Impeller Blade Angle Distribution for Centrifugal Compressor Efficiency
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Solution Overview
Problem
Rotating machines, such as centrifugal compressors, face challenges in achieving both high lift and high efficiency simultaneously, as existing techniques struggle to optimize blade angles for both performance metrics.
Innovation Solution
The impeller design features a blade angle distribution with a gradual increase and decrease region, including a partial gradual decrease region with a smaller decrease amount than the increase amount, and a partial gradual increase region, to suppress secondary flow curling and reduce energy loss, allowing for higher lift and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the blade angle is increased to achieve high lift, then the lift performance is improved, but secondary flow interference increases causing efficiency to deteriorate
Solution Approach 1:
The patent applies local quality by creating distinct regions along the blade with different angle characteristics: a gradual increase region, a gradual decrease region, and a partial gradual decrease region with smaller decrease amount. Each region is optimized for its specific function - the gradual increase region builds lift while the partial gradual decrease region suppresses secondary flow curling, thereby achieving both high lift and high efficiency through localized blade angle optimization
Solution Approach 2:
The patent implements dynamics by designing the blade angle distribution to dynamically change along the blade length rather than maintaining a uniform or simply linear gradient. The blade angle first gradually increases, then gradually decreases, and finally undergoes a partial gradual decrease with smaller magnitude, creating a dynamic angle profile that adapts to different flow conditions at different blade positions to simultaneously achieve high lift and suppress secondary flow interference
2Power
If the blade angle distribution is optimized for high lift, then lift performance is improved, but it becomes difficult to achieve high efficiency simultaneously
Solution Approach 1:
The patent applies parameter changes by systematically varying the blade angle parameter along the blade length according to a specific distribution pattern. The blade angle changes from gradual increase to gradual decrease to partial gradual decrease, with each region having controlled rate of change. This parameter optimization allows the blade to generate high lift while minimizing secondary flow interference, thereby achieving both high lift performance and high efficiency
Solution Approach 2:
The patent implements segmentation by dividing the blade into three distinct angular regions: a gradual increase region, a gradual decrease region, and a partial gradual decrease region. Each segment serves a specific function in the overall blade performance - the first builds angle for lift generation, the second reduces angle to control flow, and the third provides a controlled partial reduction to suppress secondary flow while maintaining lift, thereby achieving both high lift and high efficiency through segmented optimization
Data Source
AI summary
An impeller with a disc that rotates about an axis, and blades a plurality of which are disposed in the circumferential direction of the disc with intervals therebetween. A defined blade angle of the blade has a prescribed gradual increase region and gradual decrease region from the center towards the outside, and at the center of an inflection region of the gradual increase region and of the gradual decrease region, provided is a partial gradual decrease region having a smaller blade angle decrease amount than the blade angle increase amount of the gradual increase region.