Results 91 to 100 of about 8,641,712 (236)

From Wallops Island to Project Mercury, 1945 - 1958: A memoir [PDF]

Research is described which was conducted at the Wallops Island Missile Range (operated by the old National Advisory Committee for Aeronautics).
Gilruth, R. R.
core   +1 more source

A teleoperated unmanned rotorcraft flight test technique [PDF]

NASA and the U.S. Army are jointly developing a teleoperated unmanned rotorcraft research platform at the National Aeronautics and Space Administration (NASA) Langley Research Center.
Hodges, W. Todd, Phelps, Arthur E., III, Walker, Gregory W.   +2 more
core   +1 more source

Design Methodology for Fishtailed Pipe Diffusers and Its Application to a High-Pressure Ratio Centrifugal Compressor

Aerospace
A high-performance diffuser is crucial for a high-pressure ratio centrifugal compressor to achieve high efficiency. Pipe diffusers have been proven effective in enhancing the performance of such compressors.
Junnan Liu, Dingxi Wang, Xiuquan Huang
doaj   +1 more source

Reduced dimension modeling of leading edge turbulent interaction noise [PDF]

, 2014
A computational aeroacoustics approach is used to model the effects of real airfoil geometry on leading edge turbulent interaction noise for symmetric airfoils at zero angle of attack.
Bailly C., Bechara W., Billson M., Cheong C., Clair V., Sears W. J.   +5 more
core   +1 more source

Numerical Simulations of the Lagrangian Averaged Navier-Stokes (Lans-α) Equations for Forced Homogeneous Isotropic Turbulence [PDF]

, 2001
The modeling capabilities of the Lagrangian Averaged Navier-Stokes-α equations (LANS-α) is investigated in statistically stationary three-dimensional homogeneous and isotropic turbulence. The predictive abilities of the LANS-α equations are analyzed by
Kosović, Branko, Marsden, Jerrold E., Mohseni, Kamran, Shkoller, Steve   +3 more
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The Compound Flux-path Three Phase Stator Hybrid Excited Doubly Salient DC Generator and Its Transient FEM Analysis

Kongzhi Yu Xinxi Jishu, 2011
The field windings and permanent magnets of compound flux-path three-phase stator hybrid excited doubly salient DC generator are on the same cross-section orthogonal to the shaft, where flux excited by field windings and permanent magnets multiplexes the
万伟锐, 严仰光, 陈志辉, 孟小利   +3 more
doaj  

Exploring the Relationships Between a Toxic Workplace Environment, Workplace Stress, and Project Success with the Moderating Effect of Organizational Support: Empirical Evidence from Pakistan

Risk Management and Healthcare Policy, 2020
Zilong Wang,1,* Shah Zaman,1,* Samma Faiz Rasool,2,* Qamar uz Zaman,1,* Asad Amin3,* 1College of Economics and Management, Nanjing University of Aeronautics and Astronautics, Nanjing, 211106, People’s Republic of China; 2School of Innovation and ...
Wang Z, Zaman S, Rasool SF, Zaman Q, Amin A   +4 more
doaj  

Numerical investigation of high-pressure combustion in rocket engines using Flamelet/Progress-variable models

, 2014
The present paper deals with the numerical study of high pressure LOx/H2 or LOx/hydrocarbon combustion for propulsion systems. The present research effort is driven by the continued interest in achieving low cost, reliable access to space and more ...
Coclite A., Cutrone L., Gamal E., Jachimowski J., Marinov N., Meeks E., Prausnitz D., Reid R., Thomas J., Vingert L.   +9 more
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Dimensionless scaling of heat-release-induced planar shock waves in near-critical CO2

, 2017
We performed highly resolved one-dimensional fully compressible Navier-Stokes simulations of heat-release-induced compression waves in near-critical CO2. The computational setup, inspired by the experimental setup of Miura et al., Phys. Rev.
Ismail A. F., Lemmon E.W., Nitsche K., Onuki Akira, Poling Bruce E.   +4 more
core   +1 more source

Routing Multiple Unmanned Vehicles in GPS-Denied Environments

, 2018
This article aims to develop novel path planning algorithms required to deploy multiple unmanned vehicles in Global Positioning System (GPS) denied environments.
Misra, Sohum, Rathinam, Sivakumar, Sharma, Rajnikant, Sundar, Kaarthik, Wang, Bingyu   +4 more
core   +1 more source