Accessory Gearbox Segmentation for Turbine Engine Drag and Access
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Solution Overview
Problem
Existing accessory gearboxes in gas turbine engines face challenges in providing efficient power distribution to various accessory systems while maintaining aerodynamic efficiency and accessibility, particularly in compact engine designs.
Innovation Solution
A core-mounted accessory gearbox with a first portion within the inner cowl straddling the engine core and a second portion extending between the inner and outer cowls, allowing for aerodynamic fairing and improved accessibility by positioning components in the bifurcated airflow, enabling easier access and reduced drag.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the accessory gearbox is positioned within the inner cowl straddling the engine core, then accessibility for maintenance is improved, but aerodynamic drag increases
Solution Approach 1:
The accessory gearbox is divided into two distinct portions: a first portion located within the inner cowl for maintenance accessibility, and a second portion extending between the inner and outer cowls for aerodynamic integration. This segmentation allows each portion to optimize its location for its primary function.
Solution Approach 2:
Different portions of the accessory gearbox are positioned in different locations with different aerodynamic characteristics. The first portion within the inner cowl prioritizes accessibility, while the second portion in the bifurcated airflow prioritizes aerodynamic efficiency, allowing each local region to serve its optimal purpose.
2Loss of energy
If the accessory gearbox components extend into the bifurcated airflow between inner and outer cowls, then aerodynamic efficiency is improved, but device complexity increases
Solution Approach 1:
The accessory gearbox structure serves multiple functions simultaneously: it provides power distribution to accessory systems, maintains aerodynamic efficiency by extending into the bifurcated airflow, and ensures maintenance accessibility through its strategic positioning. This multi-functionality reduces the need for separate components for each purpose.
3Volume of moving object
If the accessory gearbox is designed for compact engine configurations, then engine size is reduced, but power distribution capability to accessory systems is limited
Solution Approach 1:
The accessory gearbox utilizes the radial dimension by extending between the inner and outer cowls, allowing power distribution to accessory systems located at different radial positions without increasing the axial length of the engine. This dimensional approach maintains compact engine size while preserving power distribution capability.
Data Source
AI summary
A turbine engine that includes an engine core, an inner cowl, an outer cowl and an accessory gearbox. The engine core includes at least a compressor section, a combustion section, and a turbine section in axial flow arrangement. The accessory gearbox is operably coupled to the engine core and includes a first portion and a second portion.