Study of spiral path angle in pressure-swirl atomizer with spiral path
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T E C H N I C A L N OT E S
Kiumars Khani Aminjan · Milad Heidari · Pooyan Rahmanivahid
Study of spiral path angle in pressure-swirl atomizer with spiral path
Received: 12 May 2020 / Accepted: 29 September 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The purpose of this study was to investigate the effect of the number of spiral paths on the spray cone angle, discharge coefficient and droplet diameter in pressure-swirl atomizer with spiral paths using numerical and experimental methods. Initially, the injector was designed and manufactured based on some assumptions such as operating fluid type, pressure difference, spray cone angle and mass flow rate and then tested. Comparison of test results with design assumptions showed that mass flow rate and spray cone angle and discharge coefficient were 5%, 13.25% and 4% error, respectively. Then, numerical solution method was used for numerical investigation of the influence of geometric parameters. To simulate the two-phase flow, the fluid volume fraction model was used. The numerical solution of mass flow rate and spray cone angle and discharge coefficient showed 7.4%, 9.5% and 11.76% error, respectively. The results showed that the pressure-swirl atomizer with spiral paths has a conical shape and is hollow. Also, the total velocity and its components on the edge of the spray cone have the highest value. Investigations showed that at constant mass flow rate with increasing the torsion of spiral path, the total radial, axial and tangential velocities increased, which increased the spray cone angle and decreased the droplet diameter. Keywords Pressure-swirl atomizer · Spiral path · Injector design · Spray cone angle · Droplets diameter · VOF
List of symbols d1 d2 Kv α Cd G V P ν t
Average diameter of the droplets in the first phase of defeat the droplets Average diameter of the droplets in the second phase of defeat the droplets Speed coefficient Spray cone angle Discharge coefficient Mass flow rate velocity Pressure Kinematic viscosity The thickness of the film
K. K. Aminjan Faculty of Aerospace Engineering, Malek Ashtar University of Technology, Tehran, Iran M. Heidari (B) · P. Rahmanivahid Mechanical Engineering and Vehicle Technology Department, Global College of Engineering and Technology (GCET), CPO Ruwi 112, P.O. Box 2546, Muscat, Oman E-mail: [email protected]
K. K. Aminjan et al.
Ds Ls Lo Do Ain
The diameter of the swirl chamber The length of the swirl chamber The length of orefis The diameter of orefis Spiral paths area
1 Introduction Pressure-swirl injectors are widely used in combustion chambers and various engineering applications. The main advantages of these injectors include the ability to create a uniform spraying angle with the desired spray angle, better atomization of the fluid droplets and a convenient mixing of the fuel and oxidizer in the chamber. These properties improve combustion quality and reduce combustion instability. Generally, a pressure-swirl injector consists of three main parts: tangential inlet, s
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