舰船科学技术  2022, Vol. 44 Issue (8): 95-98    DOI: 10.3404/j.issn.1672-7649.2022.08.019 PDF

Numerical simulation and analysis of thermal environment of marine diesel engine room based on CFD
RAN Jun-jun, YUAN Lei
The Engineering and Technical College, Chengdu University of Technology, Leshan 614000, China
Abstract: Diesel engine is an important equipment in the engine room of the ship, and it is also the power source of the ship's navigation. The diesel engine will generate a large amount of heat during the operation process, which makes the thermal environment of the engine room become the key monitoring object of the ship. With the development of computer technology, it is necessary to use CFD to simulate the temperature field value in the thermal environment monitoring of the engine room, so as to provide a basis for the ventilation design of the ship engine room. This paper starts with an overview of the concept and model of CFD, analyzes the numerical simulation process of thermal environment of marine diesel engine room based on CFD, establishes a numerical model of thermal environment, and experimentally tests the operation of the engine room thermal environment monitoring system, in order to optimize the engine room equipment operating environment to provide simulation data.
Key words: CFD     marine diesel engine     engine room     thermal environment
0 引　言

1 CFD模型 1.1 CFD概述

1.2 建立CFD模型

 $\frac{{\delta \rho }}{{\delta \rho }} + \frac{{\delta (\rho \mu )}}{{\delta x}} + \frac{{\delta (\rho v)}}{{\delta y}} + \frac{{\delta (\rho w)}}{{\delta z}} = 0 \text{。}$

 $\frac{{\delta \rho }}{{\delta \rho }} + \frac{k}{{{C_p}}} + {S_T} = 0 \text{。}$

 ${\mu _t} = {C_\mu }\rho {K^2}/\varepsilon \text{。}$

 $r_{u,v}^{(\alpha )}(n) = {e^{j\alpha n}}{\bar r_{u,v}}(n) \text{。}$

 ${x_k} = f\left( {{x_{k - 1}},{v_{k - 1}}} \right) \text{，}$
 ${z_k} = h\left( {{x_k},{n_k}} \right) \text{。}$

2 基于CFD的舰船柴油机机舱热环境数据模拟 2.1 机舱数据

 图 1 舰船柴油机机舱设备与位置俯视图 Fig. 1 Top view of equipment and location of marine diesel engine room
2.2 模拟过程

2.3 热环境数值模型

2.4 确定舱内温度场

 图 2 舰船柴油机机舱热环境模拟在y=0条件下的切面速度等值线 Fig. 2 Tangential velocity contour of thermal environment simulation of marine diesel engine room under the condition of y = 0

 图 3 舰船柴油机机舱热环境模拟在Z=0.8条件下的切面速度等值线 Fig. 3 Sectional velocity contour of thermal environment simulation of marine diesel engine room under the condition of Z = 0.8

3 舰船柴油机机舱热环境监测实验分析 3.1 实验设备

3.2 实验条件

3.3 实验结果分析

 图 4 舰船柴油机机舱环境示值误差变化图 Fig. 4 Variation diagram of environmental indication error of marine room diesel

 图 5 舰船柴油机机舱测温系统实测值曲线图 Fig. 5 Measured value curve of marine diesel engine room temperature measurement system

 图 6 机舱热环境测温二次仪表温度实测值曲线图 Fig. 6 Curve of measured temperature of secondary instrument for measuring temperature in thermal environment of engine room
4 结　语

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