سیف, فرهاد
وزارت دفاع
[ 1 ] - ارزیابی اثر پارامترهای مختلف بر روی پدیده کوهانی شدن در پیشرانه-های جامد مرکب
By comparing the empirical and predicted performance diagrams of the composite solid propellants, it appears that there is a discrepancy between these two graphs .This deviation has been attributed to spatial burning rate variation which is related to burning rate fluctuation or hump effect. The most important reasons for this spatial burning rate variation are casting process. In order to appr...
[ 2 ] - بررسی مکانیسم سوختن یکنواخت و کاهشی در پیشرانه های جامد دوپایه(علمی-ترویجی)
Solid propellant burning rate is highly dependent on the pressure, so that the combustion duration propellant rocket engines, combustion vibration leads to considerable changes in pressure. This could lead to an explosion in rocket engines. The best case is propellant combustion independent of pressure. Ballistic modifiers added to propellant formulation for reduce pressure sensitivity and re...
[ 3 ] - ارزیابی اثر پارامترهای مختلف بر سرعت سوزش پیشرانه‌های جامد مرکب(علمی-ترویجی)
Investigation shows that the some complex and expanded parameters are effective on the burning rate. In this paper we evaluate the effect of particles dispersion, size of AP particle, the size of Al particles, Fe2O3, viscosity, shape factor, the size of mixer and the mechanical parameters such as tensile and stress on the burning rate. These studies show that the decrease of AP particles, size ...
[ 4 ] - کاربرد‌های روش فرا صوت در ارزیابی موتور های پیشرانه جامد(علمی-ترویجی)
Ultrasonic technique, is one of the best nondestructive techniques for solid propellants motors evaluation. In this article ultrasonic technique use, has been reported for measuring solid propellant burning rate at different pressure with just one experiment and at the moment, for especial motors. The use of swept frequency method in a proper confine frequency and interrupted frequency method h...
[ 5 ] - بررسی نرم کننده های پرانرژی در پیشرانه های جامد (علمی-ترویجی)
In modern energetic propellant formulations, conventional plasticizers are being gradually replaced by energetic plasticizers having nitro, nitroamino, azido and other energetic groups. Energetic Plasticizers used to improve processing, mechanical properties and index of energy. Designer of propellant for decrease migration and improve safety factors in propellant’s formulation should to notice...
[ 6 ] - بررسی روش های ایمن تخلیه موشک های سوخت جامد، انهدام یا بازیابی برخی از اجزاء سوخت (علمی- ترویجی)
After several years, Solid rockets in storage, due to physical and chemical process have been aged and under these conditions performance will largely fall. Because of the risks of keeping aged rockets in depot, solid propellants must be removed and using safe and green methods disposal them. Discharge and disposal of these aged propellants using traditional methods has hazards and environmenta...
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