نتایج جستجو برای: thrust

تعداد نتایج: 9516  

Journal: :Journal of fluid mechanics 2008
Melissa A Green Alexander J Smits

To understand the fluid dynamics of a biologically inspired unsteady low-aspect-ratio propulsor, unsteady pressure distributions were measured and compared with time-averaged thrust performance and wake visualizations. The experiments were performed on rigid rectangular panels with different aspect ratios, pitching in a uniform flow. Panel aspect ratio and pitching amplitude were shown to affec...

2003
Ronald N. Kostoff

A revolutionary approach to identifying pervasive thrust areas (and their relationships) in large textual databases was applied to a compendium of assessments of applied research areas in the Former Soviet Union (FSU) generated by the Foreign Applied Sciences Assessment Center (FASAC). Related thrust areas were combined to yield the following major thrust groupings: IONOSPHERIC HEATING/ MODIFIC...

Average values of< 1- T >where T is the thrust are presented for e: e: AMY data and are compared with their values in hadronic interactions. As far as possible, similar analysis techniques have been employed in the two different interactions. Similar variation with E is observed for this average in both data. The values of < PT> and < PL > relative to the thrust axis in e e are simila...

Journal: :journal of heat and mass transfer research(jhmtr) 2014
mohammad hadi hamedi estakhrsar mehdi jahromi

compressible gas flow inside a convergent-divergent nozzle and its exhaust plume atdifferent nozzle pressure ratios (npr) have been numerically studied with severalturbulence models. the numerical results reveal that, the sst k–ω model give the bestresults compared with other models in time and accuracy. the effect of changes in value ofdivergence half-angle (ε ) on the nozzle performance, thru...

Journal: :TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C 1999

2011
Ivo VESELÝ Dušan ZÁMEČNÍK

This contribution describes the usage of the ducted fan as a possible actuator of a multicopter vehicle. The measurements are focused on both dependence of forward thrust on current consumption and on dependence of forward thrust on RPM. The measurement results of the ducted fan are compared with the measurement results of a regular propeller. The dependence of actual efficiency on static thrus...

2012
D Wang Bo Guo Zheng Wang Peng Shan Shangqiu Hou Zhongxi

This paper investigates the aerodynamic characters of a model ducted fan system, analyses the basic principle of the effect of thrust promotion and torque reduction, discovers the relationship between the revolutions per minute(RPM) of the fan and the characters of thrust, as well as system torque. Firstly a model ducted fan has been designed and manufactured according to the specific structure...

2013
Andreas J. Häusler Alessandro Saccon John Hauser António M. Pascoal Pedro Aguiar

We propose a four-quadrant propeller model suitable for energy-efficient motion planning of autonomous marine vehicles. The model can be used to capture the main features of experimental thrust and torque curves by using a small number of parameters. We explore the connection between the propeller thrust, torque, and efficiency curves and the lift and drag curves of the propeller blades. The mo...

2013
G. M. Bhat S. K. Pandita Yudhbir Singh Sandeep Sharma

The local earthquake events recorded north of Panjal thrust (=Main Central thrust) and Main Boundary Thrust (MBT) by the four broadband seismological observatories located at Jammu, Poonch, Doru and Bani in Jammu and Kashmir from January to May, 2012 have coda magnitudes ranging from 1.7 to 3.8 were used to compute source parameters namely; seismic moment, source radius, and stress drop. These ...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید