In this paper, a three dimensional Computational Fluid Dynamics Model (CFD) model was generated for spray cooling of straight parts by using a single point nozzle. The numerical simulations of spray quenching were performed to investigate the cooling rate of a 22MnB5 hot steel blank commonly used material in the automotive industry. Experiments are carried out to examine infrared thermograph of hot steel blank surfaces during spray cooling process by using infrared thermal camera. Time dependent situations of surface temperatures, surface heat fluxes and cooling areas are investigated numerically. The 3D model with some assumptions is presented to improve the solution of numeric simulation and to meet the most appropriate acceptable results for spray cooling process. The developed 3D model will be used to investigate the heat transfer analysis of hot stamped parts during hybrid quenching to optimize the process parameters. The comparison of the numerical and experimental results showed that the presented approach can be effectively used to evaluate heat transfer during spray quenching with a single nozzle. With this research, it was clearly seen that the estimated cooling rates and the temperatures were in good agreement with the experimental cooling temperature data. By using the numerical results and experimental data obtained in this study, multi-nozzle spray apparatus which will be used to obtain different cooling rates on the parts by changing spray parameters such as spray height, spray angle, mass flow rate, the distance between nozzles and part etc. was developed for hybrid quenching process.

在本文中，使用单点喷嘴生成了三维计算流体动力学模型（CFD）模型，用于对直零件进行喷雾冷却。进行了喷雾淬火的数值模拟，以研究汽车工业中常用的22MnB5热钢毛坯的冷却速率。通过使用红外热像仪进行了实验，以检查喷雾冷却过程中热钢坯表面的红外热像图。数值研究了表面温度，表面热通量和冷却面积随时间变化的情况。提出了带有一些假设的3D模型，以改善数值模拟的解决方案，并满足喷雾冷却过程最合适的可接受结果。开发的3D模型将用于研究混合淬火过程中热冲压零件的传热分析，以优化工艺参数。数值和实验结果的比较表明，所提出的方法可以有效地用于评估单喷嘴喷雾淬火过程中的传热。通过这项研究，可以清楚地看到估计的冷却速率和温度与实验冷却温度数据非常吻合。通过使用本研究中获得的数值结果和实验数据，多喷嘴喷涂设备将用于通过更改喷涂参数（例如喷涂高度，喷涂角度，质量流量，喷嘴之间的距离）来获得零件的不同冷却速率。开发了零件等用于混合淬火工艺。