CAJ | 학술논문

在保证面积不变的情况下，选取不同的长轴、短轴，对波瓣混合器进行椭圆形切扇修形，研究切口深度与宽度对波瓣混合器掺混性能的影响规律。使用商用 CFD 软件对流场进行数值模拟。结果显示，对波瓣侧壁进行切扇处理会加强流向涡的强度，切扇越深，流向涡强度越大；切扇波瓣流向涡的耗散速率要大于基准波瓣混合器的流向涡耗散速率，预示着更为高效的掺混；引射系数与切口深度成正比，而总压恢复系数与切口深度成反比。考察了两种衡量热混合效率的模型并对其信度进行了比较，发现在 x =0.4 m 之前切扇可以提高热混合效率，而在 x =0.4 m 之后，基准波瓣混合器热混合效率要大于切扇波瓣混合器。
재보증면적불변적정황하，선취불동적장축、단축，대파판혼합기진행타원형절선수형，연구절구심도여관도대파판혼합기참혼성능적영향규률。사용상용 CFD 연건대류장진행수치모의。결과현시，대파판측벽진행절선처리회가강류향와적강도，절선월심，류향와강도월대；절선파판류향와적모산속솔요대우기준파판혼합기적류향와모산속솔，예시착경위고효적참혼；인사계수여절구심도성정비，이총압회복계수여절구심도성반비。고찰료량충형량열혼합효솔적모형병대기신도진행료비교，발현재 x =0.4 m 지전절선가이제고열혼합효솔，이재 x =0.4 m 지후，기준파판혼합기열혼합효솔요대우절선파판혼합기。
Oval scalloping modification on a lobed mixer was conducted. A set of semi-ellipsis of the same area but with different length of major and minor axes which represent the depth and width of scalloping re-spectively was adopted. The effect on aerodynamic performance of the lobed mixer was studied in this paper by CFD software in terms of streamwise vorticity,pumping factor,total pressure recovery coefficientand the thermal mixing efficiency. The results show that deeper scalloping attains strongerstreamwise vorticity. The dissipation of streamwise vorticity of the scalloped lobed mixers is faster than that of baseline lobed mixer. Pumping factor is directly proportional to the depth of the notch while total pressure has an inverse relation-ship with the depth. The fidelity of two different models for thermal mixing efficiency is evaluated. It is re-vealed by comparison thatscalloping enhances thermal mixing efficiency before x = 0. 4 mm. After that the baseline lobed mixer has a larger value than the scalloped mixers investigated.