Abstract
Experimental Study on the Spray Characteristics of Shear Coaxial/Swirl Coaxial Injectors Manufactured by SLM Process
Highlights
Shear coaxial injectors and swirl coaxial injectors are widely used in liquid rocket engines using a liquid/gas propellant combination
When designing a swirl coaxial injector, it is necessary to consider the self-pulsation phenomenon when determining the recess length. This self-pulsation phenomenon was first discovered by Bazarov in 1976 [5], and in subsequent studies [6], confirmed that the recess length of the injector is an essential parameter of the self-pulsation phenomenon
When checking the single injection results, it is confirmed that the Inj D-12 of the shear coaxial type has the oxidizer inlet hole processed to the center of the injector so that the liquid has only the axial velocity
Summary
Shear coaxial injectors and swirl coaxial injectors are widely used in liquid rocket engines using a liquid/gas propellant combination. The liquid oxidizer is injected in a swirl motion and interacts with the gaseous fuel injected around it [2] These coaxial injectors are significantly affected by atomization and mixing performance according to the injector recess length (LR) [3,4]. When designing a swirl coaxial injector, it is necessary to consider the self-pulsation phenomenon when determining the recess length. Bai et al showed that self-pulsation occurs due to the interaction between gas and liquid at the recess wall of the swirl sprayer. Self-pulsation occurred in the cold-flow test of coaxial injectors designed to apply a 1-ton class methane engine. Such a phenomenon may cause combustion instability during actual combustion and may further damage the engine. This research team experimented in a room pressure environment to investigate the occurrence region of the self-pulsation phenomenon and its characteristics in advance in the experimental stage
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