Rotary Engine Fuel Injection Layout for Rotor Cooling and Torque
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Rotary combustion engines, such as Wankel engines, face issues with rotor overheating leading to potential damage and failure, and multifuel engines are desirable for adaptability but require improved efficiency and cooling mechanisms.
Innovation Solution
Incorporation 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 mixture to the ignition-combustion chamber, and a rotor pocket for initial ignition and combustion, utilizing intake and ignition injectors with check valves to manage gas flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If fuel is sprayed onto the rotor in the intake chamber, then rotor cooling is improved, but device complexity increases due to additional intake spray injectors
Solution Approach 1:
The fuel injection system is segmented into two distinct subsystems: intake spray injectors for rotor cooling and ignition injectors for combustion. This segmentation allows each injector type to be optimized for its specific function, with intake spray injectors delivering fuel at lower pressure for cooling purposes while ignition injectors deliver fuel at higher pressure for combustion.
Solution Approach 2:
The intake spray injectors serve multiple functions: they cool the rotor through evaporative cooling, deliver fuel for initial combustion, and prepare the air-fuel mixture for the ignition chamber. This multi-functionality reduces the need for separate dedicated cooling systems.
2Productivity
If a supplemental air-fuel conduit is added to deliver compressed mixture, then combustion efficiency is improved, but 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, combining multiple flow paths into a single integrated conduit that delivers the mixture directly to the ignition-combustion chamber for improved combustion efficiency.
Solution Approach 2:
The compression chamber pre-compresses the air-fuel mixture before it enters the ignition-combustion chamber through the supplemental conduit. This preliminary compression action prepares the mixture for more efficient and complete combustion in the ignition chamber.
3Reliability
If check valves are installed to prevent gas backflow, then reliability is improved, but device complexity increases
Solution Approach 1:
Check valves are installed as intermediary components in the supplemental air-fuel conduit to prevent combusting gases from flowing back into the compression chamber. These valves act as one-way gates that maintain proper gas flow direction without requiring complex active control systems.
4Power
If rotor pocket shape is optimized for thrust, then torque production is improved, but manufacturing precision requirements increase
Solution Approach 1:
The rotor pocket is designed with specific local geometric features including a thrust surface and optimized curvature in the combustion chamber area. These local quality modifications to the pocket shape create thrust forces from combustion gases that enhance torque production while maintaining compatibility with standard manufacturing processes.
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
Effectively cools the rotor through evaporative cooling, enhances torque production, and improves engine efficiency by controlling auto-ignition parameters and utilizing a thrust nozzle for directed combustion force.
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 thrust nozzle may be configured within the rotor pocket to direct the flow of combusting air-fuel mixture back toward the trailing edge of the rotor pocket to enhance torque
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.