Browse > Article
http://dx.doi.org/10.6108/KSPE.2013.17.5.001

A Numerical Study on Effects of Displacement of a Variable Area Nozzle on Flow and Thrust in a Jet Engine  

Park, Junho (School of Mechanical and Aerospace Engineering, Sejong University)
Sohn, Chae Hoon (School of Mechanical and Aerospace Engineering, Sejong University)
Park, Dong Chang (The 1st Research and Development Institute, Agency for Defense Development)
Publication Information
Journal of the Korean Society of Propulsion Engineers / v.17, no.5, 2013 , pp. 1-9 More about this Journal
Abstract
Variable area nozzle, where both throat and exit area vary, is required for optimal expansion and optimal nozzle shape upon operation of after-burner. Steady-state and transient analyses are carried out for each condition with and without afterburner operation and as a function of the location of the nozzle flap. Effects of that nozzle displacement on flow and thrust characteristics are analyzed from numerical results. With variable area nozzle adopted, the combustion field is variable in time, leading to periodically variable thrust. For off-design conditions, flow separation shows up due to over expansion at the flap tips and shock wave does in the nozzle due to under expansion. The undesirable phenomena can be solved by control of variable area nozzle.
Keywords
Variable Area Nozzle; Chemical Equilibrium Analysis; Shock Wave; Flow Separation;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Flack, R.D., Fundamentals of jet propulsion with application, Cambridge University Press, New York, 2005.
2 Wlash, P.P. and Fletcher, P., Gas turbine performance, Blackwell Science, Limited., 2004.
3 Mattingly, J.D., Heiser, W.H.,and Pratt,D.T., Aircraft Engine Design, 2nd ed., AIAA Education Series, New York, 2002.
4 Sutton, G.P., Rocket Propulsion Elements, 6th ed., John Wiley & Sons Inc., New York, U.S.A., 1992.
5 Gordon, S., and McBride, B.J., "Computer Program for Calculation of Complex Chemical Equillibrium Composition and Applications," NASA RP-1311, October 1994.
6 Yu, D.H., Kang, H.S., Choi, S.M., Myong, N.S. and Kim, W.C., "Conceptual Design of an Exhaust Nozzle of an Aircraft Turbofan Engine," The Korean Society of Propulsion Engineers Fall Conference, pp. 158-162, 2012.
7 CFDRC, CFD-ACE-GUI Modules Manual, Vol. 1, Ver. 2013, Huntville, AL, 2013.
8 Park, D.C., Lee, S.Y., Yun, S.J. and Yoon, H.G., "Multi-Body Dynamics Characteristics of Variable Nozzle," The Korean Society of Propulsion Engineers Fall Conference, pp. 711-712, 2010.
9 Oates, G.C., Aircraft Propulsion Systems technology and design, AIAA, 1989.
10 Alford, J.S., Taylor, R.P., "Aerodynamic stability considerations of high-pressure ratio, variable-geometry jet nozzles," Journal of Aircraft, Vol. 2, No. 4, pp. 308-311, 1965.   DOI