Low-frequency shock train oscillation control in a constant area duct

2022 ◽  
Vol 34 (1) ◽  
pp. 016105
Author(s):  
Vignesh Ram Petha Sethuraman ◽  
Yosheph Yang ◽  
Jae Gang Kim
Keyword(s):  
Low Frequency ◽  
Shock Train ◽  
Oscillation Control ◽  
Constant Area

Large-Eddy Simulations of a Normal Shock Train in a Constant-Area Isolator

AIAA Journal ◽  
2014 ◽  
Vol 52 (3) ◽  
pp. 539-558 ◽  
Author(s):  
Brandon Morgan ◽  
Karthik Duraisamy ◽  
Sanjiva K. Lele
Keyword(s):  
Large Eddy Simulations ◽  
Normal Shock ◽  
Shock Train ◽  
Constant Area ◽  
Large Eddy

scholarly journals Two-dimensional quantitative visualization of isolator shock trains by rainbow schlieren deflectometry

2018 ◽  
Vol 180 ◽  
pp. 02063
Author(s):  
Atsushi Matsuyama ◽  
Shinichiro Nakao ◽  
Daisuke Ono ◽  
Yoshiaki Miyazato ◽  
Masashi Kashitani
Keyword(s):  
Two Dimensional ◽  
Practical Application ◽  
Shock Train ◽  
Free Jets ◽  
Rainbow Schlieren Deflectometry ◽  
Constant Area ◽  
Displacement Thickness ◽  
Quantitative Visualization ◽  
First Time ◽  
Rainbow Schlieren

The rainbow schlieren deflectometry is effective in studying quantitatively the density fields in shock-containing free jets at high precision and high spatial resolution. However, there has been no practical application of rainbow schlieren deflectometry for shock trains in a confined duct. Therefore, in the present study, the rainbow schlieren deflectometry is applied to the flow field including a shock train in a constant-area duct where just upstream of the shock train the freestream Mach number is 1.34, the unit Reynolds number is 5.39 × 107 m-1, and the boundary layer displacement thickness is 0.149 mm. As a result, a two- dimensional density field of the shock train is for the first time quantitatively displayed and the fine structure of the shock train is illustrated as a color gradation representation.

Analysis and modelling of unsteady shock train motions

2018 ◽  
Vol 846 ◽  
pp. 240-262 ◽  
Author(s):  
Bing Xiong ◽  
Xiao-qiang Fan ◽  
Zhen-guo Wang ◽  
Yuan Tao
Keyword(s):  
High Frequency ◽  
High Speed ◽  
Back Pressure ◽  
Pressure Measurements ◽  
Rectangular Duct ◽  
Shock Train ◽  
Flow Parameters ◽  
Constant Area ◽  
Schlieren Techniques ◽  
Moving Speed

The characteristics and mechanism for unsteady shock train motions were experimentally studied in a constant-area rectangular duct. High-speed Schlieren techniques and high-frequency pressure measurements were utilized in this research. The results show that the shock train undergoes periodical motions in response to downstream periodical excitations. The mechanism for unsteady shock train motions is that the shock train keeps changing its moving speed to change the relative Mach number ahead of shock train to match the varying back-pressure condition. It can be found that the unsteady shock train motion can be predicted well with a theoretical model, which is based on this mechanism. A correlation between the amplitude of shock train motions and some flow parameters was illustrated using an analytical equation, which was confirmed by the experimental results.

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