Turbine Engine Gearbox Lubrication With Power-Based Flow Modulation
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Solution Overview
Problem
Existing turbine engine lubrication systems are not optimized for varying power conditions, leading to inefficient lubricant usage that reduces gearbox efficiency during low-power and mid-power operations while increasing the risk of damage to gears and bearings.
Innovation Solution
A lubrication system with a proportional modulating valve and shut-off valve that dynamically adjusts lubricant flow based on turbine engine conditions, ensuring optimal lubrication during all power levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed lubrication system is used for the gearbox assembly, then the lubrication is sufficient during high-power operations, but the gearbox efficiency decreases during low-power and mid-power operations due to excessive lubricant flow
Solution Approach 1:
The lubrication system incorporates a modulating valve that dynamically adjusts the lubricant flow rate based on real-time monitoring of gearbox power level, thereby optimizing lubrication efficiency across varying operational conditions and preventing energy loss during low-power operations while maintaining adequate lubrication during high-power operations
Solution Approach 2:
The system employs sensors to monitor gearbox power level and feeds this information back to a controller, which then adjusts the modulating valve position to regulate lubricant flow rate, creating a closed-loop control system that adapts lubrication delivery to actual operational demands
2Reliability
If a fixed lubrication system is used for the gearbox assembly, then the lubrication is adequate during high-power operations, but the risk of damage to gears and bearings increases during low-power and mid-power operations due to insufficient lubricant flow
Solution Approach 1:
The lubrication system incorporates a modulating valve that dynamically adjusts the lubricant flow rate based on real-time monitoring of gearbox power level, thereby optimizing lubrication efficiency across varying operational conditions and preventing energy loss during low-power operations while maintaining adequate lubrication during high-power operations
Solution Approach 2:
The system employs sensors to monitor gearbox power level and feeds this information back to a controller, which then adjusts the modulating valve position to regulate lubricant flow rate, creating a closed-loop control system that adapts lubrication delivery to actual operational demands
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
Enhances gearbox efficiency by optimizing lubricant flow, reducing damage to gears and bearings, and maintaining performance across different power conditions.
Implementation Method 1
a modulating valve in fluid communication with the lubricant supply lines and the gearbox assembly for dynamically adjusting a flow rate of the lubricant to the gearbox assembly based on a monitored power level
Implementation Method 2
a sensor configured to monitor a power level of the gearbox assembly
Implementation Method 3
a controller in communication with the sensor and in communication with the modulating valve to adjust the flow rate of the lubricant to a target flow rate corresponding to the monitored power level
Data Source
AI summary
A turbine engine including a turbo-engine, a gearbox assembly, a propulsor, and a lubrication system. The turbo-engine includes a compressor section, a combustor, a turbine section, and an input shaft. The gearbox assembly includes a first gear, a plurality of second gears, and a third gear. The propulsor has an output shaft drivingly coupled to the input shaft through the gear assembly. The lubrication system is characterized by a Gearbox Lubrication System Parameter (GLSP) between 0.2 and 140 when a mass flow rate of the lubricant is linear with a lubricant pump speed, where the GLSP is given by:(1-ηDP)NDP3×VGBX×NS×αdTOCdTDP×PDPPOC×(NDPNOC)2×108.The GLSP is between 0.2 and 70 when the mass flow rate of the lubricant is modulated, where the GLSP is given by:(1-ηDP)NDP3×VGBX×NS×αdTOCdTDP×PDPPOC×(NDPNOC)2×108.