桨叶对直升机电磁散射特性的影响分析  

Analysis of Influence of Blade on Electromagnetic Scattering Characteristics of Helicopter

作　　者：王菁 刘战合 田秋丽[2] 姬金祖[3] 杨尚辉 

机构地区：[1]郑州航空工业管理学院航空工程学院,河南郑州450046 [2]郑州航空工业管理学院经贸学院,河南郑州450046 [3]北京航空航天大学航空科学与工程学院,北京100191

出　　处：《航空计算技术》2018年第1期49-52,57,共5页Aeronautical Computing Technique

基　　金：航空科学基金项目资助(2016ZA55001);河南省科技攻关计划项目资助(172102210530);郑州航空工业管理学院校青年科研基金项目资助(2017153003)

摘　　要：为研究桨叶对直升机电磁散射特性的影响,采用物理光学法计算了有桨、无桨直升机模型不同频率、俯仰角状态下的RCS曲线,提出了针对桨叶影响分析的RCS增益值概念。结果表明,桨叶对RCS曲线分布有一定影响,有桨RCS曲线接近"圆形",无桨为"矩形";俯仰角变化时,RCS曲线向内收缩;对前向30°角域,桨叶的增益值在0~12 d B,而对周向,为0~17 d B。研究结果发现,桨叶会降低直升机隐身性能,提高桨叶外形隐身设计可有效提高直升机隐身性能。In order to study the influence of the blade on electromagnetic scattering characteristics of helicopter,RCS curves of two helicopter models with and without propeller in different frequencies and pitch angles were computed by Physical Optics method. The definition of RCS gain value was proposed to analyze the effect of blade on RCS. Results indicated that blade had a certain influence on the distribution of RCS curves,the RCS of helicopter model with propeller was in a " round" distribution,and the RCS of model without propeller was in a " rectangular" distribution; the RCS curves would shrink inward with the change of pitch angle; the gain values of blade were about 0-12 d B in the angular domains of 30 degree on nose direction; and for circumferential direction,the gain values were about 0-17 d B. It's found that blade would reduce the stealth performance of helicopter,and it' s efficient to improve the shape stealth design of blade for improving helicopter stealth performance.

关 键 词：直升机 桨叶 电磁散射 RCS 隐身 

分 类 号：V218[航空宇航科学与技术—航空宇航推进理论与工程] TN011[电子电信—物理电子学]