Experimental Study of 2D Adjustable Asymmetric Nozzles
Experimental Study of 2D Adjustable Asymmetric Nozzles
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发表时间：
2013
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通讯作者：
Mo Jianwei
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作者：
Mo Jianwei
本文提出了两种二维可调非对称喷管方案(A方案和B方案)。在不同喷管压比(NPR)下进行了风洞试验，得到了流场的纹影和沿喷管壁面的压力分布。根据风洞试验的边界条件，进行了详细的三维数值模拟，模拟结果与风洞试验结果吻合较好。三维数值模拟结果与风洞试验结果的对比表明，A方案与B方案的推力性能存在差异，B方案(喉部和出口面积可调)的推力性能优于A方案(仅喉部面积可调)，当喷管压比为3.8时，B方案的推力系数比A方案提高8%。
Two adjustable programs(Plan A and Plan B) of a 2D adjustable asymmetric nozzle are presented in this paper.A tunnel test is carried out at different nozzle pressure ratios(NPR),and the schlieren of the flowfield and the distribution of pressure along the nozzle wall are obtained.Based on the boundary conditions of the tunnel test,a detailed 3D numerical simulation is performed,and the results of the simulation are in good agreement with those of the tunnel test,which testifies the validity of the method of numerical simulation.A comparison of the results of 3D numerical simulation and tunnel test reveals the difference of thrust performance between Plan A and Plan B.Plan B(in which the area of throat and outlet is adjustable) is found to be better than Plan A(in which only the area of throat is adjustable) on thrust performance.When the nozzle pressure ratio is 3.8,the thrust coefficient of Plan B increases by 8% over that of Plan A.