Rotary Engine Parallel Cooling System
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Solution Overview
Problem
Existing cooling systems for rotary internal combustion engines, such as Wankel engines, require intricate sealing arrangements to prevent leakage, and they often suffer from inefficient heat dissipation due to coolant flow in series, which can lead to uneven cooling of engine components.
Innovation Solution
A rotary engine design featuring parallel coolant passages within the side housings, rotor housing, and intermediate housing, allowing each housing to be cooled independently without inter-passage connections, thereby eliminating the need for complex sealing arrangements and enabling more efficient heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If series coolant flow is used to cool the housings, then the cooling system is simpler, but heat dissipation efficiency deteriorates and uneven cooling occurs
Solution Approach 1:
The cooling system is segmented into multiple independent parallel coolant passages, with each passage dedicated to cooling a specific housing component (first side housing, second side housing, rotor housing). This segmentation allows each passage to independently cool its target area, preventing the uneven cooling and energy loss associated with series flow, while maintaining system simplicity through the modular parallel structure.
2Adaptability or versatility
If inter-passage connections are provided between housings for coolant flow, then the cooling system is more integrated, but sealing complexity increases and leakage risk worsens
Solution Approach 1:
The coolant passages are segmented into separate, non-interconnected channels within each housing. The first coolant passage is contained within the first side housing, the second within the second side housing, and the third within the rotor housing, with no inter-passage connections. This segmentation eliminates the need for complex sealing arrangements at housing interfaces, preventing leakage while maintaining cooling effectiveness.
3Device complexity
If parallel coolant passages are used with no inter-passage connection, then sealing requirements are simplified, but coolant distribution uniformity may worsen
Solution Approach 1:
Each coolant passage is designed with local quality optimization, where the passage geometry, cross-sectional area, and routing are specifically tailored to the thermal load characteristics of each housing component. The first passage is optimized for the first side housing, the second for the second side housing, and the third for the rotor housing, ensuring uniform and effective coolant distribution across each local area without requiring complex inter-passage connections.
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 parallel cooling system effectively cools each housing component independently, enhancing heat dissipation efficiency and simplifying the assembly process by eliminating the need for coolant seals at mounting interfaces.
Implementation Method 1
The parallel flow coolant circuit having first, second, and third coolant passages extending respectively through the first side housing, the second side housing, and the rotor housing
Implementation Method 2
a parallel flow coolant circuit operable to individually cool the first side housing, the second side housing, and the rotor housing
Data Source
AI summary
A rotary engine, has: housings secured to one another, the housings including a first side housing, a second side housing, and a rotor housing disposed between the first side housing and the second side housing; and a rotor rotationally received within a rotor cavity defined by the first side housing, the second side housing, and the rotor housing; wherein the first side housing, the rotor housing, and the second side housing are cooled in parallel via respective coolant passages including: a first side housing coolant passage extending through the first side housing; a second side housing coolant passage extending through the second side housing; and a rotor housing coolant passage extending through the rotor housing, and wherein the coolant passages are free of inter-passage connection between the housings.