Research On Heat Dissipation Performance Of Wind Turbine Nacelle

In recent years,more and more attention has been paid to the heat dissipation problem of wind turbine cabin,which has brought severe challenges to people.Due to the limited space size in the cabin,many high-temperature heat sources and parts,such as gearbox,generator,radiator and electric control cabinet,are arranged in a small space,the temperature of the overall or local area is too high in the cabin,it is commonly adopted for limiting power operation or stopping waiting,and the sensitive parts in the cabin will also be affected by high temperature,resulting in failure or damage.In this paper,the model of wind turbine cabin provided by a company is taken as the research object,on the basis of theoretical analysis and reasonable assumptions of the calculation model,the Realizable k-? model and SIMPLE method are used to simulate the air flow and heat dissipation characteristics in the cabin,and the flow field in different positions in the cabin and the temperature distribution on the surface of the heat-generating components are obtained,and the factors that affect the temperature distribution and the unreasonable distribution of the flow field are studied,put forward a reasonable improvement plan,in order to ensure that all components of the wind turbine cabin work in the best temperature range.The main contents of this paper are as follows: the simplified geometric model for the cabin structure and the main heating components the interior is established by using the three-dimensional software,and the calculation domain is determined,and the reasonable mesh is divided,the boundary conditions of the simulation are set by the actual measured data,the flow field and temperature field in the cabin were numerically simulated to simulate the thermal environment in the cabin;The flow field distribution of critical sections and the temperature distribution of on the surface of the heat-generating components are obtained,according to the results of the calculation,the factors that affect the heat dissipation and the irrational flow of the gas in the original design were found;The influence of inlet velocity,inlet temperature and heat generated by the surface of gearbox on the surface temperature of the gearbox was studied,and then a feasible improvement scheme was proposed in terms of improving the air intake in the cabin;And the numerical simulation is carried out again for the improved scheme,and compared with the analysis results of the original model.It is known that the air flow velocity in the cabin is increased,the cold air is increased,the heat exchange of the cold and hot air is strengthened,the overall temperature and local temperature in the cabin are obviously decreased,so that the temperature in the cabin can reach a more uniform level,and the temperature distribution of the main heating parts in the cabin is expected,especially the surface temperature of the gearbox,so that the entire cabin reached acceptable ventilation level.