壁厚分布对金属隔膜翻转偏心行为的影响研究

Effects of Wall Thickness Distribution on Overturning Eccentricity Behavior of Metal Diaphragm

为确保金属隔膜的有序翻转,实现贮箱质心规则变化和推进剂均衡排放,研究分析了壁厚分布对金属隔膜翻转偏心行为的影响。结果表明:对于等壁厚隔膜,锥壳和球冠具有一定的纠偏能力,过渡球壳不具有纠偏能力。采用过渡球壳均匀变壁厚方案,通过增大偏向段和偏离段翻转启动压力差ΔP_(r),促使偏离段较小的轴向分力P_(y)优先达到翻转启动压力P_(r),进而提升过渡球壳纠偏能力,以更小的壁厚梯度和更低的重量代价实现隔膜翻转不偏心。

In order to ensure the orderly overturning of metal diaphragm,and realize the regular change of tank and the balanced discharge of propellant,the effects of wall thickness distribution on overturning eccentricity of metal diaphragm was analyzed.The results showed that for the diaphragm with equal wall thickness,conical shell and spherical crown had a certain ability to correct eccen-tricity,transitional spherical shell did not have a certain ability to correct eccentricity.The conical shell variable wall thickness schemes can promote the smaller axial component force P_(y) of the devia-tion section to achieve the overturning starting pressure P_(r) in advance by increasing the pressure difference ΔP_(r) with smaller wall thickness gradient and lower weight cost,thereby improving the cor-rect eccentricity and realize the overturning without eccentricity.