Abstract
Nuclear thermal propulsion (NTP) with a large specific impulse and a high thrust-to-weight ratio is one of the preferred propulsion technologies for realizing mankind’s vision of interstellar exploration. The system analysis of NTP, which is a crucial part of the system design, is used to evaluate the system response during operation. This work developed the NTPSS-vPower model on the vPower simulation platform for system simulation of a typical NTP system. Specifically, a properties model considering the thermal dissociation of high-temperature hydrogen, a point neutron kinetics model, a hybrid model of two-dimensional heat transfer and one-dimensional fluid flow of the core, and simplified models of the nozzle, turbine, and pump are developed. The differences of crucial parameters between steady-state simulation results and published design data are within 5%. Furthermore, NTPSS-vPower is used to simulate four typical events to predict the transient behavior of the system, which provides a reference for subsequent system analyses and experimental studies.
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