Vessel Air Intake System Routing to Prevent Engine Heat
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Solution Overview
Problem
In small-sized vessels, the air intake system exposes outside air to hot air generated by the engine, leading to increased intake air temperature and reduced engine output.
Innovation Solution
The implementation of an air intake box, air intake duct, and guide duct system that directs outside air to the engine without exposure to hot air, using a connector duct and heat shield to maintain air temperature, and incorporating a flange and heat insulator to further reduce intake air temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the air intake duct is disposed in the inboard space with the inner end at a forward position, then the air intake structure is simplified, but the intake air temperature increases due to exposure to hot air generated by the engine
Solution Approach 1:
The air intake duct is divided into multiple sections: a first air intake duct extending from the deck to a first position, and a second air intake duct extending from the first position to the engine air intake port. This segmentation allows the duct to bypass the hot air generation area, preventing thermal exposure while maintaining structural simplicity
Solution Approach 2:
A heat shield is introduced as an intermediary component between the engine and the air intake duct. The heat shield blocks thermal radiation and hot air flow from the engine, creating a thermal barrier that protects the intake air from temperature increase
2Length of moving object
If the air intake duct passes through the inboard space near the engine, then the duct length is reduced, but the engine output decreases due to warmed intake air
Solution Approach 1:
The air intake duct is routed through the deck and along the outer surface of the vessel body rather than through the internal inboard space. This three-dimensional routing change allows the duct to be sufficiently long to avoid hot zones while maintaining a compact overall structure, preventing thermal exposure that would reduce engine power
3Temperature
If heat insulation measures are added to the air intake duct, then the intake air temperature is maintained, but the device complexity and manufacturing cost increase
Solution Approach 1:
The air intake path is extracted from the hot air generation zone by routing the duct through the deck and along the vessel's outer surface. This spatial extraction eliminates the need for complex active heat insulation systems, maintaining intake air temperature through passive geometric design
Solution Approach 2:
The vessel's outer surface and deck structure are utilized as natural thermal barriers and routing paths. The external environment acts as a cooling medium, and the structural components serve dual purposes as both vessel framework and thermal protection for the air intake system
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 solution effectively prevents the increase in intake air temperature, thereby maintaining engine output and propulsive force in jet propulsion watercraft.
Implementation Method 1
The guide duct includes an opening that opposes the air intake port, and guides air taken in from outside the vessel body by the air intake duct to the opening
Implementation Method 2
incorporating a flange and heat insulator to further reduce intake air temperature
Data Source
AI summary
A vessel includes a vessel body, an engine contained in the vessel body, an air intake box including an air intake port and that is attached to the engine, an air intake duct drawn around in the vessel body, and a guide duct including an opening that opposes the air intake port. The air intake box supplies air taken in from the air intake port to the engine. The air intake duct includes an outer end connected to a deck of the vessel body. The guide duct guides air taken in from outside the vessel body by the air intake duct to the opening.