重型燃气轮机进气系统性能研究

针对某款重型燃气轮机进气系统辐射噪声超标问题，采用声学有限元法和计算流体力学方法对系统部件进行声学和流场计算，得出插入损失和压力损失，并与进气系统指标要求进行比较发现，进气系统噪声指标与限值余量较小，且压力损失远低于限值。在分析的基础上，选取片式消声器为研究对象，研究不同结构参数和形式对进气系统声学性能和空气动力学性能的影响。结果表明：片式消声器的厚度和数量对进气系统性能有明显的影响，当增加片式消声器厚度和数量时，压力损失略有增加，插入损失增大，进气口声压级减小；通过添加侧支共振器，进气口总声压级降低了3.1 dB(A),可以有效增大进气系统低频插入损失。

Study on Performance of Heavy duty Gas Turbine Air Intake System

In response to the issue of excessive radiation noise in the air intake system of a heavy duty gas turbine, the insertion loss and pressure loss were predicted by using the acoustic finite element method and the computational fluid dynamics (CFD) method to calculate the acoustic field and flow field of the system components, and compared with the requirements of the air intake system specification index. It was found that the air intake system noise indicators and limit values had a small margin, and the pressure loss was much lower than the limit value. Therefore, based on the analysis, the splitter silencer was selected to investigate the influence of different structural parameters and forms on the acoustic performance and aerodynamic performance of the air intake system. The results show that the thickness and number of the splitter silencer have a significant impact on the performance of the air intake system. When the thickness and number of the splitter silencer increase, the pressure loss increases slightly, the insertion loss increases, and the sound pressure level of air inlet decreases; by adding a quarter wavelength resonator, the total sound pressure level of air inlet has been reduced by 3.1 dB (A), which can effectively increase the low frequency insertion loss of the air intake system.