Transverse buoyant jet-induced mixed convection inside a large thermal cycling chamber with perforated plates is investigated experimentally and numerically. The mean temperature distribution and temperature fluctuation are obtained experimentally under cooling and heating conditions. The numerical simulation is conducted by solving the Reynolds-averaged Navier-Stokes (RANS) equations using the low-Re k-epsilon model. The modified body force based on the pressure loss analogy is adopted to describe the flow characteristics through the perforated plate. An additional transport equation is solved to determine the root mean square (RMS) of the temperature fluctuation. The proposed numerical method is validated with the experimental data. The flow field, mean temperature distributions, and RMS of the temperature fluctuation are studied for various values of the pressure loss coefficient of the perforated plate Eu and the dimensionless heights of the plenum h. The results indicate that the mixed convection flow field is characterized by the inertial force from the inlet, the buoyancy force due to the temperature difference, and the dissipation effect of the perforated plate. For a larger Eu, the temperature uniformity of the test zone is greatly improved, and the average RMS temperature fluctuation also decreases. The dimensionless height of the plenum h has little effect on the development of the buoyant jet. The average temperature deviation and RMS temperature fluctuation exhibits a slight decrease with increasing h.

通过实验和数值方法研究了带有穿孔板的大型热循环室内的横向浮力射流引起的混合对流。平均温度分布和温度波动是在冷却和加热条件下通过实验获得的。通过使用低Rek-ε模型求解雷诺平均Navier-Stokes（RANS）方程进行数值模拟。采用基于压力损失类比的修正体力来描述通过多孔板的流动特性。求解一个附加的输运方程，以确定温度波动的均方根（RMS）。所提出的数值方法得到了实验数据的验证。流场，平均温度分布，Eu和增压室的无量纲高度h。结果表明，混合对流流场的特征在于入口惯性力、温差浮力和多孔板的耗散效应。对于较大的Eu，测试区的温度均匀性大大提高，平均RMS温度波动也减小。增压室的无量纲高度h对浮力射流的发展影响不大。平均温度偏差和 RMS 温度波动随着h 的增加而略有下降。