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http://dx.doi.org/10.6108/KSPE.2017.21.3.068

Numerical Study on Transition Characteristics of Dual Bell Nozzle with Expansion Ratio Fixed  

Choi, Junsub (Department of Aerospace Engineering, Graduate School at Chungnam National University)
Huh, Hwanil (Department of Aerospace Engineering, Chungnam National University)
Publication Information
Journal of the Korean Society of Propulsion Engineers / v.21, no.3, 2017 , pp. 68-75 More about this Journal
Abstract
Dual bell nozzle is a type of altitude compensation nozzle, which is a nozzle that minimize the losses of the specific impulse at the off-design point of a typical bell nozzle. In this paper, numerical computations are performed to understand the transition characteristics of dual bell nozzles with fixed expansion ratios. The major design variables are the length of extension and the angle of inflection. As the length of the extension increased, the transition altitude and transition duration increased and the reduction of the thrust coefficient decreased. As the angle of inflection increased, the transition altitude and transition duration decreased and the reduction of the thrust coefficient increased.
Keywords
Dual Bell Nozzle; Transition Characteristics; Altitude Compensation; Extension; Inflection Angle;
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Times Cited By KSCI : 5  (Citation Analysis)
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