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Simulation of critical inlet angle of inner conical hollowprojectile under choke flow(PDF)


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Simulation of critical inlet angle of inner conical hollowprojectile under choke flow
Du Hongbao1Jiang Feng2Huang Zhengui1Chen Zhihua1Sun Xiaohui3
1.National Key Laboratory of Transient Physics,Nanjing University of Science and Technology,Nanjing 210094,China; 2.Shanghai Academy of Spaceflight Technology,Shanghai 201109,China; 3. School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China
computational fluid mechanics inner conical hollow projectile choke critical inlet angle exhaustive method
The influence of the inlet angle θ on the fluid field of an inner conical hollow projectile is simulated to study the relationship between the choking and the inlet angle. In the condition of the area ratio of throat to entrance of 0.6,the research is based on the Reynolds-averaged Navier-Stokes(RANS)equation and the one-equation Spalart-Allmaras(S-A)turbulence model. The numerical simulation of the ramp flow field is carried out and compared with the experimental results,and the accuracy of the method proposed here is verified. Under the condition of θ=10 ° and θ=30 °,the flow fields of the hollow projectile at Ma=2.5 are simulated by using this method,and the inlet angle is an important factor on the choking of the air flow in projectiles. The flow fields at θ=10°~30° and Ma=2.5 are calculated by using the exhaustive method,and the results show the critical inlet angle of choking is θ0=17.8°. The θ0 at Ma=2~4 is simulated,and the results show θ0 increases with the increasing Ma.


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Last Update: 2018-12-30