Aircraft Powerplant Steam Bypass for Compressor Stability
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Solution Overview
Problem
Existing systems for introducing steam into gas turbine engines to enhance efficiency face challenges in effectively managing compressor stability and fluid mass flow, leading to potential compressor instability.
Innovation Solution
A powerplant system that includes a turbine engine core, a steam system, and a bypass system. The steam system evaporates water into steam and introduces it into the flowpath upstream of the turbine section, while the bypass system bleeds fluid from the flowpath upstream of the turbine section to regulate the mass flow and maintain compressor stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If steam is introduced into the flowpath to increase engine efficiency, then engine efficiency is improved, but compressor stability deteriorates due to increased fluid mass flow
Solution Approach 1:
The bypass system extracts excess fluid from the main flowpath upstream of the turbine section and redirects it downstream of the evaporator. This extraction prevents excessive fluid mass flow from reaching the compressor, thereby maintaining compressor stability while still allowing steam to be introduced into the flowpath to improve engine efficiency.
Solution Approach 2:
The bypass system acts as an intermediary mechanism between the steam injection point and the compressor. By providing an alternative flow path for excess fluid, the bypass system mediates the conflict between steam injection (which improves efficiency) and compressor stability requirements.
2Productivity
If steam is introduced into the flowpath to improve engine efficiency, then engine efficiency is improved, but fluid mass flow control becomes difficult
Solution Approach 1:
The flowpath is segmented into multiple routes: the main flowpath through the turbine section and the bypass path through the evaporator. The bypass system provides separate control over fluid flow in these different segments, enabling independent management of mass flow while maintaining overall engine efficiency through steam injection.
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 system effectively improves engine efficiency by introducing steam into the flowpath, while the bypass system helps to control fluid mass flow, thereby reducing the risk of compressor instability and optimizing engine operation.
Implementation Method 1
The steam system includes an evaporator disposed along the flowpath downstream of the turbine section. The steam system is configured to evaporate water into steam using the evaporator.
Implementation Method 2
The evaporator disposed along the flowpath downstream of the turbine section... evaporate water into steam using the evaporator
Implementation Method 3
The steam system is configured to condense water vapor flowing through a region of the flowpath into the water
Data Source
AI summary
A powerplant is provided for an aircraft. This aircraft powerplant includes a turbine engine core, a steam system and a bypass system. The turbine engine core includes a flowpath, a compressor section, a combustor section and a turbine section. The flowpath extends through the compressor section, the combustor section and the turbine section from an inlet into the flowpath to an exhaust from the flowpath. The steam system includes an evaporator disposed along the flowpath downstream of the turbine section. The steam system is configured to evaporate water into steam using the evaporator. The steam system is configured to introduce the steam into the flowpath upstream of the turbine section. The bypass system is configured to bleed fluid from the flowpath upstream of the turbine section to provide bleed fluid. The bypass system is configured to direct the bleed fluid into the flowpath downstream of the evaporator.