Study of Gas-Centered Coaxial Injector
Using Jet in a Cross-Flow Mechanism
K. R. Arun
Abstract For the design of liquid propellant rocket engine, the finalization of the
main injection scheme/pattern is an important factor. For controlling combustion
and engine performance the design of injector geometry is most important. In airbreathing engines and liquid rocket engines, proper atomization and mixing of fuel
are required for fuel prior to burning. An injector having configuration conforming
to liquid jet in cross-flow (JICF) can be used in air-breathing engines using liquid
fuels. In this work, atomization studies using Malvern Particle Analyzer conducted
for gas-centered coaxial injectors using jet in cross-flow scheme. Water and gaseous
nitrogen (GN2) were used as simulant fluids. Sauter Mean Diameter (SMD) and
drop size distribution were measured for various momentum flux ratio (MFR) and
at different downstream positions.
Keywords Gas-centered coaxial injector · Momentum flux ratio · Sauter mean
diameter
Nomenclature
MFR Momentum Flux Ratio (ρ j V J
2 /ρ g Vg
2)
d g
Center post diameter
L in
Total Injector length
ρ j
Density of liquid jet
ρ g
Density of gas
V j
Velocity of liquid jet
V g
Velocity of gas
l
Liquid orifice length
j
Liquid jet
K. R. Arun (B)
Viswajyothi College of Engineering and Technology, Vazhakulam, Ernakulam, India
e-mail: arunkr@vjcet.org
© 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_40
367
Using Jet in a Cross-Flow Mechanism
K. R. Arun
Abstract For the design of liquid propellant rocket engine, the finalization of the
main injection scheme/pattern is an important factor. For controlling combustion
and engine performance the design of injector geometry is most important. In airbreathing engines and liquid rocket engines, proper atomization and mixing of fuel
are required for fuel prior to burning. An injector having configuration conforming
to liquid jet in cross-flow (JICF) can be used in air-breathing engines using liquid
fuels. In this work, atomization studies using Malvern Particle Analyzer conducted
for gas-centered coaxial injectors using jet in cross-flow scheme. Water and gaseous
nitrogen (GN2) were used as simulant fluids. Sauter Mean Diameter (SMD) and
drop size distribution were measured for various momentum flux ratio (MFR) and
at different downstream positions.
Keywords Gas-centered coaxial injector · Momentum flux ratio · Sauter mean
diameter
Nomenclature
MFR Momentum Flux Ratio (ρ j V J
2 /ρ g Vg
2)
d g
Center post diameter
L in
Total Injector length
ρ j
Density of liquid jet
ρ g
Density of gas
V j
Velocity of liquid jet
V g
Velocity of gas
l
Liquid orifice length
j
Liquid jet
K. R. Arun (B)
Viswajyothi College of Engineering and Technology, Vazhakulam, Ernakulam, India
e-mail: arunkr@vjcet.org
© 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_40
367