Impeller of centrifugal compressor
Interference of a leakage vortex flow generated at the tip end side of the full blade with the leading edge of the splitter blade is avoided and high pressure ratio and enhanced efficiency can be achieved. A throat of am impeller is formed so that a distance from a leading edge of a rear side full blade on the rear side of the rotation direction of the compressor to a front side full blade adjacent to the rear side full blade is minimized, and the leading edge of the splitter blade is placed in a fluid flow streaming along the flow passage between the mutually adjacent full blades, on the downstream side of a leakage vortex line formed to connect the middle location of the throat to the leading edge of the front side full blade.
1. An impeller of a centrifugal compressor, the impeller comprising:
a plurality of full blades provided from a fluid inlet side to a fluid outlet side on a hub surface, the full blades being provided side by side;
a plurality of splitter blades provided in a flow passage formed between a pair of the mutual adjacent full blades from a part way of the flow passage to the outlet side,
wherein,
in a cross section view depicting a geometry along a tip end curve of the full blades, a leading edge of the splitter blade is placed in a fluid flow streaming along the flow passage between the full blades, on the downstream side of a leakage vortex line formed to connect the middle location of a throat to the leading edge of a front side full blade, the throat being formed so that a distance from a leading edge of a rear side full blade located on the rear side of the rotation direction of the centrifugal compressor to a blade suction surface of the front side full blade adjacent to the rear side full blade and located on the front side of the rotation direction is minimized.
2. The impeller of the centrifugal compressor according to claim 1 , wherein a tip end side in the blade height direction of the leading edge of the splitter blade is inclined toward the front side full blade.
3. The impeller of the centrifugal compressor according to claim 2 , wherein the inclination angle toward the front side full blade is increased by 5 to 8 degrees with regard to the inclination angle along the rear side full blade.
4. The impeller of the centrifugal compressor according to claim 2 , wherein the leading edge of the splitter blade is shifted toward the front side full blade so that the leading edge is closer to the front side full blade in the hoop direction than the middle location between the front side full blade and the rear side full blade.
5. The impeller of the centrifugal compressor according to claim 1 , wherein the leading edge of the splitter blade is shifted toward the front side full blade so that the leading edge is closer to the front side full blade in the hoop direction than the middle location between the front side full blade and the rear side full blade.