Geared Turbofan Gearbox Rating for Speed Ratio Optimization
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Solution Overview
Problem
Geared turbofan engines face increased complexity during development and manufacturing due to the inclusion of a gearbox, necessitating improved methods and devices for more efficient and precise development and manufacturing.
Innovation Solution
A gearbox efficiency rating (GER) is introduced, defined as Q(D1.56T)1.53, where Q is the gearbox oil flow rate, D is the fan blade diameter, and T is the net thrust, aiding in the development and simplifying the gearbox design in turbomachine engines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a gearbox is included in a turbofan engine to allow power turbine and bypass fan to operate at different rotational speeds for maximum efficiency, then engine efficiency and power production are improved, but device complexity and manufacturing difficulty increase significantly
Solution Approach 1:
The patent introduces a gearbox efficiency rating parameter that combines multiple engine parameters (oil flow rate, fan diameter, net thrust) into a single standardized metric. This parameter change enables systematic optimization of gearbox design and selection, allowing engineers to achieve maximum efficiency without proportionally increasing complexity by providing clear guidance for gearbox configuration decisions.
2Power
If a gearbox is included in a turbofan engine to allow power turbine and bypass fan to operate at different rotational speeds, then power production is improved, but manufacturing difficulty increases significantly
Solution Approach 1:
The gearbox efficiency rating provides a standardized parameter that simplifies the manufacturing selection process. By expressing gearbox performance in terms of a single rating derived from standard engine parameters, the patent makes it easier to select and manufacture appropriate gearboxes without requiring complex custom designs for each engine configuration.
3Adaptability or versatility
If a gearbox is included in a turbofan engine, then operational flexibility is improved, but development difficulty increases significantly
Solution Approach 1:
The patent creates a standardized efficiency rating parameter that simplifies the development process for geared turbofan engines. This single metric allows developers to systematically evaluate and optimize gearbox configurations for different operational requirements, reducing development difficulty while maintaining operational flexibility through data-driven design decisions.
Data Source
AI summary
A turbomachine engine can include a fan assembly, a vane assembly, a core engine, and a gearbox. The fan assembly can include a plurality of fan blades. The vane assembly can include a plurality of vanes, and the vanes can be disposed aft of the fan blades. The core engine can include one or more compressor sections and one or more turbine sections. The gearbox includes an input and an output arranged in a planet configuration. The input is coupled to the one or more turbine sections of the core engine and comprises a first rotational speed, the output is coupled to the fan assembly and has a second rotational speed. A gear ratio of the first rotational speed to the second rotational speed is within a range of 4.1-14.0.