Opposed-Piston Intake Chamber Air Diffusing Feature
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Solution Overview
Problem
Uniflow-scavenged, two-stroke opposed-piston engines face challenges in ensuring uniform airflow distribution to cylinders, leading to inconsistent scavenging efficiency due to the absence of an intake manifold, which results in reduced engine performance.
Innovation Solution
An airflow diffusing structure within the open air intake chamber, featuring varying apertures along its length, is introduced to evenly distribute charge air to all cylinders, ensuring each intake port receives a similar amount of air, thereby optimizing scavenging efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If an open air intake chamber is used without an intake manifold, then engine weight and parts complexity are reduced, but uniform airflow distribution to cylinders is compromised
Solution Approach 1:
The diffuser structure implements local quality by varying the aperture dimensions at different locations along the intake chamber. The apertures are designed with different sizes and shapes at various positions to compensate for the natural airflow variation from the inlet, ensuring that each cylinder receives uniform charge air despite the simplified open chamber configuration.
Solution Approach 2:
The invention applies parameter changes by modifying the geometric parameters of the apertures in the diffuser structure. The aperture dimensions (area, shape, orientation) are systematically varied along the length of the intake chamber to control and equalize airflow distribution, transforming the simple open chamber into an optimized airflow distribution system.
2Weight of moving object
If an open air intake chamber is used without an intake manifold, then engine weight is reduced, but uniform airflow distribution to cylinders is compromised
Solution Approach 1:
The diffuser structure implements local quality by varying the aperture dimensions at different locations along the intake chamber. The apertures are designed with different sizes and shapes at various positions to compensate for the natural airflow variation from the inlet, ensuring that each cylinder receives uniform charge air despite the simplified open chamber configuration.
Solution Approach 2:
The invention applies parameter changes by modifying the geometric parameters of the apertures in the diffuser structure. The aperture dimensions (area, shape, orientation) are systematically varied along the length of the intake chamber to control and equalize airflow distribution, transforming the simple open chamber into an optimized airflow distribution system.
3Device complexity
If charge air flows directly into cylinders without diffusion, then airflow path is simplified, but scavenging efficiency becomes inconsistent across cylinders
Solution Approach 1:
The diffuser structure implements local quality by varying the aperture dimensions at different locations along the intake chamber. The apertures are designed with different sizes and shapes at various positions to compensate for the natural airflow variation from the inlet, ensuring that each cylinder receives uniform charge air despite the simplified open chamber configuration.
Solution Approach 2:
The diffuser structure performs preliminary action by pre-distributing and equalizing the airflow to each cylinder before the charge air enters the combustion chamber. This preliminary distribution ensures that each cylinder receives the appropriate amount of air for effective scavenging, preventing inconsistent scavenging 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 airflow diffusing structure effectively equalizes airflow to each cylinder, enhancing scavenging efficiency and maintaining the benefits of an open intake chamber configuration while reducing engine weight and parts complexity.
Implementation Method 1
The diffusing structure causes airflow entering into the chamber to undergo diffusion so as to spread out evenly across the chamber such that all intake port openings downstream of the diffusing structure receive substantially equal amounts of fresh charge air mass.
Data Source
AI summary
An air intake system is provided that supplies charge air to multiple cylinders in an in-line configuration in an uniflow-scavenged, two-stroke opposed-piston engine. The engine is configured such that the intake ports of the cylinders are situated in one intake chamber within the engine block. The air intake chamber includes a feature to balance the mass of air that reaches the intake port of each cylinder in the engine.