Aiming at the launch technical characteristics of strap-on launch vehicle, a simplified test system used for water jet noise reduction mechanism simulation is proposed and the preliminary test study has been finished. The analysis of water jet noise reduction simulation flow field data shows that once the low-speed, normal temperature liquid water jet flow injects into high-speed gaseous jet flow, liquid water is atomized instantaneously. Momentum of high-speed gaseous jet flow generates and energy exchange happens. The sound transformation ability that makes the high-speed gaseous jet flow form high sound intensity noise is weakened. It is also shown that the concentration of the atomized flow is uniform during the follow-up propelling process, changing or even cutting off the transmission path of original jet flow noise. The frequency analysis of water jet noise reduction simulation test shows that within wide frequency spectrum, water jet has the ability to suppress noise, particularly for whistler-type noise.%针对捆绑式运载火箭发射技术特点,提出并研发相对简化的单喷管火箭发射喷水降噪机理模拟试验系统,完成单喷管火箭发射喷水降噪机理初步试验研究.对喷水降噪模拟试验流场数据、资料的分析表明,低速常温液态水射流喷入高速气态喷流后,液态水瞬间雾化,实现高速气态喷流动量、能量交换,高速气态喷流形成高声强噪声的声效转换能力由此下降.雾化水汽在后续推进过程浓度十分均匀,改变甚至切断原喷流噪声传播途径.发射喷水降噪模拟试验噪声频谱分析表明,喷水条件下喷水具备宽频范围内抑制噪声能力,同时,喷水抑制喷流噪声中啸音能力突出.
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