Turbine Vane Dusting Hole Relocation for Thermal Performance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In small-sized high-pressure turbine vanes with slender trailing edge cavities, the installation of dusting holes at the vane tip leads to an abnormal increase in cavity size, disrupting the thermal performance of the cooling circuit, as dust accumulation can block outlet discharge orifices and require excessive cooling air, necessitating a solution to remove dust without enlarging the trailing edge cavity.
Innovation Solution
A turbine vane design featuring a bell-shaped niche under the platform with a dusting hole that acts as a particle trap, positioned radially and connected to the air inlet, allowing dust particles to be removed via a perforation that also serves as a ventilation opening, reducing the need for a dusting hole at the vane tip and optimizing dusting air usage for cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dusting hole is installed at the tip of the trailing edge cavity in small-sized turbine vanes, then dust particles can be removed from the cooling circuit, but the cavity size abnormally increases disrupting thermal performance
Solution Approach 1:
The dusting hole is relocated from the traditional vane tip position to the root platform area, changing the spatial dimension of dust removal. This positional shift allows the dusting function to be decoupled from the trailing edge cavity, preventing the cavity from being enlarged while maintaining dust removal capability through the platform opening
Solution Approach 2:
The dust removal function is separated from the trailing edge cavity cooling system. The dusting hole is positioned in the platform region and connected to the cavity through a specific geometric configuration, allowing independent optimization of dust removal and cooling functions without mutual interference
2Temperature
If the trailing edge cavity cross section is reduced to maintain thermal performance, then cooling air flow rate decreases, but dust accumulation blocks outlet discharge orifices
Solution Approach 1:
A bell-shaped geometric feature is introduced as an intermediary structure between the dusting hole and the trailing edge cavity. This bell-shaped geometry acts as a particle trap that concentrates dust particles and directs them toward the dusting hole opening, enhancing dust removal efficiency without requiring an enlarged cavity cross section
Solution Approach 2:
The dusting system combines multiple functional elements: the bell-shaped particle trap geometry, the platform opening, and the connection to the trailing edge cavity. This composite structure integrates dust concentration, dust removal, and cooling functions in a unified design that maintains thermal performance while ensuring reliable dust evacuation
3Reliability
If multiple dusting holes are installed for each cavity to improve dust removal, then dusting air consumption increases, but cooling efficiency decreases
Solution Approach 1:
The dusting hole in the platform is designed to serve multiple functions: it acts as the dust removal opening, a cooling air inlet for the trailing edge cavity, and works in conjunction with the bell-shaped particle trap. This multi-functional design eliminates the need for separate dusting holes in each cavity, reducing total dusting air consumption while maintaining or improving cooling efficiency
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 design effectively traps and removes dust particles without increasing the vane's size, maintaining thermal performance by redirecting cooling air to utilize the dusting air for both dust removal and vane cooling, reducing the number of operations and enhancing overall cooling efficiency.
Implementation Method 1
a niche situated under the platform and in the shape of a bell, said niche opening at its top via a dusting hole that passes through said platform
Data Source
AI summary
A cooled turbine vane for a turbine engine, that includes a blade mounted on a platform carried by a base, the blade including one or more cavities formed therein for cooling air circulation, the cavity extending along the trailing edge and being supplied with cooling air by a supply duct connecting an air intake located in a lower portion of the base and the cavity of the trailing edge by defining a bend within the base. The duct includes, on an axis substantially radial relative to the air intake a bell-shaped niche located under the platform, the niche being open at a top thereof via a dusting hole extending through the platform and being defined at a foot of the base by walls extending substantially radially from the platform to close the platform laterally.