Our work is only an attempt about the study on the application of piv techniques and numerical simulation in the dense gas solid flow of the circulating fluidized beds . the results show that the accuracy and efficiency of the piv techniques and numerical simulation method on the test and prediction of the hydrodynamics of the gas solid in circulating fluidized beds riser 本文的研究工作是对piv技术应用于循环流化床内气固多相流动特性测试和数值模拟的尝试，所取得的结果表明piv技术和数值试验方法在测试和预测气固多相流动特性方面的准确性和有效性。
