an exhaust gas flowing direction by cutting-up and a first projection 31 and a second projection 32 are formed whose inclining directions are opposite each other. The projections 31 and 32 have larger projection sizes from the first flat plate part 21 as they advance respectively in the flowing-direction upstream side of the exhaust gas. The first projection 31 and the second projection 32 are, for example, alternately arranged in the flowing direction of the exhaust gas. |
