Development of a Flow Visualization Borescope and a Two-Phase Flow Probe for Aeroengine Transmission Gears

2019 ◽  
Author(s):  
Hidenori Arisawa ◽  
Yuji Shinoda ◽  
Yoshiyuki Noguchi ◽  
Tatsuhiko Goi ◽  
Takahiko Banno ◽  
...  
Keyword(s):  
Flow Visualization ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Flow Probe ◽  
Two Phase

Developments of a Flow Visualization Borescope and a Two-Phase Flow Probe for Aeroengine Transmission Gears

2018 ◽  
Author(s):  
Hidenori Arisawa ◽  
Yuji Shinoda ◽  
Yoshiyuki Noguchi ◽  
Tatsuhiko Goi ◽  
Takahiko Banno ◽  
...  
Keyword(s):  
Flow Visualization ◽  
Flow Velocity ◽  
Two Phase Flow ◽  
High Speed Photography ◽  
Phase Flow ◽  
Flow Probe ◽  
Two Phase ◽  
Peripheral Speed ◽  
Diameter Pipe ◽  
Oil Flow

In order to reduce oil dynamic power loss in aeroengine gearboxes, visualizations and measurements of the oil-flow are effective. In the research presented in this paper, we developed a flow visualization borescope which can qualitatively visualize oil flow and a two-phase flow probe which can quantitatively measure oil/air ratio and the flow velocity. The flow visualization borescope consists of a 16mm diameter pipe in which an air purge passage for removing oil mist and a borescope are integrated with an illumination laser light and optical lenses, enabling clear high-speed photography. The two-phase probe consists of a 5mm diameter pipe with a 1mm diameter measurement hole and has a pressure adjustment pipe inside the pipe. For a demonstration, a shrouded spur gear with 100 m/s peripheral speed and 20 liters/min oil supply was used. Flow visualization at 30000 frame/sec imaging shows that oil outflow from the shroud opening spreads turbulently over the whole width of the opening. Oil/air ratio and flow velocity measurement by the two-phase flow probe show that there was thin oil-rich layer on the shroud wall and the flow speed was slow compared with the gear peripheral speed. The measurement equipment we developed was easily installed to the gearbox and therefore it is expected to apply to real aeroengine gearboxes.

Experimental Characterization of Oil-Refrigerant Two-Phase Flow

2000 ◽  
Author(s):  
V. T. Lacerda ◽  
A. T. Prata ◽  
F. Fagotti
Keyword(s):  
Flow Visualization ◽  
Two Phase Flow ◽  
Working Fluid ◽  
Phase Flow ◽  
Oil Viscosity ◽  
Two Phase ◽  
Mixture Flow ◽  
Horizontal Tubes ◽  
Constant Diameter ◽  
Oil Flow

Abstract Several phenomena occurring inside refrigerating systems depend on the interaction between the refrigeration oil and the refrigerant working fluid. Regarding the refrigeration cycle, good miscibility of oil and refrigerant assure easy return of circulating oil to the compressor through the reduction of the oil viscosity. Inside the compressor the lubricant is mainly used for leakage sealing, cooling of hot elements and lubrication of sliding parts. In the compressor bearing systems the presence of refrigerant dissolved in the oil greatly influences the performance and reliability of the compressor due to the outgassing experienced by sudden changes in temperature and pressure resulting in a two-phase mixture with density and viscosity strongly affecting the lubricant characteristics. A general understanding of the oil-refrigerant mixture flow is crucial in developing lubrication models to be used in analysis and simulation of fluid mechanics problems inside the compressor. In the present investigation the refrigeration oil flow with refrigerant outgassing is explored experimentally. A mixture of oil saturated with refrigerant is forced to flow in two straight horizontal tubes of constant diameter. One tube is used for flow visualization and the other is instrumented for pressure and temperature measurements. At the tubes inlet liquid state prevails and as flow proceeds the pressure drop reduces the gas solubility in the oil and outgassing occurs. Initially small bubbles are observed and eventually the bubble population reaches a stage where foaming flow is observed. The flow visualization allowed identification of the two-phase flow regimes experienced by the mixture. Pressure and temperature distributions are measured along the flow and from that mixture quality and void fraction were estimated.

scholarly journals Two-Phase Flow Visualization in the throttle of expansion valve

2007 ◽  
Vol 27 (Supplement1) ◽  
pp. 123-124
Author(s):  
Kazuhiko MATSUMURA ◽  
Yasuhiko FUJII ◽  
Shigeo KIMURA ◽  
Takahiro KIWATA
Keyword(s):  
Flow Visualization ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Expansion Valve

Capacitive direct-imaging sensor for two-phase flow visualization

2016 ◽  
Author(s):  
Aluisio do N. Wrasse ◽  
Tiago P. Vendruscolo ◽  
Eduardo N. Santos ◽  
Fernando C. Castaldo ◽  
Rigoberto E. M. Morales ◽  
...  
Keyword(s):  
Flow Visualization ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Direct Imaging ◽  
Two Phase ◽  
Imaging Sensor

A breadboard flight experiment for two-phase flow visualization in microgravity

1995 ◽  
Author(s):  
Steve Benner ◽  
Gerard Durback ◽  
Kimberly Kolos ◽  
Robert Bayt
Keyword(s):  
Flow Visualization ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Flight Experiment
Sign in / Sign up

Export Citation Format

Share Document