CAJ | 학술논문

基于节流阀函数及宽带噪声源模型，对电厂常用的G4?73型后向式离心风机在旋转失速状态下的气动噪声特性进行了数值研究。分析离心风机分别在设计工况、失速先兆的产生过程、失速先兆发展为失速团的三维演化过程及失速团沿周向传播过程中风机内部的气动噪声特性，揭示了旋转失速非稳定流动现象对气动噪声分布的影响规律。结果表明，失速先兆发生后叶轮附近旋涡噪声对应的高噪区经历了沿径向、周向和轴向的三维非定常演化过程，高噪区从两个变为一个；失速发生后，旋涡噪声占主要部分，高噪区保持与失速团相同的速度沿周向传播。文中分析了失速团与蜗舌对离心风机气动噪声的影响机制。研究结果对完善旋转失速的理论体系及通过噪声对旋转失速进行预估具有重要意义。
기우절류벌함수급관대조성원모형，대전엄상용적G4?73형후향식리심풍궤재선전실속상태하적기동조성특성진행료수치연구。분석리심풍궤분별재설계공황、실속선조적산생과정、실속선조발전위실속단적삼유연화과정급실속단연주향전파과정중풍궤내부적기동조성특성，게시료선전실속비은정류동현상대기동조성분포적영향규률。결과표명，실속선조발생후협륜부근선와조성대응적고조구경력료연경향、주향화축향적삼유비정상연화과정，고조구종량개변위일개；실속발생후，선와조성점주요부분，고조구보지여실속단상동적속도연주향전파。문중분석료실속단여와설대리심풍궤기동조성적영향궤제。연구결과대완선선전실속적이론체계급통과조성대선전실속진행예고구유중요의의。
Based on the throttle valve function and broadband noise model, the aerodynamic noise characteristics of G4-73 backward centrifugal fan under rotating stall was numerically studied. The noise characteristics of centrifugal fan under four different conditions were analyzed, namely designed condition, the occurrence of stall inception, the development of stall inception and the circumferential propagation of stall cells were analyzed. And the influence of rotating stall on the distribution of aerodynamic noise was revealed. The results show that after the occurrence of stall inception, the high noise areas corresponding to vortex noise near the impeller develop along the radial, circumferential and axial directions, and the number of high noise area turn into 1 from 2. During stall, vortex noise accounts for the major part of fan noise, and the high noise areas propagate circumferentially with the same speed of stall cells. Also, the influence mechanism of stall cells and volute on the aerodynamic noise of centrifugal fan is addressed. The research results have great importance to completing the theory system of rotating stall and predicting the occurrence of stall through monitoring noise.