论文部分内容阅读
运用RANS(数值求解三维)方程和SST(紊流模型)的方法研究了圆孔形预旋喷嘴转静盘腔内流动换热特性。通过数值计算获得的实验测量预旋盘腔内的阻力系数和努赛尔数与实验数据吻合良好,验证了数值方法的有效性。分析了3种不同进气预旋比和湍流系数对圆孔型预旋喷嘴转静盘腔内的流动换热特性的影响。研究结果表明:旋流比、阻力系数和转盘表面换热随着湍流系数的增大而增大。阻力系数由于受旋转泵效应的影响沿径向逐渐增大,受进气影响在进出口附近周向不均匀较为明显。进气预旋比较小时转盘对气流做功提高气流总温,当进气预旋比达到1.5左右时,转盘无需推动气流转动,气流总温相对较低。进气流冲击导致进气位置转盘表面Nu周向分布不均匀,并导致形成转盘表面强换热区。
The flow and heat transfer characteristics of a circular hole prerotating nozzle in a static disk were studied by using the RANS (Three Dimensional Solving) equation and SST (Turbulence Model). The experimental data obtained by numerical calculation are in good agreement with the experimental data. The numerical results are in good agreement with the experimental data. The effects of three different pre-swirl ratios and turbulence coefficients on the flow heat transfer characteristics of a circular pre-swirl nozzle were analyzed. The results show that the swirl ratio, drag coefficient and surface heat transfer increase with turbulence coefficient. The drag coefficient gradually increases in the radial direction due to the effect of the rotating pump, and the circumferential unevenness near the entrances and exits is obviously affected by the intake air. When the intake pre-swirl is relatively small, the turntable does work to improve airflow. When the intake pre-swirl ratio reaches about 1.5, the turntable does not need to push the airflow to rotate, and the total airflow temperature is relatively low. The impact of the intake air flow resulted in uneven circumferential distribution of the turntable surface Nu of the intake air and led to the formation of a strong heat exchange zone on the surface of the turntable.