System Design for Ammonia Nuclear Thermal Propulsion

2021 ◽  
Author(s):  
Chenrui Mao ◽  
Yu Ji ◽  
Jun Sun ◽  
Zhaoyu Liang ◽  
Lei Shi
Keyword(s):  
System Analysis ◽  
Specific Impulse ◽  
Performance Parameters ◽  
Reactor Physics ◽  
System Parameters ◽  
Deep Space Exploration ◽  
Material Compatibility ◽  
Potential Alternative ◽  
And Storage ◽  
Engine Systems

Abstract Nuclear Thermal Propulsion (NTP) for deep space exploration is promising. Hydrogen is employed as the propellant to enhance the maximized specific impulse of NTP. Whereas, the low boiling point and density of hydrogen lead to several issues related to safety and storage. From the perspective of reactor physics, thermal hydraulics, material compatibility, and experience in the aerospace field, ammonia (NH3) is the alternative propellant to replace hydrogen. To analyze the specific impulse and system parameters of ammonia NTP, the hydrogen expander cycle NTP system analysis program PANES (Program for Analyzing Nuclear Engine Systems) is improved. The thermophysical properties library of ammonia has been increased in PANES. Based on the same thrust with hydrogen NTP, the design and analysis of ammonia NTP systems are carried out. This paper improves the PANES program and calculates the NTP performance parameters for potential alternative propellant ammonia, which provides a reference for the design of ammonia NTP system.

scholarly journals Multi-platform app-embedded model for hybrid air-breathing rocket-cycle engine in hypersonic atmospheric ascent

2021 ◽  
pp. 1-23
Author(s):  
S.E. Tsentis ◽  
V.G. Gkoutzamanis ◽  
A.D. Gaitanis ◽  
A.I. Kalfas
Keyword(s):  
Specific Impulse ◽  
Performance Parameters ◽  
Interested Reader ◽  
Component Level ◽  
Air Breathing ◽  
Evaluation Of Performance ◽  
Embedded Model ◽  
The Impact ◽  
Rocket Technology ◽  
Engine Concept

ABSTRACT This paper presents a performance analysis on a novel engine concept, currently under development, in order to achieve hybrid air-breathing rocket technology. A component-level approach has been developed to simulate the performance of the engine at Mach 5, and the thermodynamic interaction of the different working fluids has been analysed. The bypass ramjet duct has also been included in the model. This facilitates the improved evaluation of performance parameters. The impact of ram drag induced by the intake of the engine has also been demonstrated. The whole model is introduced into a multi-platform application for aeroengine simulation to make it accessible to the interested reader. Results show that the bypass duct modelling increases the overall efficiency by approximately 7%. The model calculates the specific impulse at approximately 1800 seconds, which is 4 times higher than any chemical rocket.

Environmental Mechanisms to Improve the Quality Control System for the Enhancement of Production Competitiveness

2019 ◽  
Vol 10 (3) ◽  
pp. 687
Author(s):  
Lydia N. BELONOZHKO ◽  
Valentina A. IGNATENKO ◽  
Vladimir V. MAYER
Keyword(s):  
Product Quality ◽  
System Analysis ◽  
Practical Experience ◽  
Competitive Advantages ◽  
The Public ◽  
Analysis And Synthesis ◽  
Practical Guidelines ◽  
The Subject ◽  
Methodological Aspects ◽  
And Storage

The purpose of the article is to study the specifics of creating, promoting products and ecology control of quality in the practice of domestic enterprises, as well as forming recommendations for improving the quality system of environmental management to improve product competitiveness in modern conditions. In the process of research, system analysis, economic analysis, ecology analysis and synthesis, statistical and analytical methods, generalization, systematization, structuring were used. It is revealed that the increasing competition, the diversity of the same goods in the same price segment directs enterprises to search for new ways to create additional competitive advantages aimed at winning customer loyalty. The current situation requires quality management at all stages of the promotion of food to the consumer – from the production of agricultural products, their processing, transportation and storage to the sale to the public. The article studied practical experience. Problems were identified, theoretical and methodological aspects of the subject of research were investigated, on the basis of which scientific, methodological and practical guidelines were developed for structuring the system of product quality ecology management, choosing directions for improving the management of enterprise competitiveness through improving product quality.

PHYSICAL PROPERTIES AND STORAGE STABILITY OF GEOPOLYMER MODIFIED ASPHALT BINDER

2016 ◽  
Vol 78 (7-2) ◽  
Author(s):  
Ahmad Nazrul Hakimi Ibrahim ◽  
Nur Izzi Md. Yusoff ◽  
Norliza Mohd Akhir ◽  
Muhamad Nazri Borhan
Keyword(s):  
Physical Properties ◽  
Storage Stability ◽  
Permanent Deformation ◽  
Asphalt Binder ◽  
Asphalt Binders ◽  
Modified Asphalt ◽  
Modified Asphalt Binder ◽  
Potential Alternative ◽  
Modified Binder ◽  
And Storage

This study was conducted to investigate the physical properties and storage stability of the 80/100 penetration grade asphalt modified with geopolymer. In this research, fly ash and alkali activators, namely sodium silicate (Na2SiO3) and sodium hydroxide (NaOH), were used as geopolymer components. The penetration, Ring and Ball softening point, ductility, and viscosity tests were conducted to determine the physical properties of geopolymer modified asphalt (GMA). Five samples of asphalt binders with varying percentages of geopolymer, namely 0, 3, 5, 7 and 9%, by weight of asphalt binder were studied. Results show that geopolymer has good compatibility with asphalt binder. The addition of geopolymer into asphalt binder resulted in improved permanent deformation resistance of the modified binder compared to that of the conventional asphalt. In conclusion, geopolymer could be considered as a potential alternative in the modification of the properties of asphalt binder.

SYSTEM ANALYSIS OF THE BLOCKCHAIN DATA EXCHANGE AND STORAGE TECHNOLOGY

2017 ◽  
Vol 3 (55) ◽  
Author(s):  
Vlasov A.I. ◽  
◽  
Karpunin A.A. ◽  
Novikov I.O. ◽  
◽  
...  
Keyword(s):  
Data Exchange ◽  
System Analysis ◽  
Storage Technology ◽  
And Storage

scholarly journals Nonlinear Decomposition Principle and Fundamental Matrix Solutions for Dynamic Compartmental Systems

2018 ◽  
Author(s):  
Huseyin Coskun
Keyword(s):  
Mathematical Method ◽  
Fundamental Matrix ◽  
Nonlinear Dynamic ◽  
System Analysis ◽  
Dynamic Method ◽  
Compartmental Systems ◽  
Mathematical System ◽  
Nonlinear Decomposition ◽  
And Storage ◽  
Decomposition Principle

A decomposition principle for nonlinear dynamic compartmental systems is introduced in the present paper. This theory is based on the mutually exclusive and exhaustive, analytical and dynamic, novel system and subsystem partitioning methodologies. A deterministic mathematical method is developed for the dynamic analysis of nonlinear compartmental systems based on the proposed theory. The dynamic method enables tracking the evolution of all initial stocks, external inputs, and arbitrary intercompartmental flows, as well as the associated storages derived from these stocks, inputs, and flows individually and separately within the system. The transient and the dynamic direct, indirect, acyclic, cycling, and transfer (diact) flows and associated storages transmitted along a particular flow path or from one compartment--directly or indirectly--to any other are then analytically characterized, systematically classified, and mathematically formulated. Thus, the dynamic influence of one compartment, in terms of flow and storage transfer, directly or indirectly on any other compartment is ascertained. Consequently, new mathematical system analysis tools are formulated as quantitative system indicators. The proposed mathematical method is then applied to various models from literature to demonstrate its efficiency and wide applicability.

The DOE National Hydrogen Storage Project: Recent Progress in On-Board Vehicular Hydrogen Storage

2005 ◽  
Vol 885 ◽  
Author(s):  
Carole Read ◽  
John Petrovic ◽  
Grace Ordaz ◽  
Sunita Satyapal
Keyword(s):  
Hydrogen Storage ◽  
System Analysis ◽  
Storage System ◽  
Department Of Energy ◽  
Centers Of Excellence ◽  
Cost Constraints ◽  
New Concepts ◽  
And Storage ◽  
Independent University ◽  
Transportation Applications

ABSTRACTHydrogen is under consideration by several countries for its potential as an energy carrier for transportation applications. In order to compete with vehicles in use today, hydrogen-powered vehicles will require a driving range of greater than 300-miles in order to meet customer needs and expectations. For the overall vehicular light-duty fleet, this dictates that a range of 5 to 13 kg of hydrogen be stored on-board (assuming a fuel cell power plant) within stringent system weight, volume, and cost constraints. Vehicular hydrogen storage thus constitutes a major scientific and technological challenge. To meet this challenge, the U.S. Department of Energy (DOE) initiated a “National Hydrogen Storage Project” with roughly 40 universities, 15 companies and 10 federal laboratories, actively engaged in hydrogen storage research. Centers of Excellence in metal hydrides, chemical hydrides, and carbon-based materials have been established, as well as independent university and industry projects in the areas of new concepts/materials, hydrogen storage testing, and storage system analysis. Recent technical progress in each of these areas is discussed.

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