The Experts below are selected from a list of 9 Experts worldwide ranked by ideXlab platform
Cherif Chokri - One of the best experts on this subject based on the ideXlab platform.
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Study of tensile behavior for high-performance fiber materials under high-temperature loads
Sage, 2019Co-Authors: Younes Ayham, Sankara Vignaesh, Seidel André, Cherif ChokriAbstract:Textile high-performance filament yarn subjected to extremely high thermal loads can be found in various technical application fields. Besides the mechanical loads, textile fiber materials have to also satisfy high safety requirements in these applications with respect to thermal loads. Some of the main fields of application in the field of mechanical engineering are turbines, drive devices, rocket components and fire protection coatings. Textile grid-like structures are also being increasingly used in civil engineering as reinforcements (textile concretes). The design and development of textile structures for these applications demands studying and acquiring the material behavior under high thermal loads. Neither sufficient data nor Standardized testing methods have been extensively achieved for evaluating the tensile characteristics of filament yarns under thermal influences. Hence, studying the thermal behavior of these yarns, which are used as input material for the reinforcing structures, is essential. The impact of the Standard Atmospheric Condition on the oxidation behavior of the yarns, as in the case of carbon filament yarns and their influence on the physicochemical and tensile mechanical properties, have to be studied as well. This paper aims to address this issue and provides an insight into the current research about the development and realization of a novel test stand and the subsequent study of tensile mechanical behavior for textile high-performance fiber material under extreme thermal loads together with their physicochemical behavior
Lin Xianwu - One of the best experts on this subject based on the ideXlab platform.
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analysis and suggestion of Standard Atmospheric Condition at super altitude for chinese artillery
Journal of Ballistics, 2007Co-Authors: Lin XianwuAbstract:Atmospheric parameters above 30 km altitude for Chinese artillery are lacking in Standard Atmospheric Condition.Aiming at this problem,the dynamic model was presented according to the high-altitude Atmospheric Condition satisfying the ballistic design,ballistic Standardization,firing table compilation of super-range high-altitude rocket.Based on analysis of Atmospheric data measured by high-altitude rocket,the variation laws of air temperature,air pressure,air density following the height were analyzed.The Standard meteorologic Condition under 30 km altitude was brought forward which can be used to carry out the study of high-altitude rocket preliminarily.Taking long-range rocket of 150 km range for example,the effects of different high-altitude meteorologic Conditions on trajectory were analyzed.It offers reference for the study of long-range rocket with high-altitude.
Md Nurun Nabi - One of the best experts on this subject based on the ideXlab platform.
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theoretical investigation of engine thermal efficiency adiabatic flame temperature nox emission and combustion related parameters for different oxygenated fuels
Applied Thermal Engineering, 2010Co-Authors: Md Nurun NabiAbstract:Abstract This paper deals with theoretical investigation of engine thermal efficiency, specific heat at constant pressure ( Cp ), gas temperature, molecular number, adiabatic flame temperature, oxides of nitrogen (NO x ) emission, and some fundamental combustion-related parameters such as theoretical air fuel ratio (AFR), lower calorific value (LCV) and ratio of LCV and theoretical AFR for different oxygenated fuels. The computations are carried out at Standard Atmospheric Condition. Pentadecane (PD) was used as a base fuel in this computation. The results showed that almost all of the above combustion-related parameters are closely related to oxygen content in the fuels. The ratio of LCV and theoretical AFR is constant for all kinds of oxygenated fuels regardless of the oxygen content in their molecular structure. One of the interesting findings of this work is that with the increase in oxygen content in the fuels adiabatic flame temperature decreases linearly consequently NO x emission decreased linearly. The engine thermal efficiency is almost unchanged below oxygen content of 30% w/w, but gradually decreased above 30% w/w. The reduction in NO x emission is associated with the reduction in adiabatic flame temperature for the oxygenated fuels, while the reduction of engine thermal efficiency above 30% w/w of oxygen associated with the increase in gas specific heat.
Younes Ayham - One of the best experts on this subject based on the ideXlab platform.
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Study of tensile behavior for high-performance fiber materials under high-temperature loads
Sage, 2019Co-Authors: Younes Ayham, Sankara Vignaesh, Seidel André, Cherif ChokriAbstract:Textile high-performance filament yarn subjected to extremely high thermal loads can be found in various technical application fields. Besides the mechanical loads, textile fiber materials have to also satisfy high safety requirements in these applications with respect to thermal loads. Some of the main fields of application in the field of mechanical engineering are turbines, drive devices, rocket components and fire protection coatings. Textile grid-like structures are also being increasingly used in civil engineering as reinforcements (textile concretes). The design and development of textile structures for these applications demands studying and acquiring the material behavior under high thermal loads. Neither sufficient data nor Standardized testing methods have been extensively achieved for evaluating the tensile characteristics of filament yarns under thermal influences. Hence, studying the thermal behavior of these yarns, which are used as input material for the reinforcing structures, is essential. The impact of the Standard Atmospheric Condition on the oxidation behavior of the yarns, as in the case of carbon filament yarns and their influence on the physicochemical and tensile mechanical properties, have to be studied as well. This paper aims to address this issue and provides an insight into the current research about the development and realization of a novel test stand and the subsequent study of tensile mechanical behavior for textile high-performance fiber material under extreme thermal loads together with their physicochemical behavior
Sankara Vignaesh - One of the best experts on this subject based on the ideXlab platform.
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Study of tensile behavior for high-performance fiber materials under high-temperature loads
Sage, 2019Co-Authors: Younes Ayham, Sankara Vignaesh, Seidel André, Cherif ChokriAbstract:Textile high-performance filament yarn subjected to extremely high thermal loads can be found in various technical application fields. Besides the mechanical loads, textile fiber materials have to also satisfy high safety requirements in these applications with respect to thermal loads. Some of the main fields of application in the field of mechanical engineering are turbines, drive devices, rocket components and fire protection coatings. Textile grid-like structures are also being increasingly used in civil engineering as reinforcements (textile concretes). The design and development of textile structures for these applications demands studying and acquiring the material behavior under high thermal loads. Neither sufficient data nor Standardized testing methods have been extensively achieved for evaluating the tensile characteristics of filament yarns under thermal influences. Hence, studying the thermal behavior of these yarns, which are used as input material for the reinforcing structures, is essential. The impact of the Standard Atmospheric Condition on the oxidation behavior of the yarns, as in the case of carbon filament yarns and their influence on the physicochemical and tensile mechanical properties, have to be studied as well. This paper aims to address this issue and provides an insight into the current research about the development and realization of a novel test stand and the subsequent study of tensile mechanical behavior for textile high-performance fiber material under extreme thermal loads together with their physicochemical behavior
