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An unsteady internal ballistic performance model was proposed t o take account for the variance of local regression rate along the grain port of a hybrid rocket c ombustor. The characteristic parameters of hybrid rocket motor was investigated. The performance model of concern in the study was fairly comparable with the test result. The combustion coefficients an d local burning characteristics of a hybrid rocket motor were evaluated. The local variation of the oxidizer mass flow rate results in the changes of local regression rate, pressure, temperature, and ga s velocity to flow direction, which was analyzed quantitatively.                    .                   .         , ,        .Key Words: Hybrid Rocket( ), Performance Prediction(), Local Regression Rate( )

Performance Prediction Method of Hybrid Rocket Motors with Local Variance of Combustion