Centrifugal Compressor Impeller Blade Height Ratio
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Solution Overview
Problem
Centrifugal compressor impellers face inefficiencies due to the generation of secondary flows, which lead to non-uniform flow distribution and increased energy loss, hindering the achievement of high pressure ratios and efficiency.
Innovation Solution
The design incorporates a centrifugal compressor impeller with a hub, full blades, and splitter blades where the blade height ratio of the splitter blades to the full blades is less than 1 at the leading edge, effectively suppressing secondary flow generation and leakage flow interference, ensuring uniform flow distribution and high efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If splitter blades are provided between full blades to improve flow distribution, then impeller efficiency should improve, but non-uniform flow rate between passages occurs due to higher flow velocity on the suction side
Solution Approach 1:
The invention applies different blade heights to different types of blades (full blades versus splitter blades) to create locally optimized flow control. Specifically, the splitter blades have a smaller blade height than the full blades, which allows the splitter blades to guide flow more effectively without creating excessive blockage that would cause non-uniform flow distribution between passages.
Solution Approach 2:
The invention changes the geometric parameter of blade height to optimize performance. By setting the blade height of splitter blades to be smaller than that of full blades (blade height ratio ≤ 0.95), the invention achieves better flow distribution and reduced secondary flows while maintaining or improving impeller efficiency.
2Stability of the object's composition
If the blade height ratio of splitter blades to full blades is increased to improve flow guidance, then flow distribution improves, but secondary flow generation increases leading to energy loss
Solution Approach 1:
The invention optimizes the blade height ratio parameter to balance flow distribution and secondary flow suppression. By setting the blade height ratio (hs/hf) to 0.95 or less, the invention achieves effective flow guidance while minimizing the generation of secondary flows that would cause energy loss.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration significantly reduces secondary flow generation, achieves uniform flow distribution, and enhances impeller efficiency by blocking the flow and leakage interference, resulting in improved pressure ratios and operational efficiency compared to conventional designs.
Implementation Method 1
the flow A2 entering the axis side (inner side, hub 18 side) of the impeller 6 is gradually directed outward by centrifugal force and tilted little by little with respect to the direction of the axis O1
Data Source
AI summary
An impeller of a centrifugal compressor according to the present disclosure includes: a hub; a plurality of full blades disposed on a peripheral surface of the hub at intervals in a circumferential direction; and a plurality of splitter blades each of which is disposed between adjacent full blades of the plurality of full blades on the peripheral surface of the hub. When a blade height ratio which is a ratio of a blade height (Hf) of each full blade to a blade height (Hs) of each splitter blade on a meridional plane of the impeller is defined as Hs/Hf, the blade height ratio satisfies Hs/Hf<1 at least at a leading edge of each splitter blade.