Spherical Plug Valves for Constant-Volume Combustion Chambers
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Solution Overview
Problem
Conventional constant-pressure combustion chambers in aircraft turbine engines face issues with robustness and tightness, particularly during high pressurization, which affects the performance and service life of the valves.
Innovation Solution
The use of spherical plug valves that rotate in a coordinated manner to control gas flow, providing high robustness and tightness, and enabling efficient operation of the Humphrey cycle phases, with features like contra-rotating spherical bodies and sealing elements to ensure effective combustion and gas recirculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional valve designs are used in constant-volume combustion chambers, then the device complexity is reduced, but the tightness and robustness deteriorate during high pressurization
Solution Approach 1:
The patent employs spherical plugs instead of conventional linear valve designs. The spherical geometry provides superior tightness during high pressurization phases of the Humphrey cycle, as the spherical shape naturally distributes pressure more evenly and maintains sealing contact under extreme conditions, directly resolving the contradiction between reliability and complexity.
Solution Approach 2:
The spherical plugs are designed to rotate dynamically during operation, transitioning between open and closed positions to control gas flow through the combustion chamber. This dynamic rotation mechanism enables the valves to adapt to different phases of the combustion cycle while maintaining robust sealing, thereby improving reliability without excessive complexity.
2Reliability
If spherical plug valves are implemented, then the tightness and robustness improve, but the device complexity increases
Solution Approach 1:
The spherical plug design with integrated gas passage creates a compact, self-contained valve mechanism. The spherical geometry inherently provides structural strength and durability, extending service life while the integrated passage design minimizes the number of separate components, thereby limiting the increase in overall device complexity.
Solution Approach 2:
The spherical plug serves multiple functions simultaneously: it acts as a sealing element, a flow control mechanism, and a structural component. The single spherical body incorporates both the sealing surface and the internal gas passage, eliminating the need for separate sealing rings and passage components, thus improving service life without proportionally increasing complexity.
3Productivity
If spherical plug valves rotate in coordinated manner, then the consumption efficiency improves by 10-15%, but the ease of operation decreases
Solution Approach 1:
The patent combines the control mechanisms for multiple spherical plugs into a single coordinated rotation system. By linking the rotation of several spherical plugs together, the system achieves efficient control of gas flow through the combustion chamber, improving consumption efficiency while reducing the number of independent control actions required, thereby partially offsetting the operational complexity.
Solution Approach 2:
The spherical plugs rotate in a periodic manner synchronized with the phases of the Humphrey cycle (intake, combustion, exhaust). This periodic rotation optimizes gas flow timing and efficiency, achieving the reported 10-15% improvement in consumption efficiency. The regular, predictable nature of the periodic action simplifies control compared to arbitrary valve timing, mitigating some of the operational complexity.
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 solution results in a 10-15% gain in consumption efficiency and improved service life, with enhanced combustion performance and tightness, allowing for reliable operation of the combustion chamber.
Implementation Method 1
The invention operates advantageously according to a reliable principle based on mere rotation of the spherical plug, preferably always in the same direction, and preferably at a constant speed. This mere rotation makes it possible to alternately allow and block the flow of gas through the valve
Implementation Method 2
the design of the intake and exhaust valves has proved to be perfectible, particularly in terms of robustness and tightness, the latter potentially being problematic particularly during the high pressurisation observed during the combustion phase
Implementation Method 3
the spherical plug of the exhaust valve has a gas passage, and said chamber is designed so as to enable, after a gas exhaust phase resulting in the closure of the exhaust valve, recirculation of the combusted gases trapped in said gas passage
Data Source
AI summary
A constant-volume combustion chamber for an aircraft turbine engine, including a compressed gas intake valve configured to adopt an open position and a closed position, and in the closed position blocking intake of compressed gas into the chamber, and a combusted gas exhaust valve configured to adopt a closed position, in the closed position blocking exhaust of combusted gas outside the chamber. At least one of the intake and exhaust valves includes at least one spherical plug.