动力装置的噪声是影响舱室工作环境的直接因素，为降低某新型汽轮机的运行噪声，本文采用数值计算与试验验证的方法，对其进汽管原方案和改型方案进行了流动与噪声分析，并得到了现场噪声实测支撑，验证了噪声分析方法的可信性。计算与试验结果均表明，改型方案气动及噪声特性优化效果明显，原方案等径直角三通输送流体时交接处会产生较强的低速漩涡，产生噪声约101.3dB。改型方案异径135度非标三通在交接处低速漩涡消失，产生噪声水平约50dB

The noise of the power device is directly a key factor in the working environment of the cabin. In order to reduce the operating noise of a certain steam turbine, numerical calculation and experimental verification methods were used to conduct flow analysis and noise analysis on its inlet pipe and modification scheme, and on-site noise measurement support was obtained, verifying the credibility of the noise analysis method. The calculation results and experimental results both indicate that under the boundary conditions, strong low-speed vortices will be generated at the junction of the equal diameter right angle tee when transporting fluid, resulting in noise of about 101.3dB. The noise level of the 135 degree non-standard tee with different diameters is about 50dB at the same position, and the optimization effect of aerodynamic and noise characteristics is obvious, providing a method reference for the low noise design of flow components.