王振, 吴炜, 杨先勇, 安一峰, 刘元春. 柴油机舷侧排气喷淋流动及传热模拟[J]. 中国舰船研究, 2019, 14(5): 36-41. DOI: 10.19693/j.issn.1673-3185.01458
引用本文: 王振, 吴炜, 杨先勇, 安一峰, 刘元春. 柴油机舷侧排气喷淋流动及传热模拟[J]. 中国舰船研究, 2019, 14(5): 36-41. DOI: 10.19693/j.issn.1673-3185.01458
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Wang Zhen, Wu Wei, Yang Xianyong, An Yifeng, Liu Yuanchun. Numerical simulation for flow and heat transfer of side exhaust spray of marine diesel engines[J]. Chinese Journal of Ship Research, 2019, 14(5): 36-41. DOI: 10.19693/j.issn.1673-3185.01458
Citation: Wang Zhen, Wu Wei, Yang Xianyong, An Yifeng, Liu Yuanchun. Numerical simulation for flow and heat transfer of side exhaust spray of marine diesel engines[J]. Chinese Journal of Ship Research, 2019, 14(5): 36-41. DOI: 10.19693/j.issn.1673-3185.01458
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柴油机舷侧排气喷淋流动及传热模拟

Numerical simulation for flow and heat transfer of side exhaust spray of marine diesel engines

    摘要
  • 摘要:
      目的  为解决船用柴油机舷侧排气喷淋装置的降温效果评估问题，
      方法  应用Mixture多相流模型和蒸发—冷凝模型，对排气管内喷淋的流动和传热过程进行数值模拟，得到并分析不同冷却水量比下排气温度场分布、排气管截面平均温度的沿程变化规律以及压力损失。
      结果  研究结果表明：喷淋条件下，由于水的挤压和水—气传热传质，排气管内的高温核心区呈锥形，随着冷却流量比的增大，排气高温核心区的范围逐渐缩小；从无量纲沿程距离0.1~0.4，排气管截面平均温度急剧下降，之后排气管截面平均温度变化趋缓；总压损失与冷却流量比呈现非单调关系，对排气阻力的影响较小。
      结论  研究结果可为舷侧排气喷淋装置的优化设计提供定量支撑。

     

    Abstract:
      Objectives  In order to solve the problem of evaluating the cooling performance of the side exhaust spray devices for marine diesel engines,
      Methods  the Mixture multiphase flow model and evaporation-condensation model were coupled to simulate the flow and heat transfer process of spray in the exhaust pipe numerically. The distribution of exhaust temperature field, the variation of average sectional temperature along the exhaust pipe and the pressure loss under different cooling water flow ratio were obtained and analyzed.
      Results  The simulation results show that, under spraying conditions, the high temperature zone in the exhaust pipe is conical due to the compressing of water as well as the gas-water mass and heat transfer. With the increase of the cooling flow rate ξ, the range of the high temperature zone is gradually narrowed. Along the exhaust pipe, the exhaust mixing temperature drops sharply from the dimensionless downstream distance χ=0.1 to χ=0.4, and afterwards, the temperature change slows down. The relationship between the total pressure loss and the cooling water flow rate is non-monotonic, and the influence on the exhaust resistance is small.
      Conclusions  The results can provide quantitative support for the optical design of the side exhaust spray devices.

     

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