Curved Suction Duct Insert for Intake Noise and Vortex Reduction
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Solution Overview
Problem
Air recirculation systems, such as those in aircraft, face significant noise issues due to high air velocity, vorticities, and cross-flow interactions at suction duct intakes, which are challenging to address due to cost, space, and certification constraints.
Innovation Solution
An insert for air intakes of suction ducts is designed with a curved conduit having non-parallel inlet and outlet ends, a sealing mating portion, and an outer portion with a curved lip to reduce vorticities and noise, featuring a jagged trailing edge and varying cross-sectional dimensions to align airflow with the duct flow direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional suction duct intakes are used, then the system is simple and cost-effective, but noise levels are high due to vorticities and cross-flow interactions
Solution Approach 1:
The suction duct intake is divided into multiple separate inserts, each with its own curved conduit. This segmentation allows each insert to independently manage and redirect airflow, reducing overall noise while maintaining system simplicity through modular installation
Solution Approach 2:
The curved conduit acts as an intermediary element between the external airflow and the suction duct interior. It mediates the airflow transition by gradually redirecting it, preventing direct impingement and reducing vorticities and noise without requiring complete system redesign
2Object-affected harmful factors
If airflow is not redirected, then the system is simple, but vorticities and cross-flow interactions increase noise
Solution Approach 1:
The conduit is designed with a curved geometry that gradually redirects airflow from its initial direction to align with the suction duct flow. This curvature eliminates sharp transitions that would generate vorticities, smoothly guiding air through the insert while reducing harmful flow interactions
3Ease of operation
If the outlet end has the same cross-sectional area as the suction duct, then installation is simpler, but airflow alignment with duct flow is insufficient
Solution Approach 1:
The outlet end of the conduit is designed with a reduced cross-sectional area compared to the suction duct. This parameter change creates a controlled flow contraction that enhances airflow alignment with the duct flow direction, reducing cross-flow interactions and improving overall flow efficiency
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 insert significantly reduces noise by up to 80% by guiding airflow to align with the duct flow, balancing mass flow distribution and minimizing vortices, while being cost-effective and compatible with existing systems.
Implementation Method 1
the conduit being curved so that the inlet and outlet directions are non-parallel
Implementation Method 2
the lip is configured to reduce vorticities in an airflow entering the conduit through the inlet
Implementation Method 3
The insert significantly reduces noise by up to 80% by guiding airflow to align with the duct flow, balancing mass flow distribution and minimizing vortices
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
An insert for an air intake of a suction duct, the insert including an inner portion configured to extend within the suction duct, a mating portion configured for sealingly engaging the air intake, and an outer portion configured for extending outside of the suction duct. The inner portion includes a conduit having a central axis extending along an inlet direction at the inlet end and along an outlet direction at the outlet end, the inlet and outlet directions being non-parallel. The outlet end has a smaller cross-sectional area than that of the suction duct. The insert includes an inlet in fluid communication with the inlet end of the conduit. The outer portion includes a curved lip surrounding at least part of an inlet opening of the inlet, the lip configured to direct a flow into the inlet opening and toward the inlet end of the conduit.