| XU Xue1，LI Hong-xin 1，2 ，FENG Guo-quan 1，.Study on Mesh and Time Step of Explicit Dynamic Simulation for Fan Blade Out[J].航空发动机,2021,47(5):12-18 |
| Study on Mesh and Time Step of Explicit Dynamic Simulation for Fan Blade Out |
| DOI： |
| Key Words:fan blade out explicit dynamic transient dynamic mesh size time step aeroengine |
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| Abstract:In order to study the influence of mesh scale and time step on the results of transient explicit dynamic analysis for the fan
blade out simulation of high bypass ratio turbofan engine，the theoretical relationship between mesh scale and time step in computational
stability was analyzed by using the method of element calculation theoretical analysis in finite element method. The multiple parameters
test design method was used to organize the research scheme on the influence of mesh scale and time step of three typical output parameters
of fan blade out，including blade stress distribution，rotor axis trajectory and transmitted vibration stress outside the fulcrum. The research
on the independence of typical physical process，model simplification and numerical calculation was carried out. The calculation results
with time step of 7×10-7、5×10-7 、3×10-7and 2×10-7 s and mesh scale of 40、30、20、15 mm were analyzed. The results show that for a given
physical process and target time，there are threshold values of mesh scale and time step，such as 2×10-7 s time step and 30 mm mesh scale.
Beyond this value，further refining the mesh and reducing the time step are not obvious for the improvement of accuracy. The calculation
principle of explicit dynamics determines that the longer the target time is，the greater the deviation accumulation is，and the higher the
mesh accuracy is required. The impact and wear process has a great influence on the stress response and vibration transmission of fan blade
out simulation. |
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