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http://dx.doi.org/10.3795/KSME-B.2014.38.4.321

Performance Characteristics Under Non-Reacting Condition with Respect to Length of a Subscale Diffuser for High-Altitude Simulation  

Jeong, Bonggoo (Dept. of Mechanical Engineering, Chungnam Nat'l Univ.)
Kim, Hong Jip (Dept. of Mechanical Engineering, Chungnam Nat'l Univ.)
Jeon, Junsu (Dept. of Aerospace Engineering, Chungnam Nat'l Univ.)
Ko, Youngsung (Dept. of Aerospace Engineering, Chungnam Nat'l Univ.)
Han, Yeoung-Min (Propulsion Test Team, Korea Aerospace Research Institute)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.38, no.4, 2014 , pp. 321-328 More about this Journal
Abstract
The performance characteristics of a subscale diffuser under non-reacting conditions for high-altitude simulation were numerically investigated with respect to different lengths of the secondary throat diffuser. The ratio of the length of the diffuser entrance to the nozzle exit diameter was set to 0, 50, and 100%. In addition, flow characteristics were studied for a range of length-to-diameter ratios of the secondary throat diffuser. An insufficient diffuser entrance length caused contraction of the plume immediately after the nozzle exit. When the length-to-diameter ratio was less than 8, a strong Mach disk was formed inside the diffuser, resulting in a sharp increase in pressure. In addition, flow characteristics in the diverging part of the diffuser were investigated for a range of diverging part lengths. A short diverging part may lead to abrupt pressure recovery, resulting in the possible application of mechanical load to the diffuser.
Keywords
Subscale Diffuser; Diffuser Entrance Length; High-Altitude; Plume; Shock Train; Second Throat Exhaust Diffuser (STED); Normal Shock;
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Times Cited By KSCI : 1  (Citation Analysis)
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