Impeller wheel for a centrifugal turbocompressor

An impeller wheel of a turbocompressor, for rotation around an axis, comprising:

• an inlet cross section for the axial inflow of a process fluid into the impeller wheel,
• an exit cross section for the radial exit of the process fluid from the impeller wheel,
• a wheel disk which defines a hub-side deflection contour from the axial flow direction to the radial flow direction,
• blades, attached on the wheel disk, which define flow passages from a leading edge to a trailing edge in the circumferential direction, at least over a part of the flow path of the process fluid through the impeller wheel,
• wherein the blade leading edge forms an angle of between 35° and 45°, with a radial plane,
• wherein each blade, on an extent end edge which is proximal to the wheel disk, defines a linear inner track extending in the flow direction in such a way that orthogonally equal distances to a blade surface on a pressure side and a suction side of the blade exist on both sides of the inner track,
• wherein the blade, on an extent end edge which is distal to the wheel disk, defines a linear outer track extending in the flow direction in such a way that orthogonally equal distances to a blade surface on the pressure side and the suction side of the blade exist on both sides of the outer track,
• wherein a relative blade length for each position on a track, which is an inner track or outer track, is defined in each case as a proportion of the blade lengths located upstream of this position to the overall blade length of the subject track, specifically inner track or outer track,
• wherein a meridional angle for each position of a track is defined as the upstream included angle between a meridional plane through this position and a tangent to the track,
• wherein in the region of between 10% and 90% of the relative blade length a local extremum of the meridional angle of the inner track exists.