نتایج جستجو برای: propellant inhibitor

تعداد نتایج: 212760  

2013
H. Q. Yang Robert E. Harris

Flexible inhibitors are generally used in solid rocket motors (SRMs) as a means to control the burning of propellant. Vortices generated by the flow of propellant around the flexible inhibitors have been identified as a driving source of instabilities that can lead to thrust oscillations in launch vehicles. Potential coupling between the SRM thrust oscillations and structural vibration modes is...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2000
abdolsamad zarrin ghalam moghaddam ali akbar hashemi pour rafsanjani

simultaneous thermal analysis (sta) method has been applied to study decomposition reactions of ap under a flowing nitrogen atmosphere and static air. results obtained indicate that a phase transformation occurs prior to the decomposition reaction. decomposition takes place exothermally in two stages, first stage of decomposition could be suppressed by the controlled heating programme. addition...

ژورنال: مواد پرانرژی 2020

In this study, an efficient and green technique based on ultrasound assisted extraction was developed for separation and determination of some components of double base solid propellant (DB propellant) by high performance liquid chromatography with UV detection (HPLC-UV-Vis the optimum extraction conditions with respect to maximum recovery for target analytes were achieved at 120 min, with powe...

ژورنال: مواد پرانرژی 2020

Cracking is the breaking of bonds in a part of the propellant polymer due to the existing stresses that change the structure of the propellant polymer and they are classified into two general categories: macrocrack and microcrack. The service life of rocket engines is largely a function of the mechanical properties of the solid rocket propellant, the aging characteristics of the rocket propulsi...

ژورنال: مواد پرانرژی 2015

In this study, the combustion characteristics and burning rate of RDX/AP/Al/HTPB composite solid propellant were studied experimentally. Five different RDX-based propellant compositions have been formulated and the burning rate and calorimetric value were evaluated. The burning rates of RDX composite solid propellants increased with increasing RDX content. The data obtained from experimental te...

ژورنال: مواد پرانرژی 2021

In this article aging behavior of composite solid propellant was investigated by determining its mechanical properties at elevated temperatures. For this purpose, three HTPB samples with different microstructures were selected and composite solid propellants were prepared based on them keeping similar other components and aging was studied by accelerated method.  Mechanical properties were meas...

ژورنال: مواد پرانرژی 2018

Owing to the prime importance of ammonium dinitramide (ADN) as an oxidizer in solid propellants, its synthesis has received a great amount of interest. There have been several new and innovative synthesis routes developed by researcher’s worldwide. Liquid-fuel rockets consist of a fuel and oxygen (or other oxidizer) in liquid state. These fractals are already being combined together or combined...

Journal: :Journal of Propulsion and Power 2019

2017
William F. S. Sellers

BACKGROUND Current pressurised metered dose asthma inhaler (pMDI) propellants are not inert pharmacologically as were previous chlorofluorocarbons, have smooth muscle relaxant' partial pressure effects in the lungs and inhaled hydrofluoroalkane 134a (norflurane) has anaesthetic effects. Volumes of propellant gas per actuation have never been measured. METHODS In-vitro studies measured gas vol...

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