Shock Motion and Flow Structure of an Underexpanded Jet in the Helical Mode

AIAA Journal ◽  
2019 ◽  
Vol 57 (9) ◽  
pp. 3943-3953 ◽  
Author(s):  
Xiangru Li ◽  
Feng He ◽  
Xiwen Zhang ◽  
Pengfei Hao ◽  
Zhaohui Yao
Keyword(s):  
Flow Structure ◽  
Underexpanded Jet ◽  
Shock Motion ◽  
Helical Mode

Flow Stucture of Supersonic Underexpanded Jet With Microjets Injection

2013 ◽  
Vol 8 (1) ◽  
pp. 44-55
Author(s):  
Dmitriy Gubanov ◽  
Valeriy Zapryagaev ◽  
Nikolay Kiselev
Keyword(s):  
Flow Structure ◽  
Numerical Study ◽  
Mixing Layer ◽  
Supersonic Jet ◽  
Wave Structure ◽  
Streamwise Vortices ◽  
Jet Mixing ◽  
Underexpanded Jet ◽  
Supersonic Underexpanded Jet ◽  
The Impact

Experimental and numerical study of transversal microjets injection influence on the supersonic underexpanded jet flow structure has been performed. Data of measurements and calculation have acceptable agreement. Interaction of microjets with main supersonic jet sets to a decrease of an initial gasdynamic region. Microjets lead to a longitudinal streamwise vortices generation and a mushroom-like flow structures create on an external jet mixing layer. Dissipation of longitudinal streamwise vortices was observed at the second jet cell. Complex gasdynamic flow structure of the supersonic underexpanded jet interacting with supersonic microjets has been studied for the first time. This structure contains system of complex chock waves and expansion waves spreading from the position of the impact microjets/main jet localization place. Future of interaction process a chock-wave structure of main jet with additional shock waves has been studied

On the Sound Sources of the Screech Tone Radiated From Circular Underexpanded Jet Oscillating in the Helical Mode

2003 ◽  
Author(s):  
Yoshikuni Umeda ◽  
Ryuji Ishii
Keyword(s):  
Wave Front ◽  
Vortical Structure ◽  
Oscillation Mode ◽  
Shock Cell ◽  
Sound Sources ◽  
Screech Tone ◽  
Underexpanded Jet ◽  
Mach Cones ◽  
Helical Mode ◽  
Jet Axis

The generation mechanism of the screech tone in the helical oscillation mode is investigated using a series of instantaneous photographs. From the photographs, six evanescent sound sources are observed as prominent points along the jet axis. These sound sources move along circular orbits in the planes perpendicular to the jet axis and slightly downstream of the rear edges of each shock cell. The speed of moving sound sources is supersonic and moving Mach cones generated behind the moving sound sources form helical-shaped wave front of the screech tone. Existence of the moving Mach cones about the jet axis was confirmed by comparing schlieren photographs and drawings of the envelopes of the moving Mach cones. The helical vortical structure appears to overlap on the envelopes of the moving Mach cones.

FLOW STRUCTURE AND HEAT TRANSFER IN MULTIPLE IMPINGING JETS

2016 ◽  
Vol 47 (4) ◽  
pp. 359-382 ◽  
Author(s):  
Nabil Kharoua ◽  
Lyes Khezzar ◽  
Zoubir Nemouchi
Keyword(s):  
Heat Transfer ◽  
Flow Structure ◽  
Impinging Jets
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