Gas Turbine Rotor Blade Cooling Circuit with Angled Rib

The cooling circuit is divided into three separate cavities (first, second, and third cavities) with distinct pressure zones. The segmentation allows the third cavity to be fed by the second cavity through a controlled passage, enabling independent pressure management. This resolves the contradiction by allowing the third cavity to maintain adequate pressure for film cooling while being supplied from the higher-pressure second cavity.

A passage is introduced as an intermediary element connecting the second cavity to the third cavity. This passage acts as a mediator that transfers cooling air from the higher-pressure second cavity to the third cavity, enabling the third cavity to maintain adequate pressure without directly compromising the pressure balance in the second cavity. The intermediary passage resolves the pressure-deficiency problem while preserving film cooling capability.

The cooling circuit is segmented into three cavities where the second cavity serves as a pressure source and the third cavity serves as the film cooling delivery zone. This segmentation allows the second cavity (with adequate pressure) to supply the third cavity (positioned at the aft tip) without requiring the second cavity itself to be located at the tip. The segmentation resolves the spatial-pressure conflict.

A connecting passage acts as an intermediary that bridges the spatial gap between the second cavity (forward location with adequate pressure) and the third cavity (aft tip location requiring cooling). This intermediary passage enables effective film cooling at the aft tip region by transporting pressurized cooling air from the second cavity to the third cavity, resolving the location-pressure mismatch.

The cooling circuit is segmented into three pressure-zoned cavities, each capable of maintaining positive Back Flow Margin independently. This segmentation simplifies pressure control by creating discrete pressure management zones rather than attempting to control pressure uniformly across the entire blade. Each cavity can be optimized for its specific pressure requirements, reducing the complexity of overall pressure distribution control.

Each cavity is designed with local quality characteristics appropriate to its position and function. The first cavity handles root region pressure, the second cavity provides intermediate pressure, and the third cavity manages tip region pressure. This local quality approach allows each cavity to maintain adequate positive BFM for its specific location, preventing hot gas ingestion locally without requiring complex global pressure control mechanisms.