Effects of baffle on the acoustic mode characteristics of liquid rocket engine combustion chambers
The Helmholtz equation with the mean flow source term was solved by the acoustic finite element method.Then,on the basis of considering the high temperature and average flow field of the combustion chamber,the influence of baffle structure parameters on the acoustic mode characteristics of the liquid rocket engine combustion chamber was analyzed.The results showed that:increasing the number or length of baffle reduced the eigenfrequency of the first-order tangential mode of the combustion chamber;when the number of baffle was 4,the damping rate of the first-order tangential mode of the combustion chamber was greatest;the longer length of the baffle indicated the smaller distribution area of the first-order tangential mode acoustic pressure and the larger damping rate;the type of baffle had an insignificant effect on the first-order tangential mode characteristics of the combustion chamber.
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