Global flow visualization of transonic cavity flow with various yaw angles

2021 ◽  
pp. 095441002098408
Author(s):  
Chih-Yung Huang ◽  
Chen-Yen Yeh ◽  
Yun-Fang Lin ◽  
Kung-Ming Chung
Keyword(s):  
Pressure Distribution ◽  
Pressure Rise ◽  
Cavity Flow ◽  
Cavity Flows ◽  
Cavity Model ◽  
Pressure Sensitive Paint ◽  
Global Flow ◽  
Closed Cavity ◽  
Pressure Sensitive ◽  
Gradual Pressure

This study experimentally investigated transonic cavity flows with different length-to-depth ( L/ h) ratios and yaw angles. Two rectangular models with L/ h = 6.14 and 21.5 were examined with yaw angles of 10°, 30°, and 45° under a flow of Mach 0.83. The flow was visualized using pressure-sensitive paint (PSP) to obtain the detailed pressure distribution inside the cavity models. The acquired PSP data were compared with experimental data measured using Kulite transducers, and these data showed favorable agreement. Gradual pressure increases inside the cavity model with L/ h = 6.14 were observed from the PSP measurements as open cavity flow. The flow impingement at the bottom of the cavity and the significant pressure rise inside the cavity model with L/ h = 21.5 were observed as closed cavity flow. The present study quantitatively visualized the evolution of the pressure distribution from symmetric to asymmetric for different yaw angles using porous PSP sensors.

Characterising low-speed, transitional cavity flow

2012 ◽  
Vol 116 (1185) ◽  
pp. 1185-1199 ◽  
Author(s):  
Y. T. Ng
Keyword(s):  
Pressure Distribution ◽  
Static Pressure ◽  
Fluid Dynamic ◽  
Flow Regimes ◽  
Cavity Flow ◽  
Flow Visualisation ◽  
Cavity Flows ◽  
Pressure Measurements ◽  
Closed Cavity ◽  
Fluctuating Pressure

In various studies involving subsonic transition cavity flows, terms like ‘transitional-open’ and ‘transitional-closed’ cavity flow regimes are used in the literature. However, the exact fluid dynamic criteria to distinguish them have not been firmly established. The present work attempts to clarify this. Experiments to measure static pressure and fluctuating pressure distribution in a rectangular cavity with length-to-depth (L/D) ratio of 3 to 20 were performed. Based on pressure measurements on the front, bottom and rear faces of the cavity, additional criteria are established to clearly distinguish the range of criticalL/D(or (L/D)cri) where these different transitional cavity flow regimes occur. The present work ascertains that the (L/D)crifor open and transitional-open cavity flow is 6·0-6·5, for transitional-open and transitional-closed cavity flow is 9-10 and for transitional-closed and closed cavity flow is 14-15. Flow visualisation qualitatively supports the flow pattern in the different cavity flow regimes.

Investigation of Cavity Flow Using Fast-Response Pressure-Sensitive Paint

AIAA Journal ◽  
2014 ◽  
Vol 52 (11) ◽  
pp. 2462-2470 ◽  
Author(s):  
W. Flaherty ◽  
Todd M. Reedy ◽  
Gregory S. Elliott ◽  
J. M. Austin ◽  
Ryan F. Schmit ◽  
...  
Keyword(s):  
Cavity Flow ◽  
Fast Response ◽  
Pressure Sensitive Paint ◽  
Pressure Sensitive ◽  
Response Pressure
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