【摘要】 本文用气粒两相流双流体模型,气相湍流的k-ε模型及颗粒湍能k_p输运方程模型,即k-ε-k_p模型,对大速差射流燃烧室内三维回流湍流气粒两相流动进行了模拟,给出了各纵剖面内气相及颗粒时均轴向速度分布、气粒两相各自的湍流强度分布、颗粒轴向质量流分布及各横截面内气粒两相时均周向速度分布。预报结果与激光多普勒仪测量结果定性上类似,特别是正确地预示出实验中观测到的流场某些区域内颗粒湍流度大于气相湍流度的现象,又一次表明,全面计及颗粒湍能输运过程的模型比经典的局部追随的颗粒湍能代数模型更合理。更多还原

【Abstract】 The three-dimensional turbulent recirculating gas-particle flows in a combustor of coflow jets with large velocity difference is simulated by using a k-ε-kP model, i.e., the two-fluid model combined with the k-ε gas turbulence model and a transport equation-model of particle turbulence. Predictions give the time-averaged axial velocity and RMS fluctuation velocity distributions of gas and particle phases, particle axial mass flux distribution in different x-r planes, and also the azimuthal velocity distribution of gas and particle phases in different cross-sectional planes. Comparison of predictions with experiments shows that the k-ε-k model can predict many important features of the complex 3-D gas-particle flows observed by LDV measurements, especially stronger paricle turbulence’ compared with gas turbulence at some locations, which cannot be explained by the algebraic model of particle turbulence based on the concept of "particle tracking fluid". Therefore, the k-ε-kp model is a more reasonable one compared with previous models.更多还原