一种直升机进气道电磁散射减缩方案实验研究
Experimental Study of RCS Reduction for a Helicopter Inlet
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摘要: 对一种与发动机舱融合设计的直升机进气道在垂直极化方式、水平极化方式下进行了电磁散射特性减缩方案研究。通过对比不同减缩方案与全金属模型RCS性能参数,研究了各种减缩方案的减缩效果,结果表明,该类进气道在采用电磁散射减缩方案时,RCS较全金属模型而言,均有不同程度的降低,其中采用在前唇口、上下唇口、前输出轴、动力舱粘贴吸波材料缩减方案的减缩效果是最佳的,可以获得8dB左右的RCS减缩效果。另外,垂直极化方式下采用减缩方案的减缩效果要比水平极化方式效果好。Abstract: An experimental study of RCS reduction for a helicopter inlet syncretized with engine cabin was completed in vertical and horizontal polarization ways.Meanwhile,the RCS reduction effects were analyzed for various reduction schemes by comparing with RCS of pure metal model.The results show that RCS of this inlet is lower than that of the pure metal model.Sticking radar absorbing materials on front lip,upper lip,inferior lip,output shaft,and engine cabin has best RCS reduction effect.This method can achieve about 8 dB of RCS reduction.Besides,the effect of RCS reduction in vertical polarization way is better than that of in horizontal polarization way.
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Key words:
- aerospace propulsion system /
- helicopter inlet /
- radar cross section /
- stealth technique
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