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Numerical evaluation of acoustic characteristics of a thrust chamber with quarter-wave resonators

Science China(Technological Sciences) 2021年第2期64卷 375-386页

作者： QIN JianXiu ZHOU LiXin ZHANG HuiQiang WANG Bing China Academy of Aerospace Aerodynamics Beijing 100074China Xi’an Aerospace Propulsion Institute Xi’an 710100China School of Aerospace Engineering Tsinghua UniversityBeijing 100084China

Acoustic characteristics of a thrust chamber with quarter-wave resonators are numerically studied based on the unsteady Reynolds-averaged Navier-Stokes(URANS) method. Organized pressure disturbance model and constant-volume bomb model are applied as artificial disturbances to excite pressure oscillations in the chamber. Eigenfrequencies and amplitudes of acoustic modes of the chamber are obtained by fast fourier transform(FFT) analysis, while damping characteristics are evaluated by the half-power bandwidth method. Predicted damping capacities of the chamber with and without quarter-wave resonators agree well with experimental results. Pressure oscillations can be controlled by a quarter-wave resonator mainly through reducing the amplitude of target acoustic mode, rather than increasing damping capacity of the chamber. Major damping mechanism of the resonator is cutting down pressure peak of target acoustic mode and raising up its pressure trough(CPRT);therefore the amplitude of target acoustic mode is reduced significantly. Moreover, acoustic energy can be dissipated by vortex at the orifice and by viscosity on the surface of a resonator, which increase damping capacity of the chamber slightly. Under the condition with multi-modes pressure oscillations, a resonator can still suppress pressure oscillations of target acoustic mode through ***, it may enhance pressure oscillations of other modes due to redistribution of oscillation energy among all acoustic modes.

关键词： quarter-wave resonator eigenfrequency acoustic mode pressure oscillation damping capacity

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Structural analysis of quarter-wave resonators in IMP

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Chinese Physics C 2013年第10期37卷 78-82页

作者：张聪贺守波王若旭张生虎何源赵红卫 Institute of Modern Physics Chinese Academy of Sciences University of Chinese Academy of Sciences

The taper-shaped superconducting quarter wave resonators with frequency of 80.5 MHz, β of 0.041 and 0.085 have been pre-researched. The radio frequency （RF） design of the cavities has been completed, and the structural design is also an important aspect which will be discussed in the following. The frequency shift caused by the etching effects of the surface treatment, the helium bath pressure and the Lorentz force, and the mechanical modes caused by the microphonic excitation have been anMyzed. The results show that the frequency variation from the Lorentz force is not serious and stiffening rings are explored aimed at decreasing the deformation brought by the helium pressure and microphonic excitation.

关键词： quarter-wave resonator structural stability etching effect Lorentz force detuning helium pressuredetuning mechanical vibration

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Preliminary study of a niobium quarter-wave prototype cavity for a heavy-ion superconducting linac

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Chinese Physics C 2010年第11期34卷 1757-1761页

作者：张聪赵红卫何源许哲张周礼孙列鹏梅立荣丛严 Institute of Modern Physics Chinese Academy of Sciences Graduate University of Chinese Academy of Sciences

Superconducting quarter-wave resonators,due to their compactness and their convenient shape for tuning and coupling,are very attractive for low-β beam *** this paper,two types of cavities with different geometry have been numerically simulated the first type with larger capacitive load in the beam line and the second type of lollipop-shape for 100 MHz,β=0.06 beams then the relative electromagnetic parameters and geometric sizes have been *** is found that the second type,whose structural design is optimized with the conical stem and shaping drift-tube,can support the better accelerating *** the end of the paper,some structural deformation effects on frequency shifts and appropriate solutions have been discussed.

关键词： quarter-wave resonator superconductivity numerical simulation electromagnetic field frequency shift linear accelerator

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