Abstract:
The present invention relates to a turbine arrangement driven by exhaust gases from a combustion engine (2). The turbine arrangement comprises a turbine housing (7), a turbine wheel (6) rotatably arranged in the turbine housing (7), a first volute section (15a) defining a curved flow passage (16) extending about 360° around the periphery of the turbine wheel (6), and an inner radial passage (20) directing exhaust gases radially inwardly from the flow passage (16) into a swept area (21) of the turbine wheel (6). The curved flow passage (16) has a cross section area (A) decreasing continuously in the flow direction of the exhaust gases from an initial area (A o ) at an initial angular position (α1) of the curved flow passage (16) to an end angular position (as). The flow area (A) decreases continuously with a successively reduced value from the initial angular position (α1) to an angular position (α) located at least 270° from the initial angular position.
Abstract:
Herein a four stroke internal combustion engine (2) is disclosed. The internal combustion engine (2) comprises at least one cylinder arrangement (4), an exhaust conduit (6), and at least one turbine. The cylinder arrangement (4) comprises an exhaust port arrangement (14), configured to open and close an exhaust flow area, A CYL . The cylinder arrangement (4) has a maximum volume, V MAX . The exhaust conduit (6) extends between the exhaust flow area, A CYL , and a turbine wheel inlet area, A™, of the turbine and has an exhaust conduit volume, V EXH . The exhaust conduit volume, V EXH , is≤ 0.5 times the maximum volume, V MAX . The exhaust port arrangement (1 4) is configured to expose the exhaust flow area, ACYL, at a size of at least 0.22 times the maximum volume, V MAX , when a piston (10) of the cylinder arrangement (4) is at the bottom dead centre, BDC.