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针对背负式发动机舱的工作条件,建立三维空气流动与传热的物理和数学模型。根据舱内结构和气流的流动特点,通过多面体网格技术和网格自适应技术进行区域离散化,采用标准k-ωSST湍流模型,对4种工况下喷管引射和无引射状态进行数值仿真,分析了舱内各典型特征截面的温度场分布、冷却气流流动情况。结果表明,发动机地面以最大状态开车时,对发动机舱的引射作用影响显著,附件工作区域温度值相比较无引射状态时低40℃左右,计算结果对发动机舱通风冷却系统设计提供一定的科学依据。
Aiming at the operating conditions of knuckleboat engine compartment, a physical and mathematical model of three-dimensional air flow and heat transfer is established. According to the flow characteristics of the structure and the airflow in the chamber, the regional discretization was carried out by using the polyhedral mesh technology and the grid adaptive technique. The standard k-ωSST turbulence model was used to conduct the nozzle ejection and the non-ejection state under the four conditions Numerical simulation is carried out to analyze the distribution of temperature field and flow of cooling air in each typical section of cabin. The results show that when the engine ground is driven at the maximum condition, it has a significant effect on the launch of the engine compartment. The temperature value in the working area of the attachment is about 40 ℃ lower than that of the non-induced condition. The calculation results provide a certain degree of design for the ventilation and cooling system of the engine compartment. Scientific basis.