Development of a High Burn Rate Non - Aluminized Composite Propellant with Low Burn Rate Pressure Index

2011 ◽  
Author(s):  
Kumar Ishitha ◽  
P. Ramakrishna
Keyword(s):  
Composite Propellant ◽  
Pressure Index ◽  
Burn Rate

Review of Composite Propellant Burn Rate Modeling

AIAA Journal ◽  
1980 ◽  
Vol 18 (3) ◽  
pp. 277-293 ◽  
Author(s):  
Norman S. Cohen
Keyword(s):  
Composite Propellant ◽  
Burn Rate

scholarly journals Solid Fuel rich Propellant Development for use in a Ramjet to Propel an Artillery Shell

2020 ◽  
Vol 70 (3) ◽  
pp. 329-335
Author(s):  
Velari Yogeshkumar ◽  
Nikunj Rathi ◽  
P. A. Ramakrishna
Keyword(s):  
High Pressure ◽  
Tensile Strength ◽  
Ammonium Perchlorate ◽  
Solid Fuel ◽  
Pressure Index ◽  
Time Period ◽  
Ballistic Properties ◽  
Base Bleed ◽  
Burn Rate ◽  
Artillery Shell

This study describes the development of a fuel-rich propellant to be used in a solid fuel ramjet to provide active propulsion to a 155 mm artillery shell. Fuel-rich propellants consisting of aluminum, ammonium perchlorate and hydroxyl terminated polybutadiene were developed and their ballistic properties were measured to choose the appropriate fuel for the ramjet application. The attempts made were to enhance the burn rates of the propellant to provide required burn rates at lowest possible pressures in primary combustor of the ramjet. The propellant selection was done with reference of working time period of the base bleed unit, to calculate the required burn rate and corresponding pressure in primary combustor. It was observed that the fuel rich propellant of composition 35% ammonium perchlorate with 1 % Iron oxide embedded on it, 30 % mechanically activated aluminum with 10% polytetrafluoroethylene, and 25 % HTPB was found suitable for the above application. This provided the higher burn rates among all developed propellants with high pressure index of 0.58. This makes it suitable for the ramjet requiring higher burn rates at lower possible primary chamber pressures. The Young’s modulus and tensile strength of this propellant was measured to be 1.73 MPa and 0.24 MPa, respectively.

Graphene-iron oxide nanocomposite (GINC): an efficient catalyst for ammonium perchlorate (AP) decomposition and burn rate enhancer for AP based composite propellant

RSC Advances ◽  
2015 ◽  
Vol 5 (3) ◽  
pp. 1950-1960 ◽  
Author(s):  
Abhijit Dey ◽  
Javaid Athar ◽  
Pankaj Varma ◽  
Hima Prasant ◽  
Arun K. Sikder ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Ammonium Perchlorate ◽  
Composite Propellant ◽  
Efficient Catalyst ◽  
Burn Rate

Development of a facile and ecofriendly route for the synthesis of GINC, followed by characterization and evaluation in propellants for missiles.

Ankle Brachial Pressure Index and compression application: Review summary

2019 ◽  
Vol 27 (2) ◽  
pp. 74-77
Author(s):  
Victoria Team ◽  
Georgina Gethin ◽  
John D Ivory ◽  
Kimberley Crawford ◽  
Ayoub Bouguettaya ◽  
...  
Keyword(s):  
Content Analysis ◽  
Clinical Practice ◽  
Venous Insufficiency ◽  
Arterial Disease ◽  
Leg Ulcers ◽  
Current Clinical Practice ◽  
Ankle Brachial Pressure Index ◽  
Arterial Circulation ◽  
Pressure Index ◽  
Peripheral Arterial

Venous leg ulcers (VLUs) are a significant complication amongst persons with chronic venous insufficiency (CVI) that frequently follow a cycle of healing and recurrence. Current clinical practice guidelines (CPGs) recommend applying below knee compression to improve VLU healing. Compression could be applied if the Ankle Brachial Pressure Index (ABPI) rules out significant arterial disease, as sufficient peripheral arterial circulation is necessary to ensure safe compression use. We conducted a content analysis of 13 global CPGs on the accuracy of recommendations related to ABPI and compression application. Eight CPGs indicated that compression is recommended when the ABPI is between 0.8 and 1.2 mmHg. However, this review found there is disagreement between 13 global VLU CPGs, with a lack of clarity on whether or not compression is indicated for patients with ABPIs between 0.6 and 0.8 mmHg. Some CPGs recommend reduced compression for treatment of VLUs, while others do not recommend any type of compression at all. This has implications for when it is safe to apply compression, and the inconsistency in evidence indicates that specialist advice may be required at levels beyond the ABPI “safe” range listed above.

Impacts of anthropogenic pressure on the degradation of the forest of Doui Thabet (Saida, Western Algeria) in the context of the restoration

2020 ◽  
Vol 7 (2) ◽  
pp. 88-97
Author(s):  
Aouadj Sid Ahmed ◽  
Nasrallah Yahia ◽  
Hasnaoui Okkacha ◽  
Khatir Hadj
Keyword(s):  
Limiting Factor ◽  
Global Changes ◽  
Anthropogenic Pressure ◽  
Qualitative And Quantitative ◽  
Pressure Index ◽  
High Plateau ◽  
The Face ◽  
Western Algeria ◽  
Restoration Strategies ◽  
Very High

AbstractThe forest of Doui Thabet is one of the forests of the Mounts of Saida (Western Algeria) which is experiencing a dynamic regressive. Located in the semi-arid bioclimatic stage, it is located at the edge of two phytogeographic sub-sectors: atlas Tellien Oranais (O3) and high plateau subsector (H1). Among the factors that threaten to curb this fragile and weakened ecosystem, in addition to drought and climate aridity and which has become a structural ecological phenomenon; the overgrazing is also a major limiting factor. This current study provides a qualitative and quantitative assessment of anthropogenic pressure exerted in this area zone. The methodology adopted in this study is that of Le Houerou (1969) and Montoya (1983), which it is based on the calculation of the annual needs of the herd in forage units, the estimate of the feed potential of production, the coefficient of overgrazing and in addition to the anthropogenic pressure index. The result of the forage balance in the forest rangelands of the studied area has a forage deficit (overload) of (96.64%) (a sylvopastoral imbalance), in addition to that, the coefficient of overgrazing is (92.3%) and the anthropogenic pressure index is very high (28). The conservation and the restoration of this area is a major concern in the face of global changes, taking into account their mode of reproduction and their dynamics, for the development of restoration strategies and more effective ways of protection.

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