Flat-Vee Aero Engine for Diesel Fuel and Vibration Control
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Solution Overview
Problem
Existing aero engines face challenges in operating on readily available and cost-effective diesel fuel or jet fuel, particularly in remote areas where high-octane AvGas is scarce, due to issues like torque signature, fuel system redundancy, turbocharging design, and main bearing loading.
Innovation Solution
A novel 'Flat-Vee' engine design with a unique firing order (1-7-5-3-6-4-2-8) and paired throw crankshaft configuration, allowing for electrically separated bank-to-bank operation, independent turbocharging, and shared systems for redundancy and efficiency, enabling operation on diesel or jet fuel while minimizing weight and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a compression combustion engine is designed to operate on diesel or jet fuel, then fuel availability and cost-effectiveness are improved, but torque signature compatibility with propeller harmonics deteriorates
Solution Approach 1:
The engine is divided into two separate banks (Bank 1 and Bank 2), each capable of independent operation. This segmentation allows the engine to fire cylinders in a sequence that produces a torque signature compatible with propeller harmonics, while maintaining the ability to run on affordable diesel or jet fuel. Each bank can be independently controlled to optimize combustion timing and torque delivery.
Solution Approach 2:
The engine incorporates variable valve timing and injection timing control that allows dynamic adjustment of the firing sequence and torque delivery characteristics. This dynamic control enables the engine to adapt its torque signature to match propeller harmonics requirements while maintaining efficient combustion on diesel or jet fuel.
2Power
If a compression combustion engine is designed with eight cylinders, then power output is improved, but weight increases compared to traditional six-cylinder engines
Solution Approach 1:
The eight-cylinder engine is segmented into two banks of four cylinders each, arranged in a V-configuration. This segmentation allows for a more compact overall engine package compared to a straight-eight configuration, reducing the moment of inertia and allowing the use of smaller, lighter connecting rods and crankshaft components while maintaining the power output benefits of eight cylinders.
3Reliability
If bank-to-bank electrical separation is implemented for redundancy, then system reliability is improved, but device complexity increases
Solution Approach 1:
The electrical system is segmented into two independent bank-to-bank systems, with separate ignition and control systems for Bank 1 and Bank 2. This segmentation provides redundancy - if one bank fails, the other can continue operating independently. The complexity is managed through modular design, where each bank's electrical system is a self-contained unit that can be independently maintained and replaced.
4Reliability
If independent turbocharging for each bank is implemented, then fuel system redundancy is improved, but device complexity increases
Solution Approach 1:
The turbocharging system is segmented into independent turbochargers for Bank 1 and Bank 2, allowing each bank to be independently charged and operated. This provides fuel system redundancy - if one turbocharger or its associated fuel system fails, the other bank can continue operating. The complexity is offset by the ability to independently service and replace individual turbocharger units.
5Object-generated harmful factors
If a unique firing order (1-7-5-3-6-4-2-8) is implemented, then propeller harmonic compatibility is improved, but manufacturing precision requirements increase
Solution Approach 1:
The unique firing order (1-7-5-3-6-4-2-8) creates an asymmetric crankshaft configuration with paired throws arranged to optimize torque delivery and minimize vibrations. This asymmetric design is precisely engineered to match propeller harmonic requirements, and while it demands high manufacturing precision, the benefits in terms of propeller compatibility and reduced vibrations outweigh the manufacturing challenges.
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 engine achieves superior performance, weight competitiveness with air-cooled six-cylinder engines, enhanced fuel efficiency, and improved safety by allowing operation on one bank, stabilizing combustion during descents, and maintaining propeller dynamics with reduced fuel consumption.
Implementation Method 1
a compression combustion engine can burn either diesel fuel or jet fuel (JP) about equally as well
Implementation Method 2
the oil system is sufficient to cool the pistons/engine when the heat from 4 operational cylinders is absorbed in the entire thermal mass of the engine via conduction heat transfer
Data Source
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AI summary
The present invention is an aero engine that is provided with compression combustion and weighs less than 725 lbs. The present invention is further a method of forming the aero engine.