Zobrazeno 1 - 10
of 14
pro vyhledávání: '"L. J. Bober"'
Publikováno v:
Modern pediatrics. Ukraine. :15-21
The aim of the study was to analyze the data of Ukrainian cystic fibrosis (CF) patients entered to the European Cystic Fibrosis Society Patient Registry (ECFSPR) during 2017–2018 years, and compare with the parameters entered in previous years. Mat
Publikováno v:
Journal of Propulsion and Power. 7:452-461
Two Euler analysis techniques, finite difference and finite volume, are employed to predict the blade surface pressure distributions of a large scale advanced propeller. The predicted pressure distributions are compared with wind tunnel data. Both te
Publikováno v:
Journal of Propulsion and Power. 3:277-282
A three-dimensional Euler code, previously developed for high-speed propellers, was rewritten and vectorized for the Cray computer. First-order accurate, implicit integration was combined with approximate factorization, central differences, and const
Publikováno v:
AIAA Journal. 24:1043-1045
Propeller noise in the acoustic near field is presently determined through the integration of the pressure-time history in the tangential direction of a numerically generated flowfield around a propfan of SR-3 type, including the shock wave system in
Autor:
L. K. Chang, L. J. Bober
Publikováno v:
17th Joint Propulsion Conference.
The assumptions on which conventional propeller aerodynamic performance analyses are based can be seriously violated when advanced high speed propellers are analyzed. Studies were performed using a lifting line representation for the propeller to det
Publikováno v:
21st Aerospace Sciences Meeting.
To overcome the limitations of classical propeller theory, a computer program, NASPROP-E, was developed which solves for the flow field surrounding a multibladed propeller and axisymmetric nacelle combination using a finite difference method. The gov
Publikováno v:
12th Propulsion Conference.
A combined experimental and analytical program was conducted to investigate the effects of boundary layer changes on the flow over high angle boattail nozzles. The tests were run on an isolated axisymmetric sting mounted model. Various boattail geome
Publikováno v:
21st Joint Propulsion Conference.
A three-dimensional Euler code, previously developed for high speed propellers, was rewritten and vectorized for the Cray computer. Calculations were compared with previous results and measurements. The new code requires less memory and is more than
Publikováno v:
22nd Joint Propulsion Conference.
An implicit approximate factorization scheme in conjunction with a new boundary treatment was used to compute the inviscid flow field about an advanced high-speed propeller. The method of characteristics was used to apply impermeable boundary conditi
Publikováno v:
21st Aerospace Sciences Meeting.
An argon ion laser velocimeter with four beams was used to measure the detailed flow-field of an advanced eight blade propeller with 45% of tip sweep in an 8x6 foot supersonic wind tunnel. Data were obtained at a free stream Mach number of 0.8, the d