发电机组通风系统风速场分析OA
Analysis of Airflow Velocity Field in Generator Unit Ventilation System
为评估某发电机组整机流场特性,基于 CFD 方法采用流体分析软件 STAR-CCM+搭建发电机组整机外流场计算模型,对风量分配、部件速度场及截面速度场进行全面分析.结果表明:风扇出风速度较大,冷却风通过风扇罩的导风作用导向到缸头及箱体风道,对发动机进行冷却,发动机散热片处的风速最大可达 10 m/s,箱体底部风速分布较均匀,风速在 6～8 m/s;机组整体流场速度分布均匀,不存在明显的流动死区;发动机(缸头、箱体底部及箱体)表面风速分布均匀,无热风回流现象;电机定子、消声器表面风速分布较好,有利于高温部件的冷却.对机组进风口布置进行了讨论:5 个进风口改为 2 个进风口后,机组总进风量从 75.07 g/s 降至 62.12 g/s,降低了 12.95 g/s,降低了 17.3%;变频器及电机定子表面风速明显增大,发动机及消声器表面风速减小;风口布置对整机流场影响较大,应从机组冷却系统设计需求合理选择进出风口的位置,保证发电机组的冷却.研究结果可为发电机组冷却系统设计及结构改进提供仿真数据支撑及方法参考.
To evaluate the overall flow field characteristics of a generator unit,a calculation model of the external flow field of the entire generator unit was established based on the CFD method using the fluid analysis software STAR-CCM+,and the air volume distribution,component velocity field,and cross-sec-tion velocity field were comprehensively analyzed.The results indicate that the air velocity at the fan outlet is relatively high,and the cooling air is guided to the cylinder head and the crankcase air duct through the air-guiding effect of the fan cover to cool the engine.The maximum airflow velocity at the engine heat sink can reach 10 m/s,and the airflow velocity distribution at the bottom of the crankcase is relatively uniform,with an airflow velocity of 6-8 m/s.The overall flow field velocity distribution of the generator unit is uni-form,and there is no obvious flow dead zone.The airflow velocity on the surface of the engine(cylinder head,crankcase bottom,and crankcase body)is evenly distributed,without hot air backflow.The airflow velocity distribution on the surfaces of the electronic stator and muffler is relatively good,which is condu-cive to the cooling of high-temperature components.The layout of air inlets of the generator unit is dis-cussed.After the five air inlets are changed to two,the total air intake volume of the generator unit de-creases from 75.07 g/s to 62.12 g/s,with a reduction of 12.95 g/s(decreasing by 17.3%).The airflow velo-city on the surfaces of the frequency converter and motor stator increases significantly,while that on the surfaces of the engine and muffler decreases.The layout of air inlets and outlets has a significant impact on the overall flow field.Therefore,the positions of the air inlets and outlets should be reasonably selected based on the design requirements of the cooling system of the generator unit to ensure its cooling.The re-search results can provide simulation data support and method reference for the design and structural im-provement of the cooling system of the generator unit.
谭礼斌;王张钰;袁越锦
四川轻化工大学机械工程学院,四川 宜宾 644005重庆市巫溪县白马中学校,重庆 405899陕西科技大学机电工程学院,陕西 西安 710021
能源科技
发电机组风速场分布数值模拟总风量结构改进冷却性能
generator unitairflow velocity field distributionnumerical simulationtotal air volumestructural improvementcooling performance
《西华大学学报（自然科学版）》 2026 (4)
21-30,38,11
四川轻化工大学人才引进项目(2025RCZ068)国家自然科学基金项目(51876109).
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