Solid rocket motor flows depend strongly on alumina granulometry, which spreads up with coalescence. Solving droplet sizes in unsteady flows is a modeling and numerical challenge, specially when high loadings generate retrocoupling. As an alternative to Lagrangian approaches, the Eulerian Multi-Fluid model describes polydispersity with size-sorted droplet fluids called sections. A two size mome...

Numerical 2D simulation and research on internal flow field and external flow field of rocket motor nozzle using FLUENT software. Analyze the flow condition of internal flow field and external flow field, and according to add in the amount of the different gas components, obtain the clear distribution of contour of density flow field, pressure flow field and various material components and so o...

In solid rocket motors, aluminum particles are included in the propellant to improve the global performances but the distributed combustion of these droplets is suspected to be a driving mechanism of hydrodynamic instabilities. So the accurate simulation of reactive polydisperse sprays strongly coupled to unsteady gaseous flows appears as a major issue for solid rocket motor optimization. In th...

Abstract With the development of high-speed permanent magnet synchronous motors (PMSM), requirements for speed are getting higher and higher, power density increase is bigger bigger. However, too high a loss will cause motor heat dissipation difficulties, resulting in insulation aging demagnetization failure, which seriously affects safe operation motor. Therefore, it necessary to analyze fluid...

The paper deals with faults diagnosis method proposed to detect the inter-turn and turn earth short circuit in stator winding of three-phase high-speed solid rotor induction motors. This based on negative sequence current motor fuzzy neural network algorithm. On basis analysis 2-D electromagnet field impedance has been derived develop equivalent circuit. is simulated by MATLAB software study re...

The advantages/disadvantages of energy storage devices, which can provide nonpolluting automobile systems are discussed. Four types of storage devices are identified: electro-chemical (batteries) hydrogen electro-mechanical (flywheels) Molten salt heat storage A high speed flywheel with a small permanent magnet motor/generator has more advantages than any of the other systems and might become a...

Major constraints while using motor drive system are efficiency and cost. Commutation in the conventional DC motors is carried out by commutator which is rotating part placed on the rotor and brushes. Due to these mechanical parts, conventional DC motor consist high amount of losses. Brushless DC (BLDC) Motors are very extensively used motors these days because of its advantages over convention...

Murata, Akira, Luciano Fadiga, Leonardo Fogassi, Vittorio The results showed that a high percentage of F5 taskGallese, Vassilis Raos, and Giacomo Rizzolatti. Object represenrelated neurons responded to the presentation of 3-D objects, tation in the ventral premotor cortex (area F5) of the monkey. J. most of them showing a remarkable object specificity. The Neurophysiol. 78: 2226–2230, 1997. Vis...

how to cite this article: yıldırım s. inan ar, gül lh, türk börü ü. an acute motor axonal neuropathy (aman) case with motor conductıon blocks in childhood. iran j child neurol. winter 2016; 10(1):65-69. abstract objective characterized with decreased compound muscle action potentials (cmap) and absence of demyelinating findings in electrophysiological studies, is a subtype of guillain-barre syn...

objectives: movement is a continuous aspect of life and an important factor to achieve the goals and meet the needs. regarding the importance of infantś motor assessment and the large number of children with motor disorders, a valid and reliable test is required to help evaluation of motor development and provide appropriate interventions by therapists and educators. this study was implemented ...