炉内温度速度耦合场声线弯曲特性研究

Research on the Sound Ray Bending Characteristics of Temperature-Velocity Coupling Field in Furnace

为了实现声波法测量热物理量场的可靠重建,弄清介质温度和流速对声速的耦合作用机理,采用三角形前向展开法和Lagrangian法建立追踪模型,针对仿真的不同炉膛典型温度场和流场,研究了声波传播路径的弯曲效应,同时建立一维流场模型以从理论角度验证上述方法的可行性和可靠性。结果表明:炉内烟气温度、流速耦合场对声波传播路径影响复杂,若不考虑声线弯曲,必将导致相应声学法温度场和流场测量重建结果的失真;基于上述不同理论方法计算追踪出的对象场声线分布彼此吻合,证明所建声线追踪模型可靠。

In order to realize the reliable reconstruction of the thermophysical quantity field measured by the acoustic wave method and clarify the coupling mechanism of the medium temperature and flow velocity on the acoustic velocity,the triangle forward expansion method and the Lagrangian method were used to establish the tracking model.For the typical temperature field and flow field of different furnaces,the path bending effect of acoustic wave propagation was studied.Meanwhile a one-dimensional flow field model was established to verify the feasibility and reliability of the above method theoretically.Results show that the coupling temperature and flow field of flue gas has complex effect to the sound ray paths in furnace.The reconstruction results of temperature and flow field by acoustic method will be distorted if the bending of sound line is ignored.The sound ray distribution is consistent with each other in different theoretical methods,which proves that the sound ray tracking model is reliable.