Abstract
DOI: 10.2514/1.48783 Numerical simulations and experiments were conducted to analyze the dynamic characteristics of a newly developed bellows-type stabilizer, which maintains a steady propellant mixture ratio in the gas generator of a liquid rocket engine. A nonlinear mathematical model of the stabilizer and a linear version of the model were developed. The dynamic characteristics predicted by the linear model showed good agreement with experimental results, thus provingthevalidityofthemodel.Itwasfoundthroughsensitivityanalysesthatthemaindesignparametersaffecting the dynamic characteristics of the stabilizer system are the orifice diameter and the length of the pilot line. Nomenclature Aa = flow area of pipe after stabilizer, m 2 Aj = geometric flow area of slot, m 2 Ap = flow area of pilot line, m 2 Aps = bottom area of spool, 0:25� � D 2 � D 2� , m 2 Aref = area of spool head, 0:25�D 2, m 2 As = effective area of sensing chamber Vs, 0:25� � D 2 � D 2� , m 2 Asn = sensing area of sensing chamber Vs, 0:25� � D 2 � D 2� , m 2 A2 = outlet port area, m 2 � B = steady-state variable Cd = discharge coefficient
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