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舰艇排烟红外辐射特性是影响舰艇隐身性能的关键因素,采用有效冷却技术降低烟囱排烟红外辐射强度,对于提高舰艇海上生存能力有重要意义。为分析细水雾喷射方案对烟囱排气烟羽温度的冷却效果,采用湍流大涡模拟方法对舰艇烟囱的排烟-水雾流动过程进行了数学建模与仿真计算,分析了排烟热气流对水滴到达壁面能力和蒸发过程的影响。在水滴蒸发和排烟浮升作用影响下,细水雾和热烟气在烟囱内部的运动是一种多相、瞬时的湍流流动,根据动量、能量和质量交换规律建立了水雾在排烟中的蒸发和运动方程,研究了水滴直径与流量对烟囱壁内热烟气下沉区域大小和流场分布参数的影响,分析并得到关于水流量、水滴直径等控制参数与排烟冷却温度之间的定量关系。研究结果对于烟囱排烟或其他排气烟羽冷却方案的选择和优化有一定参考价值。
The infrared radiation characteristics of the ship smoke are the key factors that affect the stealth performance of the ship. The effective cooling technology can reduce the intensity of the infrared radiation of the smokestack, which is of great significance for improving the survivability of the ship at sea. In order to analyze the cooling effect of the water mist spray scheme on the chimney exhaust plume temperature, the turbulent large eddy simulation method was used to simulate the smoke-water mist flow process of the ship’s chimney. Impact on water droplet reach wall ability and evaporation process. Under the influence of water vapor evaporation and smoke rising and falling, the movement of water mist and hot flue gas inside the chimney is a multi-phase and transient turbulent flow. According to the law of momentum, energy and mass exchange, The effects of water droplet diameter and flow rate on the size and distribution of flow field of hot flue gas in the chimney wall were studied. The control parameters such as water flow, water droplet diameter, The quantitative relationship. The research results have some reference value for the selection and optimization of chimney exhaust smoke or other exhaust plume cooling schemes.