| Marine Air Distributor’s main function is to change the air supply volume by adjusting the air flow area at the valve,and to change the airflow organization of the room by using different forms of air outlets,so as to achieve the purpose of adjusting the cabin temperature and humidity and providing a comfortable working environment for the crew.At present,there are two problems with China’s marine air ventilators: excessive resistance and high noise.These problems lead to excessive energy consumption of the air conditioning system and high noise in the cabin environment,which seriously affects the comfort and work efficiency of the crew.These problems are not conducive to the implementation and completion of the "double carbon" policy,nor are they conducive to the creation of pleasant living and working conditions.Therefore,in this thesis,the existing marine air distributor is optimized and improved through a combination of experiments and numerical simulations,and the resistance and noise characteristics of the air blower are studied separately:(1)The relationship between the resistance performance and noise performance of the original marine air distributor and the static pressure of the air supply and the valve opening degree.By adjusting the air volume provided by the air supply,different working conditions are simulated,and experimental measurements are made on the marine air distributor in different working conditions,and experimental data are recorded.The relationship between resistance performance and pneumatic noise performance and inlet static pressure and valve opening is studied.The experimental results show that as the inlet static pressure and valve opening increase,the measured resistance coefficient and pneumatic noise also increase.(2)The experimental results of the original model were verified by numerical simulation under rated conditions(250m3/h,600Pa),which laid the foundation for predicting the optimization results.The results show that when using the Reliable model to predict the flow field resistance performance,the error is 4.1%.When using Fluent’s acoustic module to predict the aerodynamic noise,the error is 7.8%.(3)Two new internal flow channel structures were proposed.The key parameters of the two structures were designed by the orthogonal experimental design method,and the lowrepresentative schemes were screened out.The numerical simulation calculation was performed on the representative schemes,and the optimal key parameters of the two different internal flow channel structures were determined.The simulation results showed that when the L-type marine air distributor was designed with L1=85mm,H=75mm,and L2=65mm,the resistance coefficient decreased to 1.494 and the aerodynamic noise decreased to 39.29 d B(A)under rated conditions.When the U-type marine air distributor was designed with RS=60mm,RL=125mm,D=160mm,and L=100,the resistance coefficient decreased to 1.375 and the aerodynamic noise decreased to 37.31 d B(A)under rated conditions.(4)From the results,it can be seen that the U-type internal flow channel structure has better resistance and noise performance.Compared with the original structure,under rated conditions(250m3/h,600Pa),the resistance decreased by 57.03%,and the aerodynamic noise decreased by 23.87%.The optimization effect is significant.Based on numerical simulation calculations,this thesis optimized the marine air distributor structure.The research results can provide guidance for the production,design,and manufacturing of marine air distributors in the future.It can also achieve the goal of energy saving and emission reduction,and provide a more comfortable living and working environment for cabin personnel. |
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