Rotary Piston Engine Intake Air Cooling Segmentation
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Solution Overview
Problem
Rotary internal combustion engines with intake air internal cooling face limitations in maximum power and durability due to heated intake air reducing air density, turbulence, and limited cooling capacity, which are exacerbated by throttle-dependent air availability and insufficient cooling at full load and rapid load changes.
Innovation Solution
Repositioning the throttle and pressure relief valve from the inlet manifold to the connection to the working area allows for unrestricted air flow for cooling, enabling the use of over-dimensioned chargers and additional cooling measures like charge air coolers, and directing pressure relief valve air for enhanced component cooling and exhaust gas temperature reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If intake air is used for internal cooling before entering the working area, then internal component cooling is improved, but air density decreases due to heating
Solution Approach 1:
The air flow path is segmented into two separate paths: one path directs air through the working area for internal cooling of components, while another path directs air directly to the inlet manifold for combustion. This segmentation allows the cooling function and combustion function to operate independently without compromising air density for combustion.
Solution Approach 2:
A separate air passage acts as an intermediary pathway that bypasses the working area, allowing fresh air to reach the inlet manifold directly without being heated by internal components. This intermediary path resolves the conflict between cooling requirements and maintaining air density.
2Temperature
If air is guided through the rotor and eccentric shaft for cooling, then internal component cooling is improved, but air flow turbulence increases
Solution Approach 1:
The air flow system is segmented into distinct channels: a cooling channel that directs air through the rotor and eccentric shaft for component cooling, and a separate combustion channel that directs air to the inlet manifold. This segmentation isolates the turbulent cooling flow from the combustion air flow, preventing turbulence from affecting combustion performance.
3Temperature
If the same air is used for both cooling and combustion, then cooling capacity is improved, but maximum power decreases due to limited air availability
Solution Approach 1:
The air supply system is segmented into two independent flow paths originating from the charger: one path directs air through the working area for internal cooling, while the other path directs air to the inlet manifold for combustion. This segmentation doubles the air utilization efficiency without compromising maximum power output.
Solution Approach 2:
The charger is designed to supply air for multiple functions simultaneously: it charges air for combustion in the inlet manifold and also provides cooling air for internal components through the working area. This multi-functionality resolves the limitation of air availability for both cooling and power generation.
4Ease of operation
If throttle and pressure relief valve are positioned at the inlet manifold, then throttle control is simplified, but cooling air availability becomes throttle-dependent
Solution Approach 1:
The throttle control system is segmented into two independent control points: one throttle controls air flow to the inlet manifold for combustion, while another throttle controls air flow through the working area for cooling. This segmentation allows independent optimization of both combustion control and cooling air availability.
Solution Approach 2:
A separate air passage with its own throttle acts as an intermediary control system for cooling air flow, independent of the main inlet manifold throttle. This intermediary control allows cooling air availability to be decoupled from the combustion throttle position.
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 configuration enhances internal component cooling, increases maximum power, and improves engine durability by decoupling cooling air from throttle position, allowing for more efficient air utilization and reduced exhaust gas temperatures.
Implementation Method 1
the intake air is first aspirated through an inlet manifold and then guided through a port in one side plate, from where it flows to the eccentric shaft and the inner area of the rotor
Implementation Method 2
a charge air cooler can be used, as is disclosed in the document DE2234698A
Data Source
AI summary
The invention relates to a charged rotary internal combustion engine with intake air internal cooling (EM), characterized in that in the connection between components to be cooled and the inlet into the working area at least one shut-off device (V) is provided, through which charging pressure can escape.