scholarly journals Voltage synchronisation for hybrid-electric aircraft propulsion systems

2021 ◽  
pp. 1-20
Author(s):  
K. Ibrahim ◽  
S. Sampath ◽  
D. Nalianda
Keyword(s):  
Electrical Power ◽  
Potential Method ◽  
Propulsion System ◽  
System Level ◽  
Flux Variation ◽  
Power Sources ◽  
Electric Aircraft ◽  
Hybrid Electric ◽  
Aircraft Propulsion System ◽  
Aircraft Propulsion

Abstract Increasing demand for commercial air travel is projected to have additional environmental impact through increased emissions from fuel burn. This has necessitated the improvement of aircraft propulsion technologies and proposal of new concepts to mitigate this impact. The hybrid-electric aircraft propulsion system has been identified as a potential method to achieve this improvement. However, there are many challenges to overcome. One such challenges is the combination of electrical power sources and the best strategy to manage the power available in the propulsion system. Earlier methods reviewed did not quantify the mass and efficiency penalties incurred by each method, especially at system level. This work compares three power management approaches on the basis of feasibility, mass and efficiency. The focus is on voltage synchronisation and adaptation to the load rating. The three methods are the regulated rectification, the generator field flux variation and the buck-boost. This comparison was made using the propulsion system of the propulsive fuselage aircraft concept as the reference electrical configuration. Based on the findings, the generator field flux variation approach appeared to be the most promising, based on a balance of feasibility, mass and efficiency, for a 2.6MW system.

A method to improve the efficiency of an electric aircraft propulsion system

Energy ◽  
2017 ◽  
Vol 140 ◽  
pp. 436-443 ◽  
Author(s):  
Shaohua Ma ◽  
Shuli Wang ◽  
Chengning Zhang ◽  
Shuo Zhang
Keyword(s):  
Propulsion System ◽  
Electric Aircraft ◽  
Aircraft Propulsion System ◽  
Aircraft Propulsion

Performance Assessment of an Integrated Parallel Hybrid-Electric Propulsion System Aircraft

2019 ◽  
Author(s):  
Smruti Sahoo ◽  
Xin Zhao ◽  
Konstantinos G. Kyprianidis ◽  
Anestis Kalfas
Keyword(s):  
Performance Assessment ◽  
Electric Propulsion ◽  
Electrical Power ◽  
Propulsion System ◽  
System Level ◽  
Electric Propulsion System ◽  
The Core ◽  
Parallel Hybrid ◽  
Overall Efficiency ◽  
Hybrid Electric

Abstract Hybrid-electric propulsion system promises avenues for a greener aviation sector. Ground research work was performed in the past for the feasibility assessment, at the system level, for such novel concepts and the results showed were promising. Such designs, however, possess unique challenges from an operational point of view, and for sizing of the sub-system components; necessitating further design space exploration for associating with an optimal operational strategy. In light of the above, the paper aims at presenting an operational analysis and performance assessment study, for a conceptualised parallel hybrid design of an advanced geared turbofan engine, based on 2035 timeframe technology level. It is identified that the hybrid power operation of the engine is constrained with respect to the requirement of maintaining an adequate surge margin for the low pressure side components; however, a core re-optimised engine design with consideration of electrical power add-in for the design condition, relieves such limit. Therefore such a design, makes it suitable for implementation of higher degree of hybridisation. Furthermore, performance assessment is made both at engine and engine-aircraft integrated level for both scenarios of hybrid operation and the benefits are established relative to the baseline engine. The performance at engine level engine specific fuel consumption (SFC), thrust specific power consumption (TSPC), and overall efficiency, shows improvement in both hybridised scenarios. Improvement in SFC is achieved due to supply of the electrical power, whereas, the boost in TSPC, and overall efficiency is attributed to the use of higher efficiency electrical drive system. Furthermore, it is observed that while the hybridised scenario performs better at engine level, the core re-optimised design exhibits a better saving for block fuel/energy consumption, due to the considerable weight savings in the core components.

scholarly journals Electric Aircraft Propulsion

2021 ◽  
Vol 51 (4) ◽  
pp. 49-66
Author(s):  
Adam Kozakiewicz ◽  
Tomasz Grzegorczyk
Keyword(s):  
Energy Density ◽  
Electric Propulsion ◽  
Electrical Power ◽  
Global Scale ◽  
Propulsion Systems ◽  
Power Sources ◽  
Aerospace Applications ◽  
Flight Operations ◽  
Electric Aircraft ◽  
Aircraft Propulsion

Abstract This paper presents the state of the art in electric aircraft propulsion systems. The necessary reduction of greenhouse gas emissions on the global scale forces aviation engineers to search for ‘green’ solutions. Electric aircraft propulsion is a potential and relatively intuitive choice for a reduction of emissions in flight operations. This paper showcases four architectures of aircraft propulsion systems being now considered to utilise the advantages of electric propulsion with commercially profitable operating range and payload capabilities. One of the largest technological obstacles to the widespread use of electric propulsion in aviation is the low energy density of modern electric batteries. This paper presents the types of power supply which may achieve an energy density above the minimum threshold of 500 Wh/kg, and alternative onboard electrical power sources. The paper also shows novel designs of electric motors intended for aerospace applications. The final sections of this paper shows the implemented projects of aircraft with electric propulsion and the electric aircraft propulsion research projects underway around the world.

Effect of Hot Probe Temperature on Ignition of Alcohol-to-Jet (ATJ) Fuel Spray under Aircraft Propulsion System Conditions

2021 ◽  
Author(s):  
Je Ir Ryu ◽  
Austen Motily ◽  
Tonghun Lee ◽  
Riccardo Scarcelli ◽  
Sibendu Som ◽  
...  
Keyword(s):  
Propulsion System ◽  
Fuel Spray ◽  
Hot Probe ◽  
Aircraft Propulsion System ◽  
Aircraft Propulsion
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