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http://dx.doi.org/10.3795/KSME-B.2014.38.4.279

An Experimental Study on Performance of Second Throat Exhaust Diffusers of Different Configuration  

Jeon, Jun Su (Dept. of Aerospace Engineering, Chungnam Nat'l Univ.)
Kim, Wan Chan (Dept. of Aerospace Engineering, Chungnam Nat'l Univ.)
Yeoun, Hae In (Dept. of Aerospace Engineering, Chungnam Nat'l Univ.)
Kim, Min Sang (Dept. of Aerospace Engineering, Chungnam Nat'l Univ.)
Ko, Young Sung (Dept. of Aerospace Engineering, Chungnam Nat'l Univ.)
Han, Young Min (Propulsion Test Team, KARI)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.38, no.4, 2014 , pp. 279-288 More about this Journal
Abstract
Second throat supersonic exhaust diffusers (STEDs) were designed to simulate high-altitude conditions according to the normal-shock model. Experimental studies were performed on the STEDs to investigate how performance characteristics varied with the length and diameter of the STED using high-pressure nitrogen gas. The variation in performance due to length indicated that the performance of the STED could be very slightly improved by adjusting the diffuser inlet length ($L_d$), and it could be significantly improved by optimizing the second throat length ratio ($L_{st}/D_{st}$) and the divergence length ($L_s$). The starting and vacuum chamber pressures exhibited the highest level of performance near ($A_d/A_{st}$) of the design point.
Keywords
Second Throat Exhaust Diffusers(STED); High Altitude Environment Simulation; Vacuum Chamber;
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