NDLI: Acoustic damping of gas-liquid scheme injectors with a recess in a subscale combustor

Content Provider	Springer Nature Link
Author	Kim, Soo Ho Kim, Young Jun Sohn, Chae Hoon
Copyright Year	2014
Abstract	Acoustic damping induced by a gas-liquid scheme injector is investigated numerically for acoustic stability by adopting an acoustic analysis. The injector consists of four parts of a main cylindrical passage, an inlet blockage, an induction bulge, and a recess at the injector outlet. Purely acoustic behavior in the combustor with a single injector is investigated for acoustic tuning of the injector and the effect of each part of the injector on acoustic damping is studied for high-temperature condition. Sinusoidal and short impulse acoustic oscillations are excited. Damping capacity of the injector is evaluated by the quantitative parameter of damping factor. From the numerical results, it is found that each injector has its own tuning length for maximum damping. An induction bulge and a recess deform the wave-form inside the injector appreciably near the inlet and the outlet, respectively. The deformation of a half-wave form makes the tuning length longer. All the wave-forms inside the optimally tuned injectors show similar forms to that of a half-wave. All the injectors have the same damping mechanism as that of a half-wave resonator. The smaller the amplitude level of the wave is at the injector outlet, the larger damping is induced by the injector. As a recess increases, both the optimal tuning length and the maximum damping factor increase. For application of the injector to an actual combustor, the optimal tuning length needs to be corrected considering high-speed flow inside the injector and high-temperature field in a chamber.
Starting Page	3813
Ending Page	3823
Page Count	11
File Format	PDF
ISSN	1738494X
Journal	Journal of Mechanical Science and Technology
Volume Number	28
Issue Number	9
e-ISSN	19763824
Language	English
Publisher	Korean Society of Mechanical Engineers
Publisher Date	2014-09-20
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Acoustic stability Gas-liquid scheme injector Acoustic analysis Acoustic tuning Recess Mechanical Engineering Vibration, Dynamical Systems, Control Industrial and Production Engineering
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Mechanical Engineering

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