High Curvature Hub Inlet Particle Separator
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Solution Overview
Problem
Conventional inlet particle separators have low efficiency in separating small particles (<80 microns) from engine inlet air, leading to potential engine performance degradation due to particle ingestion, despite high efficiency for larger particles.
Innovation Solution
The inlet particle separator system features a hub section with a diverging outer surface, a shroud section with a surrounding inner surface, and a splitter that divides the flow path, creating a throat section upstream of the hub apex with high curvature, which increases the separation efficiency of small particles while maintaining minimal core pressure loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional inlet particle separator configuration is used, then large particles (>80 microns) are effectively separated, but small particles (<80 microns) pass through to the engine
Solution Approach 1:
The patent applies high curvature surfaces at the hub apex region to enhance small particle separation. The curved surface geometry creates specific flow patterns that increase particle impingement on the hub surface, effectively separating sub-80 micron particles that conventional flat or low-curvature designs cannot capture.
Solution Approach 2:
The patent modifies geometric parameters of the inlet separator, specifically the hub curvature radius and apex location, to optimize separation performance. By adjusting these parameters, the system achieves enhanced small particle separation while maintaining acceptable pressure loss characteristics.
2Manufacturing precision
If the inlet particle separator is designed to improve small particle separation, then separation efficiency increases, but core pressure loss increases
Solution Approach 1:
The patent applies high curvature surfaces locally at the hub apex region rather than throughout the entire inlet separator. This localized approach concentrates the separation effect where it is most needed for small particles while minimizing the overall impact on flow resistance and pressure loss.
Solution Approach 2:
The patent uses a moderate curvature radius that provides sufficient separation effect without creating excessive flow resistance. The curvature is optimized to achieve the necessary separation performance while maintaining acceptable pressure loss, avoiding both insufficient curvature and excessive curvature extremes.
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 configuration effectively increases the separation efficiency of small particles from engine inlet air without significantly increasing core pressure loss, preventing engine performance degradation by directing small particles away from the engine flow path.
Implementation Method 1
The hub section and the shroud section are configured such that the cross sectional flow area of the main flow passageway decreases downstream of the air inlet to define a throat section, and the throat section is disposed upstream of the hub apex
Implementation Method 2
The inertia of relatively larger ones of the suspended particles tends to cause these particles to travel in a straight line rather than follow the fluid passageway
Data Source
AI summary
An inlet particle separator system for a vehicle engine includes a hub section, a shroud section, and a splitter. The hub section has a hub outer surface that diverges, relative to the axis of symmetry, to a hub apex. The shroud section has a shroud inner surface that surrounds, and is spaced apart from, at least a portion of the hub section to define a main flow passageway between the hub outer surface and the shroud inner surface. The splitter is disposed downstream of the air inlet and extends into the main flow passageway to divide the main flow passageway into a scavenge flow path and an engine flow path. The hub section and the shroud section are configured such that the cross sectional flow area of the main flow passageway decreases downstream of the air inlet to define a throat section that is disposed upstream of the hub apex.