scholarly journals Theoretical and experimental investigations on a rocket propulsion system of projectiles intended for vehicle active protection system

2020 ◽  
pp. 133-143
Author(s):  
Zbigniew Surma ◽  
Zbigniew Leciejewski ◽  
Arkadiusz Dzik ◽  
Marek Białek
Keyword(s):  
Solid Propellant ◽  
Experimental Studies ◽  
Propulsion System ◽  
Protection System ◽  
Chamber Pressure ◽  
Experimental Investigations ◽  
Production Plant ◽  
Rocket Propellants ◽  
Active Protection ◽  
Solid Rocket

The paper presents the results of a research project carried out at the Military University of Technology aimed at designing a technology demonstrator of an active protection system – a smart counter-projectile for combating anti-tank missiles at a fixed distance from the protected object. Since the design of the counter-projectile head includes electronic components sensitive to high loads, a solid propellant rocket motor was used as the propulsion system. Based on the specification and requirements for the propulsion system, the propellant charge and nozzle dimensions were determined, and the performance properties of the designed system (chamber pressure, thrust with time and total thrust pulse), calculated. The tests and analyses were carried out using the known properties of homogenous solid rocket propellants manufactured in Poland. To verify the results of the theoretical analysis, experimental studies were carried out in collaboration with “GAMRAT” Sp. z o.o. Special Production Plant (Jasło, Poland) to validate the selected solid propellant and the initial assumptions made on the operation of the propulsion system of the designed counter-projectile.

Solid Rocket Motor Internal Ballistics Simulation Considering Complex 3D Propellant Grain Geometries

2018 ◽  
pp. 146-169
Author(s):  
Guilherme Lourenço Mejia
Keyword(s):  
Solid Propellant ◽  
Structural Integrity ◽  
Combustion Process ◽  
Burning Surface ◽  
Chamber Pressure ◽  
Computational Tool ◽  
Solid Rocket Motor ◽  
Rocket Motors ◽  
Internal Ballistics ◽  
Solid Rocket

Solid rocket motors (SRM) are extensively employed in satellite launchers, missiles and gas generators. Design considers propulsive parameters with dimensional, manufacture, thermal and structural constraints. Solid propellant geometry and computation of its burning rate are essential for the calculation of pressure and thrust vs time curves. The propellant grain geometry changes during SRM burning are also important for structural integrity and analysis. A computational tool for tracking the propagation of tridimensional interfaces and shapes is then necessary. In this sense, the objective of this work is to present the developed computational tool (named RSIM) to simulate the burning surface regression during the combustion process of a solid propellant. The SRM internal ballistics simulation is based on 3D propagation, using the level set method approach. Geometrical and thermodynamic data are used as input for the computation, while simulation results of geometry and chamber pressure versus time are presented in test cases.

Experimental Studies on Protection Systems of Military Vehicles against RPG Type Missiles

2015 ◽  
Vol 240 ◽  
pp. 244-249
Author(s):  
Robert Panowicz ◽  
Tadeusz Niezgoda
Keyword(s):  
Research Methodology ◽  
Experimental Studies ◽  
Protection System ◽  
Military Vehicles ◽  
Protection Systems ◽  
Active Protection

The aim of this article is to present the results of experimental studies on protection systems of military vehicles against RPG type missiles. The paper presents the research methodology of rod armours and active protection system. On the basis of the presented methodology, both a rod armour and an active protection system were investigated. The effectiveness of these solutions reaches 70% in the rod armour and about 80% in the case of the active protection system.

scholarly journals Innovative Solid Formulations for Rocket Propulsion

2016 ◽  
Vol 18 (3) ◽  
pp. 181 ◽  
Author(s):  
Luigi Tonino DeLuca
Keyword(s):  
Negative Impact ◽  
High Energy ◽  
Industrial Applications ◽  
High Energy Density ◽  
Experimental Investigations ◽  
Rocket Propulsion ◽  
Rocket Propellants ◽  
Dual Metal ◽  
To Come ◽  
Solid Rocket

Solid rocket propulsion enjoys several unique properties favoring its use in space exploration and military missions still for decades to come, in spite of being by far the most mature propulsion technology among those currently employed. Yet, solid rocket propellants also suffer a limited performance in terms of gravimetric specifi c impulse. Although many high-energy density materials have been identifi ed, most of them are far from being practically usable in the short range due to a variety of severe diffi culties, including cost considerations. Presently, no integrated vehicle designs make use of these potential propellant ingredients<br />and formulations. Work is continuing worldwide and a broad overview will be discussed in this paper based on a joint international editorial effort just completed. After a quick historical survey, the current situation in terms of advanced solid oxidizers, metal fuels, and binder systems is scrutinized. Particular attention is paid to Ammonium Dinitramide (ADN)-based formulations to overcome the limitations of the currently used ones based on Ammonium Perchlorate (AP). The latter imply not only a limited gravimetric specifi c impulse but also a negative impact on the environment because of copious emissions of hydrochloric acid (HCl) as well as personal health because of perchlorate competition with iodide in entering the thyroid gland. Based on recent experimental investigations, due to its intrinsic ballistic properties, it turns out that ADN-based dual-oxidizer systems with Albased dual-metal fuels and inert or energetic binders are promising solutions for a variety of solid rocket propulsion aiming respectively at minimizing environmental impact (ADN + Ammonium Nitrate AN) or maximizing performance (ADN + AP). Yet, a lot of work remains to be done in order to upgrade these formulations to industrial applications. In particular, adequate analyses of manufacture, mechanical, and hazard properties are required.

scholarly journals Experimental Evaluation of Airlift Performance for Vertical Pumping of Water in Underground Mines

2021 ◽  
Author(s):  
Parviz Enany ◽  
Oleksandr Shevchenko ◽  
Carsten Drebenstedt
Keyword(s):  
Water Flow ◽  
High Efficiency ◽  
Experimental Studies ◽  
Theoretical Models ◽  
Injection System ◽  
Experimental Investigations ◽  
Flow Mode ◽  
New Device ◽  
Riser Pipe ◽  
Airlift Pump

AbstractThis paper presents experimental studies on the optimization of air–water flow in an airlift pump. Airlift pumps use compressed gas to verticall transport liquids and slurries. Due to the lack of theoretical equations for designing and predicting flow regimes, experimental investigations must be carried out to find the best condition to operate an airlift pump at high efficiency. We used a new air injection system and different submergence ratios to evaluate the output of a simple pump for vertical displacement of water in an underground mine. The tests were carried out in a new device with 5.64 m height and 10.2 cm circular riser pipe. Three air-jacket pipes, at different gas flows in the range of 0.002–0.09 m3/s were investigated with eight submergence ratios. It was found that with the same air flow rate, the most efficient flow of water was achieved when an air jacket with 3 mm diameter holes was used with a submergence ratio between 0.6 and 0.75. In addition, a comparison of practical results with two theoretical models proposed by other investigators showed that neither was able to accurately predict airlift performance in air–water flow mode.

scholarly journals Bioh2, Heat and Power from Palm Empty Fruit Bunch via Pyrolysis-Autothermal Reforming: Plant Simulation, Experiments, and CO2 Mitigation

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4767
Author(s):  
Lifita N. Tande ◽  
Erik Resendiz-Mora ◽  
Valerie Dupont
Keyword(s):  
Agricultural Waste ◽  
Experimental Studies ◽  
Energy Resource ◽  
Autothermal Reforming ◽  
Packed Bed Reactor ◽  
Sub Saharan Africa ◽  
Production Plant ◽  
Pure Hydrogen ◽  
Empty Fruit Bunch ◽  
Bio Oil

Empty fruit bunch, a significant by-product of the palm oil industry, represents a tremendous and hitherto neglected renewable energy resource for many countries in South East Asia and Sub-Saharan Africa. The design and simulation of a plant producing pure hydrogen through autothermal reforming (ATR) of palm empty fruit bunch (PEFB) was carried out based on successful laboratory experiments of the core process. The bio-oil feed to the ATR stage was represented in the experiments and in the simulation by a surrogate bio-oil mixture of 11 organic compounds shown to be main constituents of PEFB oil from previous work, and whose combined elemental composition and volatility was determined to be as close as possible to that of the real PEFB bio-oil. The experiments confirmed that H2 yields close to equilibrium predictions were achievable using an in-house synthetised Rh-Al2O3 catalyst in a packed bed reactor. Initial sensitivity analysis on the plant revealed that feed molar steam to carbon ratio should not exceed 3 for the optimal design of the ATR hydrogen production plant. An overall plant efficiency of 39.4% was obtained for the initial design, this value was improved to 67.5% by applying pinch analysis to enhance the integration of heat in the design. The proposed design renders CO2 savings of about 0.56 kg per kg of raw PEFB processed. The proposed design and accompanying experimental studies together make a strong case on the possibility of polygeneration of H2, heat, and power from an otherwise discarded agricultural waste.

Sign in / Sign up

Export Citation Format

Share Document