CAJ | 학술논문

研究了离心压缩机机壳在内部基频气动力激励下的振动辐射噪声。考虑机壳与轮盘、轮盖之间的间隙，采用湍流模型模拟了离心压缩机的整机三维非定常流场，得到蜗壳内表面的脉动压力，然后将脉动压力的基频部分加载到蜗壳上，模拟离心压缩机蜗壳在非定常气动力激励下的振动噪声。研究表明：机壳内壁面基频压力脉动主要分布在无叶扩压器靠近叶轮出口一侧；机壳主要基频振动噪声源位于蜗壳靠近出口管道一侧；该离心压缩机机壳基频振动位移幅值很小，最大振动位移仅为11.8×10-9m，因此可以忽略机壳的基频振动对离心压缩机运行安全性的影响。
연구료리심압축궤궤각재내부기빈기동력격려하적진동복사조성。고필궤각여륜반、륜개지간적간극，채용단류모형모의료리심압축궤적정궤삼유비정상류장，득도와각내표면적맥동압력，연후장맥동압력적기빈부분가재도와각상，모의리심압축궤와각재비정상기동력격려하적진동조성。연구표명：궤각내벽면기빈압력맥동주요분포재무협확압기고근협륜출구일측；궤각주요기빈진동조성원위우와각고근출구관도일측；해리심압축궤궤각기빈진동위이폭치흔소，최대진동위이부위11.8×10-9m，인차가이홀략궤각적기빈진동대리심압축궤운행안전성적영향。
This paper has studied the vibration radiated noise of centrifugal compressor casing under the excitation of internal fundamental frequency aerodynamic. Considering the gap of casing with wheel disc and shroud, the turbulence model was used to simulate the 3D unsteady flow field of the centrifugal compressor, the fluctuating pressure on the internal surface of volute was obtained. Loading the fundamental frequency of fluctuating pressure on the volute, the simulation on vibration and noise of centrifugal compressor volute under the excitation of unsteady aerodynamic was carried out. The research shows that the fundamental frequency pressure pulsation on the inner wall of casing is mainly distributed on the side of vaneless diffuser near impeller outlet, the main fundamental frequency vibration and noise source of casing is located in the side of volute near outlet pipe. The fundamental frequency vibration displacement amplitude of the centrifugal compressor casing is very small that the maximum vibration displacement is only 11.8 × 10-9m. Therefore, the influence of fundamental frequency vibration of casing on the operating safety of centrifugal compressor can be neglected.