论文部分内容阅读
为研究真空管道中高速列车的气动噪声源特性,建立低压环境下真空管道高速列车空气动力学计算的流体模型、数学模型和数值模型,以及高速列车偶极子噪声源和四极子噪声源的计算模型,研究管道压力、列车速度和阻塞比对真空管道高速列车偶极子噪声源和四极子噪声源的影响。计算结果表明,在低压(103~104 Pa)环境下,真空管道中的空气流动可以采用连续介质模型描述。高速列车偶极子噪声源和四极子噪声源均与车速的对数成线性关系,当车速为600 km/h时,四极子噪声源较小,偶极子噪声源占据主导地位,随着列车速度的提高,四极子噪声源变得明显,并占据主导地位。降低管道压力和阻塞比可以有效减小高速列车气动噪声源的强度。
In order to study the characteristics of aerodynamic noise sources of high-speed trains in vacuum ducts, a fluid model, a mathematical model and a numerical model for aerodynamics calculation of high-speed trains in vacuum ducts under low pressure are established, and the calculation of high-speed train dipole and quadrupole noise sources Model to study the influence of pipeline pressure, train speed and blockage ratio on dipole noise sources and quadrupole noise sources of high-speed vacuum pipeline trains. The calculation results show that the air flow in the vacuum pipe can be described by the continuous medium model under low pressure (103 ~ 104 Pa). The dipole noise sources and quadrupole noise sources of high-speed trains are linearly related to the logarithm of vehicle speed. When the vehicle speed is 600 km / h, the quadrupole noise source is small and the dipole noise source dominates. With the increase of train speed, the quadrupole noise source becomes obvious and dominates. Reducing pipeline pressure and blockage ratio can effectively reduce the intensity of aerodynamic noise sources in high-speed trains.