Turbo Machine Blade Root Insert for Cooling and Load Distribution
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Solution Overview
Problem
Existing turbo machine blades face challenges in manufacturing simplicity and achieving uniform load distribution within the root body, which is critical for withstanding high mechanical loads and efficiently circulating cooling fluid.
Innovation Solution
A blade design featuring an airfoil body with an inner cavity and a root body that includes a receiving slot for an insert with through holes, allowing for simplified casting and improved load distribution, along with enhanced cooling fluid circulation and mechanical damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If multiple openings are provided in the root body for cooling fluid circulation, then cooling efficiency is improved, but load distribution uniformity deteriorates
Solution Approach 1:
The invention divides the cooling fluid circulation system into two independent parts: (1) the inner void extending from the airfoil body into the root body, and (2) the receiving slot with insert providing additional openings. This segmentation allows the inner void to provide cooling without compromising root body integrity, while the insert provides controlled openings for additional cooling pathways.
Solution Approach 2:
The receiving slot acts as an intermediary structure that connects the inner void to the exterior environment. By providing this intermediate pathway, cooling fluid can circulate through the root body without creating direct openings that would compromise structural integrity and load distribution.
2Use of energy by moving object
If the root body is designed with multiple openings for cooling, then cooling fluid circulation is improved, but manufacturing complexity increases
Solution Approach 1:
The cooling system is segmented into the cast-in inner void and the separately manufactured insert with receiving slot. This allows the root body to be cast with a simple structure, while the insert (containing the complex opening geometry) is manufactured separately and then assembled, reducing overall manufacturing complexity.
Solution Approach 2:
The insert is nested within the root body structure, with the receiving slot accommodating the insert containing the through holes. This nested arrangement allows the complex opening geometry to be housed within the simpler cast root body structure.
3Ease of manufacture
If the inner void opens at the root body for core removal, then manufacturing simplicity is improved, but structural integrity deteriorates
Solution Approach 1:
The receiving slot serves as an intermediary structure that provides access to the inner void for core removal during manufacturing, while the insert fills this slot to restore structural integrity in the finished product. The slot acts as a temporary manufacturing feature that is later compensated for.
Solution Approach 2:
The root body has different local qualities: the main root body structure maintains high structural integrity, while the receiving slot area provides localized access for manufacturing purposes. The insert further enhances this by providing localized strength where the slot creates an opening.
Data Source
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AI summary
A blade for turbo machine, in particular for a gas turbine, includes an airfoil body extending in a radial direction between a root end and a tip end, the air foil body comprising an inner cavity or void that extends from the root end in the radial direction, a root body integrally formed with the airfoil body and extending from the root end of the air foil body to a bottom end in the radial direction, the root body comprising a receiving slot extending from the bottom end in the radial direction and opening into the inner void of the air foil body, and an insert positioned within the receiving slot of the root body, the insert comprising a plurality of through holes extending in the radial direction to form a fluid connection to the inner void.