Numerical Simulation on the Ventilation Cooling Performance of the Engine Nacelle under Hover and Forward Flight Conditions

2011 ◽  
Vol 4 (1) ◽  
pp. 732-742 ◽  
Author(s):  
Yongqi Xie ◽  
Hongxia Gao ◽  
Jianzu Yu ◽  
Jing Xiao
Keyword(s):  
Numerical Simulation ◽  
Forward Flight ◽  
Cooling Performance ◽  
Engine Nacelle

Experimental and Numerical Evaluation of Small-Scale Cryosurgery Using Ultrafine Cryoprobe

2013 ◽  
Vol 4 (4) ◽  
Author(s):  
Junnosuke Okajima ◽  
Atsuki Komiya ◽  
Shigenao Maruyama
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Heat Transfer Coefficient ◽  
Temperature Distribution ◽  
Surface Temperature ◽  
Numerical Evaluation ◽  
Small Scale ◽  
Outer Diameter ◽  
Cooling Performance ◽  
The Heat Transfer Coefficient

The objective of this work is to experimentally and numerically evaluate small-scale cryosurgery using an ultrafine cryoprobe. The outer diameter (OD) of the cryoprobe was 550 μm. The cooling performance of the cryoprobe was tested with a freezing experiment using hydrogel at 37 °C. As a result of 1 min of cooling, the surface temperature of the cryoprobe reached −35 °C and the radius of the frozen region was 2 mm. To evaluate the temperature distribution, a numerical simulation was conducted. The temperature distribution in the frozen region and the heat transfer coefficient was discussed.

scholarly journals Numerical Simulation of Rotor in Hover and Forward Flight

2018 ◽  
Vol 179 ◽  
pp. 03011
Author(s):  
Qinghe Zhao
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Flow Field ◽  
Moving Grid ◽  
Steady State Flow ◽  
Forward Flight ◽  
Numerical Simulation Result ◽  
Structured Grid ◽  
Pressure Distributions ◽  
Good Agreement

The flow around rotor is numerical simulated in hover and forward flight based on multi-structured grid. In hover the flow field can be transformed into a steady-state flow field in the rotating coordinate system. The experimental data of Caradonna and Tung rotor is used to verify the numerical simulation result. The numerical results compare well with the experimental data for both non-lifting and lifting cases. Non-lifting forward flight is simulated and the prediction capabilities have been validated through the ONERA two-blade rotor. The pressure distributions of different positions under different azimuth angles are compared, which is in good agreement with the experimental data. There is unsteady shock wave when forward flight. Dual-time method is used to obtain unsteady flow field with rigid moving grid in the inertial system.

Three-Dimensional Numerical Simulation of Hummingbird Forward Flight

2016 ◽  
Author(s):  
Jialei Song ◽  
Haoxiang Luo ◽  
Bret Tobalske ◽  
Tyson Hedrick
Keyword(s):  
Numerical Simulation ◽  
Three Dimensional ◽  
Forward Flight

Numerical Simulation of Autorotation in Forward Flight

2009 ◽  
Vol 46 (5) ◽  
pp. 1642-1648 ◽  
Author(s):  
Hak Yoon Kim ◽  
Dong Jin Sheen ◽  
Seung O. Park
Keyword(s):  
Numerical Simulation ◽  
Forward Flight
Sign in / Sign up

Export Citation Format

Share Document