摘要
Abstract
According to the demands of the manned space program, the project of the LOX/CH4 engine key techniques needs to be studied for the multi-startup and 10% ~100% deep thrott-ling capability, whose thrust is 80 kN. The variable thrust adaptability of the floating ring seals in the engine would affect safety and reliability of the oxygen turbopump assembly as one of the core compo-nents in rocket engines. In this paper, according to variable thrust requirements of the engine system, the floating force of the floating ring seals under the conditions of different thrust and eccentricity ratio is calculated with the numerical method, which is compared with drag force calculated with one-di-mensional formula. Based on the above measures, the eccentricity ratio (0. 4~0. 6) of the first and second floating ring seals working at full work conditions, and the leakage rate of 2. 58~39. 4 g/s are determined. Working within the range of this eccentricity ratio, the floating ring seals has high relia-bility and capability of working in changing conditions with a wide range, the rubbing or breaking of its edge can be avoided, which can satisfy safety requirements of the turbopump and deep throttling requirements of the engine. The results could provide a theoretical foundation for turbopump project approach and design.关键词
深度变推/氧涡轮泵/浮动环密封/变工况适应性Key words
deep throttling/oxygen turbopump/floating ring seal/variable thrust adaptability分类
航空航天
