基于非定常计算的对旋风机压力脉动分析

利用Realizable k-ε湍流模型对局部对旋负机进行了全流道非定常湍流计算,预测了前后两级化附近各干涉面上压力脉动的时域分布情况。分析结果表明,前后两级叶轮之间的动-动干涉、前后两级叶轮与其相邻部件之间的动-静干涉以及流动的周期非定常特性是对旋式通风机内部压力脉 动产生的主要根源;后级叶轮叶片对叶轮区域压力脉动的影响要远大于前级叶轮。数值模拟结果可以作为对旋风机叶轮部分气动噪声预估的参考依据。

Analysis of Pressure Pulsation of Counter-rotating Ventilator Based on Unsteady Calculation

Three-dimensional unsteady flow has been performed using Realizable k-ε turbulence model in full flow passage of a counter-rotating ventilator. The time domain distribution of pressure pulsation at the interference planes in the vicinity of three pairs of impellers has been predicted. The results indicate that the motion-motion interference between the two counter-rotating impellers and the motion-motionless interference between the impellers and their adjacent stationary parts,as well as the periodical unsteady characteristics of the flow are the main sources resulting in the pressure fluctuation inside the ventilator, and as far as the impact of the pressure pulsation between two im- pellers is concerned, the latter is much stronger than the former. The numerical simulation results can be used as the reference for the estimation of the aerodynamic noise of ventilator.