Turbomachine Oil Recovery Gutter for Axial Evacuation and Anti-Backflow
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Solution Overview
Problem
Existing oil recovery gutters in turbomachines are prone to clogging, leading to oil backflow onto the reducer, which disrupts the dynamic behavior and efficiency of the reducer.
Innovation Solution
An oil recovery device with a gutter extending around an axis, featuring an oil reception chamber with a first wall and a second wall that increases radially towards an axial orifice, effectively converting radial ejection speed into axial speed and increasing pressure to efficiently evacuate oil, minimizing radial dimensions and preventing backflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If open gutters are used to guide ejected oil, then oil evacuation is facilitated, but the gutters become clogged with oil leading to backflow onto the reducer
Solution Approach 1:
The gutter is divided into multiple reception chambers separated by partition walls. Each chamber has its own axial evacuation orifice in the first wall, allowing segmented oil collection and evacuation. This segmentation prevents clogging from propagating across the entire gutter and enables localized cleaning of each chamber without affecting the whole system.
Solution Approach 2:
The invention transitions from radial oil collection to axial oil evacuation by creating chambers with axial evacuation orifices. The second wall's increasing radial dimension converts radial ejection speed into axial speed, directing oil flow axially through the orifices rather than radially, thereby preventing backflow onto the reducer.
2Productivity
If the second wall has increasing radial dimension towards the axial orifice, then oil is efficiently conveyed to the orifice, but the radial overall dimension of the device increases
Solution Approach 1:
The second wall is designed with a dynamic profile where the radial dimension increases progressively along the axis towards the axial orifice. This gradual increase optimizes the conversion of radial ejection speed into axial speed while minimizing the overall radial footprint. The dynamic geometry allows efficient oil conveyance without requiring excessive radial space.
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 solution significantly reduces oil returns to the reducer, unclogs the reception chamber, and enhances the dynamic behavior and efficiency of the reducer by ensuring efficient oil evacuation.
Implementation Method 1
the oil is generally injected into the reducer via various injectors, then ejected at the periphery of the ring gear under the effect of the centrifugal force
Implementation Method 2
the second wall produces a gradual increase in the oil pressure
Data Source
AI summary
An oil recovery device for a reducer of an aircraft turbomachine, the device having a gutter extending around an axis and being intended to be arranged facing oil ejection means formed in a ring gear of the reducer of the turbomachine. The gutter can include at least one oil reception chamber which extends around the axis and which is open towards the axis so as to receive the oil coming from the oil ejection means. The reception chamber can be delimited by a first wall and a second wall arranged facing each other. The first wall can have an axial oil evacuation orifice and the second wall can have a radial dimension relative to the axis which increases increasingly along the axis towards the axial orifice, so as to allow oil ejected by the reducer to be conveyed to the axial orifice.