Inlet Particle Separator Hub Suction Flow Passage
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Solution Overview
Problem
Conventional inlet particle separators for aeronautical vehicle engines are inefficient in separating small particles (<80 microns) from engine inlet air, leading to potential engine performance degradation due to particle ingestion, without significantly increasing core pressure loss.
Innovation Solution
The proposed inlet particle separator system incorporates a hub section, shroud section, and splitter with hub or shroud suction flow passages to enhance separation efficiency by directing small particles into a scavenge flow path, utilizing a configuration that includes a main flow passageway with an air inlet and a splitter to divide the flow into engine and scavenge paths, and optionally features hub or shroud suction flow passages with inlet and outlet ports to further separate particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional inlet particle separator is used, then large particles (>80 microns) are separated efficiently, but small particles (<80 microns) are not separated effectively
Solution Approach 1:
The separator is divided into multiple functional zones: a primary separation zone for large particles and a secondary hub suction zone for small particles. The splitter divides the flow path into engine flow and scavenge flow, while the hub suction flow passage creates a separate suction zone to capture fine particles that would otherwise escape through the engine inlet.
Solution Approach 2:
The hub suction flow passage acts as an intermediary mechanism between the main flow and the scavenge system. It creates a secondary suction path that intercepts small particles before they reach the engine inlet, using a hub suction inlet port and outlet port configuration to draw fine particles into the scavenge flow path for removal.
2Manufacturing precision
If particle separation efficiency is increased, then more particles are removed from air, but core pressure loss increases
Solution Approach 1:
The separator applies different flow control characteristics to different zones: the main flow passageway maintains smooth flow for engine air, while the hub suction flow passage creates localized suction zones to capture particles. The splitter geometry is optimized to direct particle-laden flow to the scavenge path while maintaining efficient engine air flow through the hub and shroud sections.
Solution Approach 2:
The system changes flow parameters locally by creating suction zones through the hub suction inlet port and shroud suction inlet port. These suction ports create pressure differentials that enhance particle capture without requiring a complete redesign of the main flow path, thereby improving separation efficiency while minimizing overall pressure loss.
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 increases the separation efficiency of small particles from engine inlet air without significantly increasing core pressure loss, ensuring cleaner air is directed into the engine and reducing the risk of engine performance degradation.
Implementation Method 1
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. Because of the manner in which the inlet particle separator is configured, most of the suspended particles tend to flow into the scavenge flow path rather curve into the engine flow path.
Implementation Method 2
The hub suction flow passage has a hub suction inlet port and a hub suction outlet port. The hub suction inlet port extends through the hub section and is in fluid communication with the air inlet. The hub suction outlet port extends through the splitter and is in fluid communication with the scavenge flow path.
Data Source
AI summary
An inlet particle separator system for a vehicle engine includes a hub section, a shroud section, a splitter, and a hub suction flow passage. The shroud section surrounds at least a portion of the hub section and is spaced apart therefrom to define a main flow passageway that has an air inlet. The splitter is disposed downstream of the air inlet and extends into the passageway to divide the main flow passageway into a scavenge flow path and an engine flow path. The hub suction flow passage has a hub suction inlet port and a hub suction outlet port. The hub suction inlet port extends through the hub section and is in fluid communication with the air inlet. The hub suction outlet port extends through the splitter and is in fluid communication with the scavenge flow path.