Shock-Wave Structure of Supersonic Jet Flows

Abstract

In the present paper, we give a brief overview of the studies of supersonic jet flows which were performed recently with the aim of gaining experimental data on the formation of the shock-wave structure and jet mixing layer in such flows. Considerable attention is paid to a detailed description of discharge conditions for supersonic jets, to enable the use of measured data for making a comparison with numerical calculations. Data on the 3D flow structure in the mixing layer of the initial length of a supersonic jet are reported. Scientific interest in this phenomenon is due to its practical significance in studying the possibility of intensifying the mixing process as well as in studying the sound-generation process.

Primary breakup study of sonic & supersonic air-assist atomizers

“…The primary breakup mechanism for the two kinds of atomizers tested was conjectured to be different due to the distinct jet characteristics. In the converging nozzle, an underexpansion flow pattern is shown in Figure 2, which results in the Prandtl-Meyer expansion waves [14] may try to deflect the liquid sheet in and out of the centerline, thus delaying the sheet contraction effect (due to the surface tension) even at low liquid flow rates. Besides, it prompts annular sheet to form instability waves on the inner side which gradually does sheet thinning at the wave trough, through which half waves are torn off through liquid sheet (like planar) when wave amplitude reaches a critical threshold forming ligaments, which further disrupts to form large globules/droplets depending on the aerodynamic interaction between high-speed jet air and ligaments.…”

Airworthiness and Conceptual Design Optimization Considerations of the Environmental Impact Assessment of a Supersonic Business Jet Aircraft

“…One of the most significant environmental concerns of the SSBJ design is the aerodynamic noise produced by the shock waves [16]. NASA has been conducting research in this subject to create a low boom design.…”

Airworthiness and Conceptual Design Optimization Considerations of the Environmental Impact Assessment of a Supersonic Business Jet Aircraft

“…One of the most important environmental concerns of the SSBJ operation is the aerodynamic noise generated by the shock waves [16]. NASA is conducting research in this field in order to create a low boom design, which could be quiet enough to overcome the applied restrictions.…”