Measurements of Distributed Combustion,
BRIGHAM YOUNG UNIV PROVO UT
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The problem of combustion instability in solid rocket propellants has been studied extensively over the past three decades. The most common way oscillatory combustion is controlled in rocket motors today is through the use of additives known as acoustic suppressants. The perfect suppressant would control all of the oscillatory modes which are present in a solid propellant rocket motor. Unfortunately suppressants that work well at one frequency, such as the product in a longitudinal mode, can be quite ineffective at other frequencies, such as tangential mode. Still, some suppressants have been relatively successful in suppressing oscillations in operational motors, the more successful suppressants include Al, ZrC and graphite.