Exhaust Assembly Vortex Generators for Reverse-Flow Separation
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Solution Overview
Problem
Exhaust gases in contemporary turbo-prop engines experience separation during a 180-degree turn, leading to reduced overall exhaust system and engine performance.
Innovation Solution
Incorporation of vortex generators within the exhaust conduit's reverse flow portion, specifically designed as anti-ice scoops, to generate vortices that minimize flow separation and enhance performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If exhaust gases make an almost 180 degree turn with a low radius in the reverse flow portion, then the exhaust assembly can be shorter and lighter, but flow separation occurs which reduces exhaust system and engine performance
Solution Approach 1:
Vortex generators are installed upstream in the reverse flow portion to preliminarily energize the boundary layer before the sharp turn, creating rotational flow that delays separation and maintains performance in compact configurations
Solution Approach 2:
The vortex generators change the flow parameters by introducing controlled rotation and increasing boundary layer energy, transforming the flow state to resist separation during the 180-degree turn
2Productivity
If vortex generators are added to the exhaust conduit, then flow separation is reduced and performance is improved, but device complexity increases
Solution Approach 1:
The vortex generators are positioned to utilize the existing exhaust gas flow to generate beneficial vortices, allowing the flow itself to do the work of preventing separation without requiring additional active control systems or complex mechanisms
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
The vortex generators reduce flow separation and pressure loss, improving engine performance and allowing for shorter, lighter engine designs by maintaining high exhaust gas velocity and reducing the risk of ice formation.
Implementation Method 1
generating a vortex in the flow of combustion gas during the reversing
Implementation Method 2
scooping a portion of the combustion gas into an anti-ice scoop
Data Source
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AI summary
An apparatus and method for an exhaust assembly for a turbine engine including a reverse flow portion. The exhaust assembly can include an exhaust stub extending between an exhaust collector and an exhaust outlet to define an exhaust conduit having the reverse flow portion. A flow of combustion gases can exit the engine and travel through the exhaust assembly. The exhaust assembly can be applied to a turboprop engine.