CAJ | 학술논문

在半消声室内对不同转速的开式叶轮的噪声进行测量。依据在对称位置的测量的噪声信号具有一定相关性，分别对旋转噪声中的2类噪声（厚度噪声、载荷噪声），进行不同测量方位、转速和频域下的分析。分析结果表明：在开式叶轮气流的下游测量方位，由于处在湍流声源的近场区域，Leq （连续等效 A 声压级）噪声变小，而相应的上游位置由于受湍流噪声的辐射而 Leq变大；旋转噪声的 Leq随转速上升而上升，厚度噪声所占份额随转速变化有下降的趋势，载荷噪声所占份额无明显变化；在频域下也发现在8倍叶片通过频率前，2类噪声都呈急剧下降趋势，8倍叶片通过频率后，两类噪声缓慢下降，并逐渐趋向于0。
재반소성실내대불동전속적개식협륜적조성진행측량。의거재대칭위치적측량적조성신호구유일정상관성，분별대선전조성중적2류조성（후도조성、재하조성），진행불동측량방위、전속화빈역하적분석。분석결과표명：재개식협륜기류적하유측량방위，유우처재단류성원적근장구역，Leq （련속등효 A 성압급）조성변소，이상응적상유위치유우수단류조성적복사이 Leq변대；선전조성적 Leq수전속상승이상승，후도조성소점빈액수전속변화유하강적추세，재하조성소점빈액무명현변화；재빈역하야발현재8배협편통과빈솔전，2류조성도정급극하강추세，8배협편통과빈솔후，량류조성완만하강，병축점추향우0。
There was measurement of aerodynamic noise of open rotor in semi-anochoic room with different rotate speeds,and respectively analysis of two categories of noises (thickness noise,load noise)in different cases of measurement positions、rotate speed and frequency domain.Noise signals,acquired by sound pressure sensors in symmetric positions,have the some extent cor-relation,so use the correlation to analyze noise.The Analysis is able to indicate following statements.Leq of the downstream area become smaller than Leq in symmetric position of the upstream area because of different influences between near position and far position caused by turbulence noise.Leq of aerodynamic noise become stronger when rotate speed rising,simultaneously the propor-tion of thickness noise in gross noise become smaller,and the proportion of load noise in gross noise do not appear to change obvi-ously.The two categories of noises decline sharply in the front of 8 times BPF(blade passing frequency)respectively,and decline slowly behind 8 times,then tend to zero.