scholarly journals The Relation between Burning Time and Burning Energy of HTPB - Based Composite Propellant

2021 ◽  
Author(s):  
Ameer Awad Ebrahim Osman
Keyword(s):  
Chemical Process ◽  
Thermodynamic Calculations ◽  
Burning Time ◽  
Composite Propellant ◽  
Caloric Value ◽  
Burning Process ◽  
Experimental Works ◽  
System Energy

This paper represented a result of several visions of chemical phenomenon and several extractions and extrapolations of experimental works which included a relationship between energy related to a  chemical process and the relevant time which is required to achieve this process, but it must be taken into account that those mentioned experimental works hadn’t aimed substantially to study and state this relationship neither implicitly nor explicitly, but the results of those works have been exploited for another field after being compared with the relevant thermodynamic calculations. The  selected case study for this paper was the relation between the burning time of Hydroxyl terminated poly butadiene propellant ( HTPB)  and the caloric value of this material. The results reflected some relationship between the burning time and the change of the system energy during the burning process.

scholarly journals Pressure-Time Study of Slow Burning Rate Ap/HTPB Based Composite Propellant by Using Closed Vessel Test (CVT)

2018 ◽  
Vol 778 ◽  
pp. 268-274
Author(s):  
Amir Mukhtar ◽  
Habib Nasir ◽  
Hizba Waheed
Keyword(s):  
Time History ◽  
Toluene Diisocyanate ◽  
Solid Loading ◽  
Maximum Pressure ◽  
Burning Time ◽  
Closed Vessel ◽  
Composite Propellant ◽  
Powder Charge ◽  
Pressure Buildup ◽  
Pressure Transducers

The Closed vessel (CV) is an equipment used to study the ballistic parameters by recording burning time history, pressure buildup during the process and vivacity of the propellants. It is an apparatus which consists of strong pressure vessel, piezo-electric pressure transducers, sensors and dedicated software. To save time and resources this method is employed instead of dynamic firing while doing research and development of propellants. A measured amount of propellant charge is loaded in the vessel and fired remotely. Ignition is provided by the filament which ignites the black powder charge. In this study, we have used Closed Vessel Tests (CVT) for the first time for recording the ballistic parameters of slow burning composite rocket propellant. We developed a set of composite solid propellant samples containing a mixture of bimodal Ammonium Perchlorate (AP) as an oxidizer, Hydroxy-terminated Polybutadiene (HTPB) as a binder as well as fuel, Dioctyl Sebacate (DOS) as plasticizer, 1-(2-methyl) Aziridinyl Phosphine Oxide (MAPO) as bonding agent and Toluene Diisocyanate (TDI) as curator. Samples were developed by changing the solid loading percentage of bimodal AP particles. By increasing the percentage of AP, the oxidizer-fuel ratio (O/F) increases which effects the ballistic parameters. It is observed that maximum pressure and vivacity increases with increase in solid filler in the propellants. As quantity of AP increases, rate of rise of pressure also increases. CVT firing of each sample was done three times to obtain average burning time and pressure buildup history to evaluate the effect of oxidizer loadings on ballistic parameters of the composite propellant.

Techno-economic and environmental assessment of bioethanol-based chemical process: A case study on ethyl acetate

2010 ◽  
Vol 30 (4) ◽  
pp. 675-684 ◽  
Author(s):  
Nguyen T. Hong Thuy ◽  
Yasunori Kikuchi ◽  
Hirokazu Sugiyama ◽  
Masaru Noda ◽  
Masahiko Hirao
Keyword(s):  
Ethyl Acetate ◽  
Environmental Assessment ◽  
Chemical Process

Graduate Attribute Based Continuous Course Improvement in a Blended Learning Engineering Design Course – A Writing Improvement Case Study

2018 ◽  
Author(s):  
Marnie Vegessi Jamieson ◽  
John M. Shaw
Keyword(s):  
Blended Learning ◽  
Engineering Design ◽  
Chemical Process ◽  
Self Assessment ◽  
Writing Improvement ◽  
Design Project ◽  
Final Design

The Capstone Chemical Process DesignCourse instructors engaged with Writing Across theCurriculum to develop and then provide writing seminarsfor students taking the second blended learning iterationof the design course to address needs identified bystudents in a pre course skill self assessment. The goals ofthis initiative were to further develop students’ technicalwriting abilities, encourage ongoing writing during thecourse, and to help students develop better strategies toprepare preliminary and final design project reports.Students’ attendance and reaction to the voluntaryseminar sessions were measured as part of an armslength survey and used as input to the course continuousimprovement process. The results and follow up steps arereported.

Method for Hazard Analysis of Chemical Process Equipment Taking Domino Effect into Account

2013 ◽  
Vol 321-324 ◽  
pp. 2456-2459
Author(s):  
Ming Liang Chen ◽  
Zhi Qiang Geng ◽  
Qun Xiong Zhu
Keyword(s):  
Chemical Process ◽  
Hazard Analysis ◽  
Process Industry ◽  
Process Equipment ◽  
Process Conditions ◽  
Domino Effect ◽  
Effect Analysis ◽  
Chemical Process Industry ◽  
Chemical Process Equipment

The hazard of chemical process equipment consists of two parts: the inherent hazard of process equipment and the hazard from domino effect among equipments. The inherent hazard of equipment depends on the properties of the substance present in the equipment and the specific process conditions. The domino effect is responsibility for many most destructive accidents in the chemical process industry. However, domino effect is either not considered at all or is done with much less rigour than is warranted. A method was proposed to evaluate the hazard of chemical process equipment. The inherent hazard and the hazard from domino effect were considered in the method. The procedure for the domino effect analysis among equipments was presented to evaluate the hazard from the domino effect. The method was implemented in a case study. The results show that it can be used to select the process equipment which should be intensive monitored.

Method for Estimating the Domino Effect in Quantitative Assessment

2013 ◽  
Vol 319 ◽  
pp. 536-540
Author(s):  
Ming Liang Chen ◽  
Zhi Qiang Geng ◽  
Qun Xiong Zhu
Keyword(s):  
Chemical Process ◽  
Quantitative Assessment ◽  
Process Industry ◽  
Risk Assessments ◽  
Domino Effect ◽  
Chemical Process Industry ◽  
Industrial Sites ◽  
The Impact

Accidents caused by the domino effect are the most destructive accidents in the chemical process industry. These chains of accidents may lead to catastrophic consequences and may affect not only the industrial sites, but also people, environment and economy. However, quantitative risk assessments do not usually take the domino effect into account in a detailed, systematic way, mostly because of its complexity and the difficulties involved in its incorporation. A method for quantitative assessment of domino effects is presented. The consequence and probability of a certain accident can be estimated. The domino sequences from the initial accident to the last accident can be obtained. The method has been implemented in a case study. The results show that it can indeed be used to estimate the impact of the domino effect in quantitative assessment.

A reaction energy profile and fragment attributed molecular system energy change (FAMSEC)-based protocol designed to uncover reaction mechanisms: a case study of the proline-catalysed aldol reaction

2019 ◽  
Vol 21 (30) ◽  
pp. 16694-16705 ◽  
Author(s):  
Ignacy Cukrowski ◽  
George Dhimba ◽  
Darren L. Riley
Keyword(s):  
Reaction Mechanism ◽  
Reaction Mechanisms ◽  
Molecular System ◽  
Chemical Change ◽  
Aldol Reaction ◽  
Energy Profile ◽  
Molecular Fragments ◽  
Reaction Energy ◽  
System Energy

Molecular fragments and their atoms involved in the strongest inter-molecular diatomic and atom–fragment interactions drive a chemical change (explain the reaction mechanism).

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