Effect of Number of Inlet Tangential
Ports and Their Angle on Spray
Characteristics of Plug Type Swirl
Injector
Sri Nithya Mahottamananda, D. N. Dilli Babu, and P. N. Kadiresh
Abstract Fuel atomization is a critical process. Swirl injector is used in gas turbine
combustion chamber, rocket thrust chamber and hybrid rocket motor, etc., because
of its efficient atomization process. This paper focuses on an experimental study on
spray characteristics of plug type swirl injector using three injector configurations
namely SW1, SW2, and SW3. The objective of the study is to analyze the spray characteristics like liquid sheet break up length, spray cone angle, discharge coefficient,
and volumetric flow of plug type swirl injector for three chosen configurations. The
injection pressure got varied from 1 to 2 bars and water was used as working fluid.
The experimental data shows that for all injection pressures, SW1 configuration gives
43–49% lesser breakup length, 39–51% higher spray cone angle, lesser discharge
coefficient, and 1–6% lesser volume flow rate compared to SW3 injector. It is also
observed that SW1 configuration gives 7–11% lesser breakup length, 1–3% higher
spray cone angle, 1–2% lesser discharge coefficient, and 3–6% lesser volume flow
rate compared to SW2 configuration. The observed results of lesser breakup length
and spray cone angle make the plug type swirl injector of SW1 configuration best
suited for the short combustor.
Keywords Plug type swirl injector · Swirl cone angle · Break up length · Number
of inlet tangential port effect · Inlet port tangential angle effect
Nomenclature
L b Liquid sheet break up length
L
Break up length of liquid sheet along streamwise direction
S. N. Mahottamananda (B) · D. N. Dilli Babu · P. N. Kadiresh
Department
of Aerospace Engineering, B.S. Abdur Rahman Crescent Institute of Science & Technology,
Chennai, India
e-mail: mahottamananda@gmail.com
© 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_15
139
Ports and Their Angle on Spray
Characteristics of Plug Type Swirl
Injector
Sri Nithya Mahottamananda, D. N. Dilli Babu, and P. N. Kadiresh
Abstract Fuel atomization is a critical process. Swirl injector is used in gas turbine
combustion chamber, rocket thrust chamber and hybrid rocket motor, etc., because
of its efficient atomization process. This paper focuses on an experimental study on
spray characteristics of plug type swirl injector using three injector configurations
namely SW1, SW2, and SW3. The objective of the study is to analyze the spray characteristics like liquid sheet break up length, spray cone angle, discharge coefficient,
and volumetric flow of plug type swirl injector for three chosen configurations. The
injection pressure got varied from 1 to 2 bars and water was used as working fluid.
The experimental data shows that for all injection pressures, SW1 configuration gives
43–49% lesser breakup length, 39–51% higher spray cone angle, lesser discharge
coefficient, and 1–6% lesser volume flow rate compared to SW3 injector. It is also
observed that SW1 configuration gives 7–11% lesser breakup length, 1–3% higher
spray cone angle, 1–2% lesser discharge coefficient, and 3–6% lesser volume flow
rate compared to SW2 configuration. The observed results of lesser breakup length
and spray cone angle make the plug type swirl injector of SW1 configuration best
suited for the short combustor.
Keywords Plug type swirl injector · Swirl cone angle · Break up length · Number
of inlet tangential port effect · Inlet port tangential angle effect
Nomenclature
L b Liquid sheet break up length
L
Break up length of liquid sheet along streamwise direction
S. N. Mahottamananda (B) · D. N. Dilli Babu · P. N. Kadiresh
Department
of Aerospace Engineering, B.S. Abdur Rahman Crescent Institute of Science & Technology,
Chennai, India
e-mail: mahottamananda@gmail.com
© 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_15
139