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| Abstract: |
| Aerodynamic noise control is one of the key technologies in the development of stealth technology of torpedo. The noise producing mechanism in an ultra-high expansion ratio turbine with partial admission were discussed. Wide wakes originating from non-outlet region between elliptical nozzles, circumferential non-uniformity owing to partial admission design and complex shock system formed in narrow space between nozzles and rotors are three main sources of aerodynamic noise in this turbine. Thus, two kinds of aerodynamic noise control methods were put forward, namely adding axial gap between the nozzle and rotor, nozzle-down, bilateral repair and trailing edge blowing. Steady annulus simulation results showed that the aerodynamic noise was significantly reduced by more than 10 dB after optimization, which had little impact on the aerodynamic performance of the turbine. |
| Key words: ultra high expansion ratio turbine aerodynamic noise flow characteristics optimization |
| DOI：10.11916/j.issn.1005-9113.16126 |
| Clc Number:O357.1 |
| Fund: |
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| Descriptions in Chinese: |
| 超高膨胀比涡轮噪声控制技术研究 赵辛午，黄洪雁 （哈尔滨工业大学 能源科学与工程学院，哈尔滨 150001） 中文说明： 气动噪声控制是提高鱼雷隐身性能的关键技术之一。本文讨论了局部进气的超高膨胀比涡轮气动噪声产生机理。相邻喷嘴与流道之间形成的三角形非出气区域引起的尾迹、圆周局部进气设计引起的不稳定性、喷嘴和转子之间区域形成的复杂激波系是这类涡轮气动噪声产生的三种主要来源。因此，本文提出了两种气动噪声控制方法，增加转静子之间的轴向间距，喷嘴下俯、双侧修型和尾缘吹气。数值模拟结果表明：在对原涡轮气动性能影响不大的情况下，优化后涡轮的气动噪声下降10 dB以上。 关键词：超高膨胀比涡轮、气动噪声、流动特性、优化 |
