scholarly journals High-power inductive electric propulsion operation with alternative propellants

2019 ◽  
Vol 124 (1272) ◽  
pp. 151-169 ◽  
Author(s):  
A. R. Chadwick ◽  
B. Dally ◽  
G. Herdrich ◽  
M. Kim
Keyword(s):  
Experimental Data ◽  
High Power ◽  
Electric Propulsion ◽  
Specific Impulse ◽  
Chemical Properties ◽  
Propulsion Systems ◽  
Experimental Campaign ◽  
Discharge Volume ◽  
Near Future ◽  
Maximum Thrust

ABSTRACTThis paper presents the results of an experimental campaign to measure thruster-relevant parameters for a high-power (180kW) inductive propulsion system utilising Ar, $ {\textrm{O}}_{2}$ , $ \textrm{N}_{2}$ , and $ \textrm{CO}_{2}$ as propellants. Results from the investigation show that inductive thrusters can make use of these propellants without the severe degradation seen in other electric propulsion systems. Furthermore, the collection of experimental data at powers greater than 100kW provides a reference of performance for the high-power electric propulsion devices intended for missions in the near future. Thrust and specific impulse in inductive systems can be improved by preferentially combining the chemical properties of atomic and molecular propellants. The maximum thrust recorded during these experiments was 7.9N, obtained using a combination of argon and oxygen (0.68 Ar + 0.32 $\textrm{O}_{2}$ ). The combination of argon and molecular propellants also decreased thermal losses within the discharge volume. Specific impulse can be doubled for the same input electric power by combining propellants, and future modifications to the thruster geometry and acceleration mechanism can be used to further improve the performance of such systems.

scholarly journals Structures of high-power electric propulsion systems

2021 ◽  
Vol 1 (395) ◽  
pp. 119-131
Author(s):  
I. Gagarinov ◽  
Keyword(s):  
Comparative Analysis ◽  
High Power ◽  
Electric Propulsion ◽  
Propulsion Systems ◽  
Technical Data ◽  
Electric Propulsion System ◽  
Design Solutions ◽  
Oil Tankers ◽  
Made In

Object and purpose of research. This paper discusses structures of high-power electric propulsion systems for ships. The purpose was to give a summary of design solutions made in development of these systems. Materials and methods. This paper relies on academic and technical data, as well on the long-term author’s experience in marine electric propulsion R&Ds. The solution suggested by the author is based on the comparative analysis of design solutions adopted in the development of structures for high-power marine electric power and propulsion systems. Main results. Summary on design solutions for high-power electric propulsion systems of such ships as icebreakers, oil tankers, LNGCs and cruise liners. Conclusion. Results obtained by author were used in the design of the electric propulsion system of the «Lider» nuclear icebreaker and further could be used in design of Arctic vessels.

scholarly journals Overview of Propulsion Systems for Unmanned Aerial Vehicles

Energies ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 455
Author(s):  
Bowen Zhang ◽  
Zaixin Song ◽  
Fei Zhao ◽  
Chunhua Liu
Keyword(s):  
Power Density ◽  
High Power ◽  
Electric Propulsion ◽  
Development Trend ◽  
Propulsion System ◽  
High Power Density ◽  
Propulsion Systems ◽  
Essential Information ◽  
Development Framework ◽  
Future Technologies

Unmanned Aerial Vehicle (UAV) propulsion technology is significantly related to the flight performance of UAVs, which has become one of the most important development directions of aviation. It should be noted that UAVs have three types of propulsion systems, namely the fuel, hybrid fuel-electric, and pure electric, respectively. This paper presents and discusses the classification, working principles, characteristics, and critical technologies of these three types of propulsion systems. It is helpful to establish the development framework of the UAV propulsion system and provide the essential information on electric propulsion UAVs. Additionally, future technologies and development, including the high-power density motors, converters, power supplies, are discussed for the electric propulsion UAVs. In the near future, the electric propulsion system would be widely used in UAVs. The high-power density system would become the development trend of electric UAVs. Thus, this review article provides comprehensive views and multiple comparisons of propulsion systems for UAVs.

scholarly journals A Facility for Testing High-Power Electric Propulsion Systems in Space - A Design Study

2005 ◽  
Author(s):  
Andrew Petro ◽  
Franklin Chang-Diaz ◽  
Charles Sarmiento ◽  
Greg Chavers ◽  
Neil Lemmons ◽  
...  
Keyword(s):  
High Power ◽  
Electric Propulsion ◽  
Design Study ◽  
Propulsion Systems

scholarly journals MPD Thruster Technology and Its Limitations

2021 ◽  
Vol 2 (4) ◽  
Author(s):  
Samarth Patel ◽  
M.S.R. Bondugula ◽  
Srilochan Gorakula
Keyword(s):  
Electric Propulsion ◽  
Specific Impulse ◽  
Empirical Models ◽  
Scaling Factor ◽  
Electrode Erosion ◽  
Propulsion Systems ◽  
Chemical Propulsion ◽  
Mpd Thrusters ◽  
Limiting Value ◽  
Electromagnetic Propulsion

It was realized earlier that chemical propulsion systems utilize fuel very inefficiently, which greatly limits their lifespan. Electric propulsion is into existence to overcome this limitation of chemical propulsion. The magnetoplasmadynamic (MPD) thruster is presently the most powerful form of electromagnetic propulsion. It is the thruster’s ability to efficiently convert MW of electric power into thrust which gives this technology a potential to perform several orbital as well as deep space missions. MPD thruster offers distinct advantages over conventional types of propulsion for several mission applications with its high specific impulse and exhaust velocities. However, MPD thruster has limitations which limits its operational efficiency and lifetime. In this paper, the thruster limitations are reviewed with respect to three operational limits i.e., the onset phenomenon, cathode lifetime, and thruster overfed limits. The dependence and effects of the operational limits on each other is compared using different empirical models to derive a scaling factor that has been found for each geometrical arrangement; a limiting value exists beyond which the operation becomes highly unsteady and electrode erosion occurs. Along with reviewing and proposing methods to overcome power limitations for MPD thrusters, the relation between exit velocity and ratio of electrode’s radius is also verified using Maecker’s formula.

Plasma Sheath Modeling in the Presence of Collisions

2002 ◽  
Author(s):  
Subrata Roy ◽  
Jonathan Poggie ◽  
Datta V. Gaitonde
Keyword(s):  
Experimental Data ◽  
Electric Propulsion ◽  
High Speed ◽  
Noble Gas ◽  
Plasma Sheath ◽  
Third Order ◽  
Plasma Dynamic ◽  
Sheath Region ◽  
Multiple Ionization ◽  
Near Future

The present work develops a finite element discretized one-dimensional formulation for plasma-sheath dynamics, using multi-fluid equations. The applications include dc and rf sheath inside a glow discharge tube and a partially ionized plasma sheath inside a electric propulsion thruster channel. Based on the experimental data for multiple ionization of a noble gas, a third order polynomial has been used as a fit to describe ionization processes. Such a polynomial has been used to self-consistently calculate the rate of ionization in the plasma dynamic equations. The electron and ion number densities of the numerical solution decrease in the plasma-sheath region as expected. The ion velocity, sheath potential and electron temperature profiles also exhibit the expected behavior. The computed sheath potential compares well with the available experimental data. The model needs to be generalized in the near future for potential application to the high-speed air vehicles.

Evaluation of TAL technology applicability to high power (10 kW and above) electric propulsion systems

2001 ◽  
Author(s):  
Sergey Tverdokhlebov ◽  
Alexander Semenkin ◽  
Boris Shoumkin ◽  
Anatolii Kochergin ◽  
Bill Butler ◽  
...  
Keyword(s):  
High Power ◽  
Electric Propulsion ◽  
Propulsion Systems
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