Fuel-Air Regulator Location for UAV Drag Reduction
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Solution Overview
Problem
In dual-fluid injection systems for internal combustion engines, particularly in UAVs, the existing fuel-air regulators are often located close to the fuel rail assembly, leading to drag issues during flight and potential inefficiencies in pressure regulation due to their proximity to the fluid delivery device.
Innovation Solution
The fuel-air regulator is relocated to be in close proximity to the air compressor, integrated with its housing, and oriented to facilitate gravity flow of fluids, with a separate air pressure reference path and thermal insulation to maintain air temperature above the dew point, ensuring responsive fuel pressure regulation without introducing pressure fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fuel-air regulator is located close to the fuel rail assembly, then the pressure regulation can be maintained, but drag increases during flight and center of gravity is adversely affected
Solution Approach 1:
The fuel-air regulator is extracted from its conventional location near the fuel rail assembly and relocated to the air compressor housing. This separation removes the harmful drag effect from the regulator's location while maintaining its pressure regulation function through the air pressure reference path.
Solution Approach 2:
The air compressor housing is given a dual function: it continues to compress air for the injection system while also housing the fuel-air regulator. This multi-functionality allows the regulator to be positioned remotely from the fuel rail without adding separate mounting structure or increasing overall system complexity.
2Object-affected harmful factors
If the regulator is relocated remotely from the fluid delivery device, then drag is reduced, but pressure fluctuations may be introduced
Solution Approach 1:
An air pressure reference path is introduced as an intermediary connection between the air compressor and the fuel-air regulator. This reference path transmits air pressure information to the regulator, enabling it to maintain accurate fuel pressure regulation despite being located remotely from the fluid delivery device.
3Device complexity
If the regulator is integrated with the air compressor housing, then device complexity is reduced, but thermal insulation requirements increase to maintain air temperature above dew point
Solution Approach 1:
Thermal insulation is applied locally to the air delivery path and air compressor housing rather than throughout the entire system. This targeted insulation maintains air temperature above the dew point in the critical regions where condensation would occur, while avoiding unnecessary insulation elsewhere in the system.
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 reduces drag, provides a center-of-gravity benefit for UAVs, and maintains reliable fuel injection by ensuring consistent pressure differentials, minimizing condensation and pressure drops, thus enhancing the overall efficiency and performance of the dual-fluid injection system.
Implementation Method 1
a regulator for regulating fuel pressure with reference to air pressure
Implementation Method 2
with a separate air pressure reference path and thermal insulation to maintain air temperature above the dew point
Implementation Method 3
thermal insulation to maintain air temperature above the dew point, ensuring responsive fuel pressure regulation without introducing pressure fluctuations
Implementation Method 4
oriented to facilitate gravity flow of fluids
Data Source
AI summary
A dual-fluid injection system for an internal combustion engine, and an unmanned aerial vehicle (UAV) powered by an engine having the dual-fluid injection system. The dual-fluid injection system comprises a liquid fuel metering device and a fluid delivery device operating in tandem. A gas supply system comprising an air compressor and an air delivery path extending between the air compressor and the fluid delivery device is provided to supply pressurised air to the fluid delivery device. The gas supply system comprises an air compressor and an air delivery path extending between the air compressor and the fluid delivery device. A fuel supply system is adapted to deliver liquid fuel to the liquid fuel metering device. A fuel-air regulator is provided for regulating fuel pressure with reference to air pressure to establish and maintain a requisite pressure differential between the fuel pressure and the air pressure. The fuel-air regulator is located remotely from the fluid delivery device and more particularly in close proximity to the air compressor. In a preferred arrangement, the fuel-air regulator is mounted on or integrated with the air compressor or a part thereof.