Turbomachine Pylon Cooling via Auxiliary Gas Duct
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Solution Overview
Problem
Turbomachine mounting pylons face mechanical strength and lifetime issues due to heating from hot gas streams, with existing solutions either being costly or negatively impacting performance.
Innovation Solution
A turbomachine cooler device featuring an auxiliary gas duct that takes cold gas from outside the nozzle and directs it to the pylon base, forming a protective cooling film without degrading the turbomachine's performance, and is integrated within the turbomachine to minimize size and aerodynamic disturbances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If materials that withstand thermal and mechanical stresses are used for the pylon, then the pylon can resist heating from hot gas streams, but the cost increases significantly
Solution Approach 1:
The patent introduces an auxiliary cooling duct as an intermediary element that channels cold gas between the pylon and the hot gas stream. This mediator protects the pylon from direct thermal exposure, allowing the use of less expensive materials while maintaining structural integrity under thermal stress
Solution Approach 2:
The invention employs a pneumatic cooling system where cold gas is routed through an auxiliary duct to create a protective flow between the hot exhaust and the pylon. This hydraulic/pneumatic approach uses fluid dynamics to achieve thermal protection without requiring expensive heat-resistant materials
2Strength
If stream disruptors are arranged to deflect hot gas away from the pylon, then the pylon is protected from heating, but the performance of the turbomachine is negatively impacted
Solution Approach 1:
Instead of using disruptors that interfere with the main gas flow, the patent introduces an auxiliary cooling duct as a mediator that delivers cold gas to the pylon area. This approach protects the pylon without obstructing or disrupting the primary hot gas stream, thus maintaining turbomachine performance
Solution Approach 2:
The gas flow path is segmented into the main hot gas stream for propulsion and an auxiliary cold gas stream for cooling. This segmentation allows both functions to operate independently without interference - the main stream maintains performance while the auxiliary stream provides thermal protection
3Strength
If stream disruptors are used to deflect hot gas, then the pylon is protected from heating, but the disruptors are not genuinely effective
Solution Approach 1:
The patent employs a controlled pneumatic system using the auxiliary cooling duct to deliver a targeted stream of cold gas to the pylon area. This creates a reliable thermal barrier through controlled fluid dynamics, ensuring consistent and genuine protection rather than the unreliable deflection attempted by disruptors
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
Effectively cools the pylon without impacting turbomachine performance, maintaining acceptable temperatures and extending its mechanical strength and lifetime while optimizing integration and minimizing costs.
Implementation Method 1
a pylon cooler device having at least one auxiliary gas duct having a gas inlet configured to take cold gas from outside the nozzle, and a gas outlet opening out in the vicinity of the base of the pylon
Implementation Method 2
the auxiliary duct being arranged inside a rear mount fairing... takes cold gas from outside the nozzle... effectively cools the pylon without impacting turbomachine performance, maintaining acceptable temperatures
Data Source
AI summary
A turbomachine including a nozzle extending along an axial direction and configured to convey a hot gas stream; and a mounting pylon for mounting the turbomachme, in which the pylon extends radially from a base arranged in the vicinity of the nozzle, is provided. The turbomachine includes a pylon cooler device having at least one auxiliary gas duct having a gas inlet configured to take cold gas from the outside of the nozzle, and a gas outlet opening out in the vicinity of the base of the pylon.