Simulation and testing of key components of wind tunnel for rapeseed lodging resistance testing
Wind tunnel devices play an important role in studying the lodging resistance of rapeseed in strong wind environments.The wind tunnel model of rapeseed lodging resistance test was established based on computational fluid dynamics software Fluent.The design of parameter and simulation tests on key parts of the wind tunnel including diffusion section,stabilization section and contraction section were conducted.The effects of key parts of the wind tunnel on the quality of the wind tunnel flow field were analyzed.The op-timal design scheme was selected with orthogonal experiments.The results showed that the variation coeffi-cient of wind velocity at the outlet of the wind tunnel increased when the length of the shrinkage section Ls in-creased,and the quality of airflow decreased in the single factor experiment.As the length of the stable sec-tion Lw increased,the coefficient of variation of wind tunnel outlet wind speed first decreased and then in-creased.When Lw was 1 000 mm,the coefficient of wind speed variation was the lowest and the airflow quali-ty was the best.The wind speed variation coefficient of wind tunnel outlet first decreased and then increased with the increase of the outlet length of the stabilization section of the damping net distance.When the damp-ing net was 0.65Lw away from the wind tunnel outlet,the variation coefficient of wind speed was the small-est.Among the 9 orthogonal experimental schemes,when the shrinkage section length was 600 mm,the sta-bilization section was 800 mm,and the damping net was 0.65Lw away from the wind tunnel outlet,the aver-age variation coefficient of wind speed in the corresponding wind tunnel test area was 0.139.The wind speed was more stable than other schemes,and the airflow quality was the best.It is indicated that there is no signif-icant difference between the measured wind speed and the simulation value in scheme 2 wind tunnel.It will provide data support and proof for the design of wind tunnel.
NETL
NSTL
万方数据
维普
