Near acoustic field and shock structure of rectangular supersonic jets

AIAA Journal ◽  
1990 ◽  
Vol 28 (7) ◽  
pp. 1163-1170 ◽  
Author(s):  
E. Gutmark ◽  
K. C. Schadow ◽  
C. J. Bicker
Keyword(s):  
Acoustic Field ◽  
Supersonic Jets ◽  
Shock Structure

Effect of Mach number on the acoustic field of 2:1 elliptic-slot jet

2001 ◽  
Vol 105 (1043) ◽  
pp. 9-16 ◽  
Author(s):  
S. B. Verma ◽  
E. Rathakrishnan
Keyword(s):  
Mach Number ◽  
Fundamental Frequency ◽  
Acoustic Field ◽  
Major Axis ◽  
Shock Structure ◽  
Minor Axis ◽  
Noise Levels ◽  
Underexpanded Jets ◽  
Barrel Shock ◽  
Mach Numbers

Abstract The shock-structure and the related acoustic field of underexpanded jets undergoes significant changes as the Mach number Mj is increased. The present investigation is carried out to study the effect of Mach number on an underexpanded 2:1 elliptic-slot jet. Experimental data are presented for fully expanded Mach numbers ranging from 1.3 to 2.0. It is observed that the ‘cross-over’ point at the end of the first cell at low Mach numbers gets replaced by a normal shock at a highly underexpanded condition resulting in the formation of a ‘barrel’ shock along the minor-axis side with a ‘bulb’ shock formed along the major-axis side. The above change in shock structure is accompanied by a related change in the acoustic field. The amplitude of fundamental frequency along the minor-axis side grows with Mj but falls beyond Mj = 1.75. Along the major-axis side, however, the fundamental frequency does not exist at low Mach numbers. It appears at Mj = 1.75 but then falls at Mj = 2.0. The related azimuthal directivity of overall noise levels (OASPL) shows significant changes with Mj.

Numerical investigation of the bevelled effects on shock structure and screech noise in planar supersonic jets

2020 ◽  
Vol 32 (8) ◽  
pp. 086103 ◽  
Author(s):  
Chuang-Chao Ye ◽  
Peng-Jun-Yi Zhang ◽  
Zhen-Hua Wan ◽  
De-Jun Sun ◽  
Xi-Yun Lu
Keyword(s):  
Numerical Investigation ◽  
Supersonic Jets ◽  
Shock Structure
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