Rotary Engine Rotor Cooling via Intake Spray Injection
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Solution Overview
Problem
Rotary combustion engines, such as Wankel engines, face overheating issues due to the rotor becoming too hot, leading to potential damage and failure, and existing multifuel engines are not adequately adapted to manage this problem effectively.
Innovation Solution
The implementation of an intake spray injector that sprays fuel at lower pressure onto the rotor in the intake chamber for evaporative cooling, combined with a supplemental air-fuel conduit delivering compressed air-fuel mixture to the ignition-combustion chamber, along with a shaped rotor pocket to enhance torque and power efficiency, utilizing a one-way check valve to prevent backflow and a thrust nozzle to direct combustion gases for rotor propulsion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If fuel is sprayed onto the rotor in the intake chamber for evaporative cooling, then the rotor temperature is reduced, but the fuel delivery system becomes more complex with multiple injectors and pressure requirements
Solution Approach 1:
The fuel delivery system is segmented into two separate injection systems: a low-pressure intake spray injector for evaporative cooling and a high-pressure ignition injector for combustion. This segmentation allows each injector to be optimized for its specific function while managing the overall system complexity through functional separation.
Solution Approach 2:
Different regions of the rotor surface receive different treatments: the intake spray injector targets specific areas for evaporative cooling, while the ignition injector delivers fuel to the combustion chamber. This local differentiation optimizes cooling efficiency and combustion performance in their respective zones.
2Productivity
If a supplemental air-fuel conduit is added to deliver compressed air-fuel mixture to the ignition-combustion chamber, then combustion efficiency is improved, but the device complexity increases
Solution Approach 1:
The supplemental air-fuel conduit merges the compressed air-fuel mixture from the compression chamber with the ignition injector delivery system. This merging allows the two fuel delivery paths to converge at the ignition-combustion chamber, improving combustion efficiency while consolidating the system architecture.
Solution Approach 2:
The supplemental air-fuel conduit serves multiple functions: it delivers compressed air-fuel mixture to the ignition chamber, supports multifuel capability, and enhances torque production. This multi-functionality justifies the added complexity by delivering diverse benefits through a single structural addition.
3Reliability
If a one-way check valve is installed to prevent backflow of combusting gases, then engine reliability is improved, but the device complexity increases
Solution Approach 1:
The one-way check valve acts as an intermediary component between the compression chamber and the supplemental air-fuel conduit. It mediates the flow of compressed air-fuel mixture while blocking the backflow of combusting gases, thereby protecting the compression chamber without requiring complex active control systems.
4Power
If the rotor pocket is shaped to create thrust from combusting gases, then torque and power output are enhanced, but the manufacturing precision requirements increase
Solution Approach 1:
The rotor pocket is shaped with specific curvature characteristics to optimize the flow path of combusting gases. The curved geometry naturally directs the high-pressure gases to generate thrust in the direction of rotor rotation, converting combustion energy into mechanical work while accommodating manufacturing tolerances through smooth transitional surfaces.
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 effectively cools the rotor through evaporative cooling, prevents overheating, and enhances engine efficiency by managing combustion forces to improve torque and power output, while being adaptable to various fuel types and reducing the risk of engine damage.
Implementation Method 1
The introduction of liquid fuel into the intake chamber and particularly delivered to the surface of the rotor may effectively cool the rotor through evaporative cooling
Implementation Method 2
a supplemental air-fuel conduit that extends from the compression chamber to the ignition-combustion chamber to deliver compressed air-fuel mixture
Implementation Method 3
A one-way check valve may prevent any combusting gases from flowing back into and through the supplemental air-fuel conduit to the compression chamber
Implementation Method 4
The rotor pocket may be shaped in a fashion that creates a thrust from combusting gasses that helps drive the rotor in the direction of rotation
Data Source
AI summary
A rotary engine has a rotor with a rotor pocket for receiving air-fuel mixture that is combusted therein to propel the rotor within the housing. The rotary engine may have one or more intake spray injectors that spray fuel into the rotor pocket and onto the rotor face within the intake chamber to effectively cool the rotor pocket and rotor face. An air channel extension of the rotor pocket may be configured in the housing and/or in the rotor to extend from the compression chamber into the ignition-combustion chamber to relieve some pressure in the trailing compression chamber of a rotor face to minimize negative work. A supplemental air-fuel conduit may be configured to supply high-pressure gas from the compression chamber to an ignition injector(s). A thrust nozzle may be configured within the rotor pocket to direct combustion gases therethrough to propel the rotor and increase efficiency.