Numerical Study on Supersonic
Co-flowing Jet with Varying Lip
Thickness
R. Naren Shankar, K. Sathish Kumar, N. Dilip Raja,
Kamal Raj Chandra Shekar, Nishant Kumar Raj, and Dipranjan Gupta
Abstract The study on jet mixing characteristics by varying the lip thickness has
been done by the many researchers in low subsonic, high subsonic, and sonic Mach
numbers (0–1.0). Additionally, researchers have performed supersonic primary jet
surrounded by subsonic and sonic secondary jet. The jet mixing characteristics of a
supersonic primary jet surrounded by a supersonic co-flowing jet with varying lip
thickness have not been performed yet. The present study probes into this numerically. Numerical results were validated with existing experimental results in the
open literature. Centerline pitot pressure is calculated using the Rayleigh pitot tube
formula. Results show that increasing lip thickness enhances mixing and vice versa.
The numerical shadowgraph shows the shock wave propagation and its interaction. Supersonic jet phenomenon such as supersonic core, Mach disk, oblique shock
waves, shock crossover, expansion waves, subsonic flow pockets behind Mach disk,
recirculation zone, near-field turbulence, subatmospheric region (wake), shear layer,
characteristic decay region, fully developed region, and jet interaction was studied.
Keywords Supersonic co-flow · Lip thickness · Mach disk
R. Naren Shankar (B) · N. Dilip Raja · K. R. C. Shekar · N. K. Raj · D. Gupta
Vel Tech Rangarajan Dr. Sagunthala R&D Institute of Science and Technology,
Outer Ring Road, Avadi, Chennai, Tamil Nadu 600062, India
e-mail: narensankar@veltech.edu.in
N. K. Raj
e-mail: vtu8056@veltechuniv.edu.in
K. Sathish Kumar
P.B. College of Engineering, Irungattukottai, Chennai, Tamil Nadu 602117, India
© The Editor(s) (if applicable) and The Author(s), under exclusive license
to Springer Nature Singapore Pte Ltd. 2021
N. Gascoin and E. Balasubramanian (eds.), Innovative Design, Analysis
and Development Practices in Aerospace and Automotive Engineering, Lecture Notes
in Mechanical Engineering, https://doi.org/10.1007/978-981-15-6619-6_37
343
Co-flowing Jet with Varying Lip
Thickness
R. Naren Shankar, K. Sathish Kumar, N. Dilip Raja,
Kamal Raj Chandra Shekar, Nishant Kumar Raj, and Dipranjan Gupta
Abstract The study on jet mixing characteristics by varying the lip thickness has
been done by the many researchers in low subsonic, high subsonic, and sonic Mach
numbers (0–1.0). Additionally, researchers have performed supersonic primary jet
surrounded by subsonic and sonic secondary jet. The jet mixing characteristics of a
supersonic primary jet surrounded by a supersonic co-flowing jet with varying lip
thickness have not been performed yet. The present study probes into this numerically. Numerical results were validated with existing experimental results in the
open literature. Centerline pitot pressure is calculated using the Rayleigh pitot tube
formula. Results show that increasing lip thickness enhances mixing and vice versa.
The numerical shadowgraph shows the shock wave propagation and its interaction. Supersonic jet phenomenon such as supersonic core, Mach disk, oblique shock
waves, shock crossover, expansion waves, subsonic flow pockets behind Mach disk,
recirculation zone, near-field turbulence, subatmospheric region (wake), shear layer,
characteristic decay region, fully developed region, and jet interaction was studied.
Keywords Supersonic co-flow · Lip thickness · Mach disk
R. Naren Shankar (B) · N. Dilip Raja · K. R. C. Shekar · N. K. Raj · D. Gupta
Vel Tech Rangarajan Dr. Sagunthala R&D Institute of Science and Technology,
Outer Ring Road, Avadi, Chennai, Tamil Nadu 600062, India
e-mail: narensankar@veltech.edu.in
N. K. Raj
e-mail: vtu8056@veltechuniv.edu.in
K. Sathish Kumar
P.B. College of Engineering, Irungattukottai, Chennai, Tamil Nadu 602117, India
© The Editor(s) (if applicable) and The Author(s), under exclusive license
to Springer Nature Singapore Pte Ltd. 2021
N. Gascoin and E. Balasubramanian (eds.), Innovative Design, Analysis
and Development Practices in Aerospace and Automotive Engineering, Lecture Notes
in Mechanical Engineering, https://doi.org/10.1007/978-981-15-6619-6_37
343