双喷口射流冲击高速旋转圆盘的传热研究

To analyze the influence of jet temperature， disk rotating speed， jet flow and disk temperature on the heat transfer of rotating disk，the two-phase flow and heat transfer characteristics of the lubricating oil jets from the twin nozzles impinging on a high-speed rotating disk were studied by numerical simulation. The results show that the jet temperature increases from 323 K to 423 K， which increases the average Nusselt number by 28.54%. When the rotational speed of the disk surface is increased from 4 000 r/min to 10 000 r/min， the average Nusselt number of the surface decreases by 10.61% with the increase of the rotational speed，but the influence of the rotational speed on the effective heat transfer area is limited. Therefore，the average Nusselt number rises again under the condition of 12 000 r/min. The increase of the jet flow rate effectively increases the flow rate of the oil film on the disc. As the jet flow rate increases from 0.5 L/min to 2.5 L/min，the average Nusselt number increases by 152.06%. As the temperature of the disk surface increases from 423 K to 723 K， the heat transfer effect at the same position on the disk surface is significantly enhanced， and the average Nusselt number on the surface increases by 117.34%. Finally，based on the jet Reynolds number，rotational Reynolds number and Prandtl number，the dimensionless correlation of the surface average Nusselt number is established.