Rotary Engine Pilot Subchamber for Combustion Stability
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Solution Overview
Problem
Existing rotary engines, such as Wankel engines, are not optimized in terms of combustion arrangements and characteristics, leading to suboptimal performance.
Innovation Solution
A non-Wankel rotary engine design featuring a heat-resistant insert with a subchamber for pilot fuel injection and ignition, along with a main fuel injector, to enhance combustion efficiency by creating a stable ignition zone and improving fuel distribution within rotating chambers of variable volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional Wankel engine design is used, then the engine structure is simple, but the combustion characteristics are suboptimal and performance is reduced
Solution Approach 1:
The combustion system is segmented into two distinct injection systems: a pilot fuel injection system that injects fuel directly into the combustion chamber to create a stable ignition zone, and a main fuel injection system that injects the bulk fuel. This segmentation allows optimized combustion characteristics for heavy fuels while maintaining a manageable structural complexity through modular design.
2Use of energy by moving object
If heavy fuels are used in rotary engines, then energy density is improved, but combustion stability deteriorates due to poor ignition characteristics
Solution Approach 1:
The pilot fuel injection system performs preliminary action by injecting a small amount of easily ignitable fuel into the combustion chamber before the main fuel injection. This creates a stable ignition zone and preliminary combustion that reliably ignites the heavy main fuel, ensuring consistent combustion stability while maintaining the high energy density benefits of heavy fuels.
3Productivity
If fuel injection is optimized for heavy fuels, then combustion efficiency is improved, but the system complexity increases
Solution Approach 1:
The injection system implements local quality by providing different injection characteristics in different locations: the pilot fuel injector is positioned to create a concentrated ignition zone near the combustion chamber center, while the main fuel injector distributes fuel more broadly. Each injector is optimized for its specific function, achieving high combustion efficiency for heavy fuels while keeping the overall system complexity manageable through specialized localized design.
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 design improves combustion stability and efficiency by providing a hot ignition zone and optimized fuel injection, particularly beneficial for rotary engines using heavy fuels, and is applicable to various rotary engine types beyond Wankel engines.
Implementation Method 1
an insert in the peripheral wall of the outer body, the insert being made of a material having a greater heat resistance than that of the peripheral wall, the insert having a subchamber defined therein
Implementation Method 2
a pilot fuel injector having a tip received in the subchamber
Implementation Method 3
an ignition element having a tip received in the subchamber
Implementation Method 4
having a shape forming a reduced cross-section adjacent the opening
Data Source
AI summary
A non-Wankel rotary engine having an insert in the peripheral wall of the outer body, the insert being made of a material having a greater heat resistance than that of the peripheral wall, having a subchamber defined therein and having an inner surface bordering the cavity, the subchamber communicating with the cavity through at least one opening defined in the inner surface and having a shape forming a reduced cross-section adjacent the opening, a pilot fuel injector having a tip received in the subchamber, an ignition element having a tip received in the subchamber, and a main fuel injector extending through the housing and having a tip communicating with the cavity at a location spaced apart from the insert.