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http://dx.doi.org/10.6108/KSPE.2016.20.4.068

Spray Characteristics of Swirl-coaxial Injector According to the Recess Length and Injection Pressure Variation  

Bae, Seong Hun (Department of Mechanical Engineering, Pukyong National University)
Kwon, Oh Chae (School of Mechanical Engineering, Sungkyunkwan University)
Kim, Jeong Soo (Department of Mechanical Engineering, Pukyong National University)
Publication Information
Journal of the Korean Society of Propulsion Engineers / v.20, no.4, 2016 , pp. 68-76 More about this Journal
Abstract
This research is carried out for the performance evaluation of the injector that is one of the critical components of bipropellant-rocket-engine. Spray characteristics are investigated in detail according to the recess length and injection pressure on the swirl-coaxial-injector using gaseous methane and liquid oxygen as propellants. A visualization is conducted by the Schlieren photography that is composed of a light source, concave mirrors, knife, and high-speed-camera. A hollow-cone-shape is identified in the liquid spray that is spread only by inner injector and the spray angle is decreased due to the diminution of swirl strength in accordance with the increase of the length of injector orifice. When the injector sprays the liquid through the inner injector with the aid of gas through the outer injector, the spray angle in external mixing region tends to increase with rise of the recess length, while in internal mixing region, it is decreased. It is also confirmed that the same tendency of the spray angle with recess length appears irrespective of the injection pressure of liquid spray.
Keywords
Bipropellant; Swirl Coaxial Injector; Cold Flow Test; Spray Angle; Breakup Length;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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