Compressor Inlet Duct Contoured Floor for Airflow Velocity
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Solution Overview
Problem
Existing inlet ducts for compressors and superchargers do not effectively manage airflow to maximize volumetric efficiency and performance, particularly due to turbulence caused by mismatched shapes between the duct and housing, and lack of optimized velocity components for rotor interaction.
Innovation Solution
A C-shaped inlet duct with contoured inner walls and ridges that complement the tangential velocity of counter-rotating rotors, ensuring smooth airflow and reducing turbulence by matching the outlet shape with the housing inlet, and incorporating adjustable ridges to enhance airflow velocity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional inlet duct with straight walls is used, then the duct structure is simple, but turbulence occurs due to shape mismatch with the housing inlet opening
Solution Approach 1:
The inlet duct employs contoured curved surfaces instead of straight walls, with the inner wall featuring a contoured floor portion and contoured sidewall portions that guide airflow smoothly into the C-shaped inlet opening of the housing, eliminating turbulence caused by shape mismatch
Solution Approach 2:
The inlet duct incorporates contoured sections at specific locations where airflow transition is needed, particularly at the outlet end where the duct connects to the housing, while maintaining simpler geometry in other sections to balance manufacturing ease with airflow optimization
2Device complexity
If a conventional inlet duct without velocity optimization is used, then the duct design is simple, but volumetric efficiency is not maximized due to lack of complementary velocity components
Solution Approach 1:
The inlet duct modifies the velocity parameters of incoming airflow by incorporating contoured surfaces that accelerate and direct air at specific angles, creating velocity components that complement the tangential velocity of the counter-rotating rotors, thereby maximizing volumetric efficiency
Solution Approach 2:
The inlet duct pre-conditiones the airflow before it enters the compressor housing by shaping the velocity distribution and direction, ensuring that air arrives at the rotors with optimal velocity components that enhance compression efficiency
3Ease of manufacture
If the outlet opening shape does not match the housing inlet shape, then the duct is easier to manufacture, but airflow turbulence increases
Solution Approach 1:
The inlet duct outlet opening is designed with a C-shape that specifically matches the asymmetric geometry of the housing inlet opening, creating a complementary fit that guides airflow smoothly into the housing without turbulence, while the rest of the duct maintains a more conventional cylindrical form
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 enhances airflow management, reducing turbulence and maximizing volumetric efficiency, thereby improving the performance of internal combustion engines by ensuring complementary velocity components and balanced airflow distribution.
Implementation Method 1
At least a portion of the floor is contoured to impart a velocity component to the airflow complementary to the tangential velocity of each of the first and second rotors during rotation of the first and second rotors
Implementation Method 2
The first and second ridges preferably increase in at least one of height and width moving toward the outlet opening of the inlet duct. The first and second ridges are operable to impart a velocity component to the airflow complementary to the tangential velocity of each of the first and second rotors
Data Source
AI summary
An inlet for a compressor having a housing defining a generally C-shaped inlet opening and a rotor cavity configured to contain first and second rotors is provided. The inlet includes an inlet duct defining an inlet opening and a generally C-shaped outlet opening. The inlet duct has an inner wall defining a cavity operable to communicate airflow between the inlet opening and the generally C-shaped outlet opening. The generally C-shaped outlet opening of the inlet duct is substantially similar to the shape of the generally C-shaped inlet opening of the housing. The inner wall includes a floor portion and a roof portion. At least a portion of the floor portion is contoured to impart a velocity component to the airflow complementary to the tangential velocity of each of the first and second rotors during rotation of the first and second rotors.