大温差高速燃气喷水冷却器喷嘴阵列设计

Design and Simulation of the Nozzle Array for High Temperature Gas Cooler

喷水冷却器用于某高温燃气流风洞,其功能为将温度3600 K,流量1100 m^3/s,入口流速120 m/s的大流量高温高速燃气降温至673 K。冷却器采用直接喷淋设计,以雾化喷嘴阵列将水喷入燃气流场中,利用水的汽化潜热冷却燃气。本文主要讨论了喷嘴阵列的设计。采用数值仿真方法,基于DPM(离散相)模型,对燃气冷却器内部的两相流动、传热和传质情况进行了数值模拟。应用该模拟方法,首先研究了影响冷却器内流场的关键因素;而后经过多方案迭代设计,得出了可行的喷嘴阵列构型;最后进行了喷嘴阵列性能实验,对该构型下冷却器的性能进行了验证,结果优于设计指标。以上述工作为基础,本文还提出了一些冷却器用喷嘴阵列的设计方法。

Gas cooler is a part of high temperature gas tunnel,which is used to cool a stream of gas with 3650 K temperature,1100 m^3/s flow rate and 120 m/s speed to 673 K temperature.The scheme of this gas cooler is to inject water to the gas flow using an array of nozzles,cool high temperature gas with latent heat of water.Design of the nozzle is the main subject of this paper.Two-phase flow,heat transfer and mass transfer in the gas cooler is simulated by using CFD(computational fluid dynamic)method based on DPM(discrete phase model).Then,first key factors affecting flow field pattern in the gas cooler in studied,second a scheme of nozzle array is designed step by step,at last a performance test was conducted after the wind tunnel finishes construction,and the test result turns out to be better than design specifications.In the last,some design methods of nozzle array was given.