Abstract
Due to the strong unsteadiness of pulse detonation,large flow losses are generated when the detonation wave interacts with the turbine blades,resulting in low turbine efficiency.Considering that the flow losses are dissipated into the gas as heat energy,some of them can be recycled during the expansion process in subsequent stages by the reheat effect,which should be helpful to improve the detonation-driven turbine efficiency.Taking this into account,this paper developed a numerical model of the detonation chamber coupled with a two-stage axial turbine,and a stoichiometric hydrogen-air mixture was used.The improvement in turbine efficiency attributable to the reheat effect was calculated by comparing the average efficiency of the stages with the efficiency of the two-stage turbine.The research indicated that the first stage was critical in suppressing the flow unsteadiness caused by pulse deto-nation,which stabilized the intake condition of the second stage and consequently allowed much of the flow losses from the first stage to be recycled,so that the efficiency of the two-stage turbine was improved.At a 95％confidence level,the efficiency improvement was stable at 4.5％-5.3％,demonstrating that the reheat effect is significant in improving the efficiency of the detonation-driven turbine.
基金项目
National Natural Science Foundation of China(12372338)
National Natural Science Foundation of China(U2241272)
Natural Science Foundation of Shaanxi Province of China(2023-JC-YB-352)
Natural Science Foundation of Shaanxi Province of China(2022JZ-20)
Guangdong Basic and Applied Basic Research Foundation(2023A1515011663)
Practice and Innovation Funds for Graduate Students of Northwestern Polytechnical University(PF2023010)
维普
万方数据