@article{(Open Science Index):https://publications.waset.org/pdf/6695,
	  title     = {Numerical Study on Parametrical Design of Long Shrouded Contra-Rotating Propulsion System in Hovering},
	  author    = {Chao. Huo and  Roger. Barènes and  Jérémie. Gressier and  Gilles.Grondin},
	  country	= {},
	  institution	= {},
	  abstract     = {The parametrical study of Shrouded Contra-rotating
Rotor was done in this paper based on 2D axisymmetric simulations.
The calculations were made with an actuator disk as double rotor
model. It objects to explore and quantify the effects of different shroud
geometry parameters mainly using the performance of power loading
(PL), which could evaluate the whole propulsion system capability as
5 Newtontotal thrust generationfor hover demand. The numerical
results show that:The increase of nozzle radius is desired but limited
by the flow separation, its optimal design is around 1.15 times rotor
radius, the viscosity effects greatly constraint the influence of nozzle
shape, the divergent angle around 10.5° performs best for chosen
nozzle length;The parameters of inlet such as leading edge curvature,
radius and internal shape do not affect thrust great but play an
important role in pressure distribution which could produce most part
of shroud thrust, they should be chosen according to the reduction of
adverse pressure gradients to reduce the risk of boundary separation.},
	    journal   = {International Journal of Physical and Mathematical Sciences},
	  volume    = {5},
	  number    = {11},
	  year      = {2011},
	  pages     = {1760 - 1769},
	  ee        = {https://publications.waset.org/pdf/6695},
	  url   	= {https://publications.waset.org/vol/59},
	  bibsource = {https://publications.waset.org/},
	  issn  	= {eISSN: 1307-6892},
	  publisher = {World Academy of Science, Engineering and Technology},
	  index 	= {Open Science Index 59, 2011},
	}