NYCU ME
Student Speaker: Meng-Che Li(李孟哲)
Title: Development of a Regeneratively Cooled Hybrid Rocket Engine with Throttling and Thrust Vector Control Capability
Date: 2021/05/27 (Thursday) 3:30 pm – 5:20pm
Location: video conference
Abstract:
In this study, both hybrid rocket motors without and with regenerative cooling design were manufactured and tested. Several horizontal catalytic bed only and hot-fire tests were conducted to recognize the effect of regenerative cooling on hybrid rocket motors. The design of regenerative cooling decreased the catalytic bed outlet temperature but remained the c*. For the hot-fire test result, the regenerative cooling decreased the deviation of fuel regression rate between upstream and downstream. The lower deviation maintained a higher swirling intensity in downstream combustion chamber, which also made a higher fuel regression, a lower O/F ratio, and a higher mixing efficiency, resulted in a higher Isp efficiency (96.2% to 98.6%.) Thereafter, the regeneratively cooled hybrid rocket motor was operated with several hot-fire tests including single step and multiple step of the oxidizer mass flow rate as desired profile. An in-housed throttle valve controlled the oxidizer mass flow rate to throttle the thrust. Not only the thrust but the chamber pressure were both found as two linear functions of the operating 𝑚̇ 𝑜𝑥 . In addition, the O/F ratio did not shift a lot among all tests. Finally, the regeneratively cooled hybrid rocket motor was assembled with an electrical directly-driven motor to perform a vertical thrust-vector-control (TVC) hot-fire test. The TVC system performed very well with the angle accuracy lower than 0.1o and oscillation 0.05o