Jul 2026· Journal of Engineering For Gas Turbines and Power· Vol 148· 0 citations
Abstract
Research has shown that rotating detonation turbine engines have the potential to enhance aero-engine performance. However, the rotating back-propagation pressure wave (RBPW) generated by the detonation-based combustor can adversely affect the upstream compressor. In this study, this unsteady backpressure was simulated using a user-defined function (UDF), and its impact on a centrifugal compressor was numerically investigated. The results show that, under single-wave RBPW, both the total pressure ratio and isentropic efficiency declined at the same mass flow rate compared to steady-state conditions. Variations in the characteristic parameters of the RBPW resulted in shifts of the compressor's operating point. A higher-pressure distortion index caused a greater deviation from the original characteristic line. Increasing the propagation frequency or using a multi-wave configuration mitigated these adverse effects. Under four-wave excitation, compressor performance exceeded that of steady operation. Finally, the stability boundaries of the compressor under RBPW were defined in terms of constant flow rate and constant power constraints.
Abstract To mitigate turbine performance degradation caused by the highly pulsating exhaust from a pulse detonation combustor (PDC) in pulse detonation turbine engines, a shock divider was employed in this study to regulate the detonation gas. An asymmetric dual-channel shock divider was designed and manufactured, and...
Ke-Xin Liu, Long-Xi Zheng, Dingding Wang et al.· International Journal of Tur...· 0 citations
Rotating Detonation Engines (RDEs) offer a promising path toward more efficient and compact propulsion and power systems. However, the highly unsteady and transonic outlet flow generated by the detonation process, characterized by oblique shock wave patterns, introduces significant challenges for turbine integration...
L. Pinelli, Pietro Biagini, M. Marconcini et al.· Journal of turbomachinery· 0 citations
The main reason for limiting the working flow range of the compressor is the unstable flow phenomenon of the compressor working at a small flow rate, including stall, surge, and rotational instability. Among them, the rotating stall phenomenon is particularly prone to occur during the operation of centrifugal compresso...
Zhuhai Zhong, Xiaodan Zhang, Kunlun Bai et al.· Fluids· 0 citations
To suppress the flow-induced vibration of a single-stage single-suction centrifugal pump (rated head 5 m, flow rate 30 m
3
/h, rotational speed 1000 r/min), the key impeller parameters were taken as design variables and screened via the parameter sensitivity analysis method in this study. The internal flow field wa...
Jia-Fu Guo, Xinxiang He, Abdul Mutalib bin Leman et al.· Proceedings of the Instituti...· 0 citations
Shaftless pump-jet propulsors offer high propulsion efficiency but also generate significant flow-induced noise due to complex internal rotating flows. This study investigates blade deflection angles of ‒2°, 0°, and +2° through unsteady simulations with the RNG
k–ε
turbulence model, supported by experimental valida...
Hou-lin Liu, Yang Zhao, Xianfang Wu et al.· Proceedings of the Instituti...· 0 citations
This study numerically investigates the effect of low-momentum blowing applied to a toroidal propeller on aerodynamic performance and aeroacoustic characteristics. A Delayed Detached Eddy Simulation (DDES) approach coupled with the Ffowcs–Williams and Hawkings (FW–H) acoustic analogy is employed to resolve unsteady f...
M. Chen, Omar D. Lopez Mejia, Jielong Cai et al.· International Journal of Aer...· 0 citations
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