Experimental Studies of Open Rotor Installation Effects

2011 ◽  
Author(s):  
Michael Czech ◽  
Russell Thomas
Keyword(s):  
Experimental Studies ◽  
Installation Effects ◽  
Open Rotor

Installation Effects on Contra-Rotating Open Rotor Noise

2010 ◽  
Author(s):  
Julien Ricouard ◽  
Emmanuel Julliard ◽  
Magdi Omais ◽  
Vincent Regnier ◽  
Anthony Parry ◽  
...  
Keyword(s):  
Installation Effects ◽  
Rotor Noise ◽  
Open Rotor

Progress in aerodynamic and aeroacoustic integration of CROR propulsion systems

2014 ◽  
Vol 118 (1208) ◽  
pp. 1137-1158 ◽  
Author(s):  
A. Stuermer ◽  
J. Yin ◽  
R. Akkermans
Keyword(s):  
Active Flow Control ◽  
Propulsion Systems ◽  
Trailing Edge ◽  
Transport Aircraft ◽  
Installation Effects ◽  
The Past ◽  
Numerical Studies ◽  
Open Rotor ◽  
Active Flow ◽  
The Impact

Abstract Contra-Rotating Open Rotor (CROR) propulsion systems have seen renewed interest as an economic and environmentally friendly powerplant for future transport aircraft. Installation effects, i.e. the mutual interactions between airframe components and the rotors, have a pronounced impact on the aerodynamic and aeroacoustic performance for this type of engine. In the past five years, DLR’s Institute of Aerodynamics and Flow Technology has performed a number of numerical studies investigating important aspects relating to engine-airframe integration of CROR engines. In this article an overview of coupled aerodynamic and aeroacoustic simulations investigating representative pusher-configuration CROR engines will be given, focusing on the impact on aerodynamic performance and aeroacoustics caused by the presence of a pylon, the potential for noise reduction by employing trailing-edge blowing at the pylon trailing edge as well as the performance and noise variations caused by different senses of rotation of the rotors. It is shown that the interaction with the pylon strongly impacts blade performance and front rotor noise emissions but that the use of active flow control in the form of pylon trailing-edge blowing can alleviate these adverse installation effects to a notable extent.

Installation Effects on Contra-Rotating Open Rotor Noise at High-Speed

2014 ◽  
Author(s):  
Yann Colin ◽  
Fabien Wlassow ◽  
Bastien Caruelle ◽  
Thomas Node-Langlois ◽  
Magdi Omais ◽  
...  
Keyword(s):  
High Speed ◽  
Installation Effects ◽  
Rotor Noise ◽  
Open Rotor

3-D reconstruction and analysis of mammalian mitotic spindle structure

1992 ◽  
Vol 50 (1) ◽  
pp. 578-579
Author(s):  
Kent McDonald ◽  
David Mastronarde ◽  
Rubai Ding ◽  
Eileen O'Toole ◽  
J. Richard McIntosh
Keyword(s):  
Cross Sections ◽  
Mitotic Spindle ◽  
Experimental Studies ◽  
Video Camera ◽  
Three Dimensions ◽  
Mitotic Spindles ◽  
Black And White ◽  
Reconstruction Methods ◽  
Spindle Structure ◽  
Tissue Culture Line

Mammalian spindles are generally large and may contain over a thousand microtubules (MTs). For this reason they are difficult to reconstruct in three dimensions and many researchers have chosen to study the smaller and simpler spindles of lower eukaryotes. Nevertheless, the mammalian spindle is used for many experimental studies and it would be useful to know its detailed structure.We have been using serial cross sections and computer reconstruction methods to analyze MT distributions in mitotic spindles of PtK cells, a mammalian tissue culture line. Images from EM negatives are digtized on a light box by a Dage MTI video camera containing a black and white Saticon tube. The signal is digitized by a Parallax 1280 graphics device in a MicroVax III computer. Microtubules are digitized at a magnification such that each is 10-12 pixels in diameter.

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