三轴承推力矢量喷管推力性能试验研究

Test Study on Thrust Performance of 3-bearing Swivel Duct Nozzle

针对三轴承推力矢量喷管推力测量的需求,介绍了自行搭建的六分力测量试验台的原理及特点,采用可变角度排气结构消除排气干扰,采用对称并垂直进气方式与非接触密封结构相组合以消除进气附加气动力,根据六分力测量台架特点开发线性解耦算法并应用于矢量推力数据处理。获取不同落压比下矢量推力随偏转角度的变化情况,并进行了不确定度分析。结果表明:采用解耦算法后将试验台六分力测量的耦合误差减小到约1%;三轴承推力矢量喷管偏转角度减小时矢量推力损失也减小;当偏转角度大于60°时,推力损失变大;随着偏转角度的增大,轴向力减小,俯仰力增大,且推力偏转角与三轴承推力矢量喷管偏转角一致。将试验结果与相关研究结果进行对比,二者的变化规律相同。

According to the thrust measurement requirements of 3-bearing swivel duct nozzle,the principle and characteristics of the self-built 6-component-force test-rig were introduced.The variable angle exhaust structure was developed to eliminate exhaust interfer⁃ence.The symmetrical and vertical air inlet mode was combined with the non-contact sealing structure to eliminate the additional aerody⁃namic force of the air inlet.According to the characteristics of 6-component-force test-rig,a linear decoupling algorithm was developed and applied to vector thrust data processing.The variation of vector thrust with different deflection angle and nozzle pressure ratio was ob⁃tained and the uncertainty was analyzed.The results show that the coupling error of the 6-component-force test-rig is reduced to about 1%by using the decoupling algorithm.The vector thrust loss is small when the 3-bearing swivel duct nozzle deflection angle is small,and the thrust loss becomes larger when the deflection angle is greater than 60°.With the deflection angle increases,the axial force decreased and the pitching force increase,and the thrust deflection angle is consistent with the 3-bearing swivel duct nozzle deflection angle.Comparing the test results with the relevant research results,it is found that the variable regularity is the same.