Applications of combined electric, high-thrust propulsion systems.

1968 ◽  
Vol 5 (7) ◽  
pp. 785-791 ◽  
Author(s):  
ALFRED C. MASCY ◽  
DUANE W. DUGAN ◽  
SAMUEL W. PITTS
Keyword(s):  
Propulsion Systems ◽  
High Thrust

Transient Hydroelastic Analysis of Pump Performance of an SES-Waterjet System

2012 ◽  
Author(s):  
Michael R. Motley ◽  
Yin L. Young ◽  
Brant R. Savander
Keyword(s):  
Surface Effect ◽  
Dynamic Performance ◽  
Operating Conditions ◽  
Geometric Constraints ◽  
Propulsion Systems ◽  
Structural Dynamic ◽  
Surface Vessels ◽  
Hydroelastic Analysis ◽  
Cargo Capacity ◽  
High Thrust

Surface Effect Ships (SES) have great potential to increase the speed and cargo capacity of modern surface vessels. Waterjets are typically used for propulsion of SES because of the geometric constraints and its ability to absorb high thrust and power requirements. The objective of this paper is to investigate the transient hydroelastic performance of waterjet propulsion systems. The goal is to advance the fundamental understanding of the transient hydrodynamic and structural dynamic performance of waterjet propulsion systems with consideration for non-uniform inflow and transient fluid cavitation at heavily loaded operating conditions. Special attention is given to investigating the effects of flow non-uniformity and fluid cavitation on the system performance, as well as the structural dynamic performance of the rotor and stator blades.

scholarly journals Modular Impulsive Green Monopropellant Propulsion System (MIMPS-G): For CubeSats in LEO and to the Moon

Aerospace ◽  
2021 ◽  
Vol 8 (6) ◽  
pp. 169
Author(s):  
Ahmed E. S. Nosseir ◽  
Angelo Cervone ◽  
Angelo Pasini
Keyword(s):  
High Performance ◽  
System Analysis ◽  
Propulsion System ◽  
Propulsion Systems ◽  
Small Satellites ◽  
Analysis And Design ◽  
Performance Space ◽  
Green Propellants ◽  
Commercial Off The Shelf ◽  
High Thrust

Green propellants are currently considered as enabling technology that is revolutionizing the development of high-performance space propulsion, especially for small-sized spacecraft. Modern space missions, either in LEO or interplanetary, require relatively high-thrust and impulsive capabilities to provide better control on the spacecraft, and to overcome the growing challenges, particularly related to overcrowded LEOs, and to modern space application orbital maneuver requirements. Green monopropellants are gaining momentum in the design and development of small and modular liquid propulsion systems, especially for CubeSats, due to their favorable thermophysical properties and relatively high performance when compared to gaseous propellants, and perhaps simpler management when compared to bipropellants. Accordingly, a novel high-thrust modular impulsive green monopropellant propulsion system with a micro electric pump feed cycle is proposed. MIMPS-G500mN is designed to be capable of delivering 0.5 N thrust and offers theoretical total impulse Itot from 850 to 1350 N s per 1U and >3000 N s per 2U depending on the burnt monopropellant, which makes it a candidate for various LEO satellites as well as future Moon missions. Green monopropellant ASCENT (formerly AF-M315E), as well as HAN and ADN-based alternatives (i.e., HNP225 and LMP-103S) were proposed in the preliminary design and system analysis. The article will present state-of-the-art green monopropellants in the (EIL) Energetic Ionic Liquid class and a trade-off study for proposed propellants. System analysis and design of MIMPS-G500mN will be discussed in detail, and the article will conclude with a market survey on small satellites green monopropellant propulsion systems and commercial off-the-shelf thrusters.

Trajectory options for a manned mission to Mars using high-thrust propulsion systems

2021 ◽  
pp. 96-110
Author(s):  
Nikolay I. ARKHANGELSKIY ◽  
Evgeny I. MUZYCHENKO ◽  
Aleksey A. SINITSYN
Keyword(s):  
Rocket Engine ◽  
Earth Atmosphere ◽  
Optimal Solutions ◽  
Liquid Propellant ◽  
Propulsion Systems ◽  
Performance Factors ◽  
The Earth ◽  
Mission Duration ◽  
High Thrust ◽  
Nuclear Rocket

An analysis has been done of performance factors (mission duration, initial mass of the interplanetary crew transfer vehicle, velocity of the re-entry into the Earth atmosphere of the descent vehicle with the crew) for a single-spacecraft manned mission to Mars using high-thrust propulsion systems. Locally optimal solutions (in terms of delta-V budgets for the transfer) were found for the Earth–Mars–Earth transfer, with varying periods of waiting in Mars orbit, minimal distance to the Sun, as well as flight paths (direct Earth–Mars–Earth transfers vs. gravity assist maneuvers at Venus during Earth–Mars or Mars–Earth transfers). The proposed classification for locally optimal solutions is applicable to both high-thrust propulsion systems and low-thrust propulsion systems. A comparison of performance factors has been done for manned Martian mission options based on liquid-propellant engines and nuclear rocket engines with a 12,5 km/s constraint on the velocity of the manned re-entry vehicle in the Earth atmosphere. Key words: Manned mission to Mars, interplanetary transfer trajectory, high-thrust, liquid-propellant rocket engine, nuclear rocket engine, mission duration, initial mass of the interplanetary vehicle, re-entry velocity of a manned vehicle for returning the crew to Earth.

Naval Hybrid Power Take-Off and Power Take-In – Lessons Learnt and Future Advances

2018 ◽  
Author(s):  
M Benatmane ◽  
B Salter
Keyword(s):  
Electrical Power ◽  
Maritime Industry ◽  
Propulsion Systems ◽  
Systems Architecture ◽  
Hybrid Propulsion ◽  
Leading Role ◽  
Lessons Learnt ◽  
Marine Industry ◽  
Operational Systems ◽  
Great Pressure

With the ever tightening of budgets and legislation, new vessel builds are facing tough times.  The future maritime industry requires more efficient vessels to minimise ship operational costs with cleaner technologies that meet stringent environment regulations, reduce greenhouse gas emissions, specifically carbon emissions. Emissions reduction continues to be high on the agenda for the marine industry, it is responsible for about 2.5 percent of global greenhouse emissions1 and is under great pressure to reduce its environmental impact. With pressure comes the opportunity to incentivize innovation, developments and implementation of energy efficient measures, both design and operational. Naval propulsion systems are no different from other industries, and the industry is exploring ways to optimise propulsion and electrical power generation systems architecture for better performance and efficiency. Electric technology plays a leading role. The paper will: Provide a brief overview about the hybrid propulsion concept, with key electrical, mechanical qualities and issues. Describe different designs configurations and performances of hybrid propulsion systems from demonstrated and operational systems in the commercial and naval world. Cover the lessons learnt in technologies and controls used on such systems. Examine future architectures including energy storage and explore the benefits and the flexibility these can bringto the hybrid propulsion sphere.

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