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http://dx.doi.org/10.5139/JKSAS.2010.38.5.456

The Characteristics of DC-shift in Hybrid Rocket  

Kang, Dong-Hoon (건국대학교 항공우주정보시스템 공학과 대학원)
Lee, Chang-Jin (건국대학교 항공우주정보시스템 공학과)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.38, no.5, 2010 , pp. 456-466 More about this Journal
Abstract
Typical combustion instability such as DC-Shift found in the hybrid rocket motor is characterized by non-linearity. DC-Shift can occur in two different realizations. One is so-called a positive shift of measured DC voltage where the pressure increase suddenly. The other is a negative shift where the pressure drops abruptly. In the present work, specifically the negative DC-Shift was investigated to analyze the effect of oxidizer flow condition and the resonance between fundamental frequency and other ones, such as Helmholtz frequency, and acoustic frequency. Results show a peak frequency of several hundreds HZ shifts as combustion proceeds. A negative DC-shift was found as the result of phase cancellation between two dominant frequency, combustion frequency and flow related frequency. Still is it required to study further to identify the change of dominance of frequency during the combustion.
Keywords
DC-shift; Hybrid Rocket; Combustion Instability; Acoustic mode; Vortex shedding frequency;
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Times Cited By KSCI : 1  (Citation Analysis)
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