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本文应用二流湍流模型和“常数有效粘度”,并将“混合长度”作为湍流流团的平均尺寸来模拟定常和非定常、二维轴对称湍流射流.二流湍流模型假设湍流流场中的每一点为“湍流”和“非湍流”流体所交替占据,从而模拟了湍流的“间隙”现象。本文将计算值与完整的定常二维轴对称湍流射流的实验值进行比较,验证了数学模型的可靠性;而非定常射流的计算结果则与相对应的定常射流的计算结果及现有的非定常射流的实验值进行了比较,取得了可以接受的一致性。本文还对数学模型及计算结果进行了讨论。
In this paper, the second-order turbulence model and the “constant effective viscosity” are used, and the “mixing length” is used as the average size of the turbulent flow group to simulate the steady and unsteady two-dimensional axisymmetric turbulent jets.The second-order turbulence model assumes that every point in the turbulent flow field Alternating between “turbulent” and “non-turbulent” fluids, simulating turbulent “gap” phenomena. In this paper, the calculated values are compared with the experimental data of a complete two-dimensional axisymmetric turbulent jet, which verifies the reliability of the mathematical model. However, the unsteady jet results are compared with those of the conventional jet The experimental values of the steady jet were compared and achieved an acceptable agreement. The paper also discusses the mathematical model and the calculation results.