基于先验知识的炉内速度场声波法测量研究

采用主动声波法,基于少量测量数据重建切圆燃烧锅炉炉膛空气速度场.从切圆炉内空气速度场服从的物理、数学规律出发,充分利用其有效先验知识使反问题超定,首次提出利用旋转高斯曲面拟合炉内切圆速度矢量场无散分量部分的算法,并结合介质质量守恒定律及相应边界条件,对炉膛二维断面速度场进行了有效重建.在典型的仿真模拟检验基础上,详实的冷态炉膛模型声波法在线测量试验得出了可靠的结果.为该方法进一步研究提供了有效的理论及实验基础.

Acoustic Measurement of In-furnace Air Velocity Fields Based on Apriori Knowledge

Active acoustic method was adopted to measure and reconstruct an air velocity field in a tangen- tially fired furnace, based on rare data achieved. From the point of view of physical and mathematical laws obeyed by air velocity field in the furnace, and using its effective apriori knowledge, an algorithm was first proposed for fitting the solenoidal component of a velocity field by means of a Gaussian curved surface, with which the 2D cross-sectional air velocity field was reconstructed based on the law of mass conversation and related boundary conditions. By typical simulations and sufficient experimental measurements in a lab- scale model furnace, the algorithm has been proved to be feasible and reliable. This may serve as a refer- ence for further researches on similar measurements, theoretically and experimentally.