波节形状对波节管结构稳定性和传热特性的影响

Effect of shape on structural stability and heat transfer characteristics of corrugated tubes

针对不同形状的波节管的成形精度、结构稳定性以及传热特性差异较大.通过实验研究、理论校核和数值模拟相结合的方法,重点研究不同的波节形状(波谷圆角半径R和波节高度H)对波节管成形精度、轴向补偿能力、平面抗失稳能力以及传热特性的影响规律.研究结果表明:内高压成形波节管的成形精度随着波谷圆角半径R的增大而提高;波节管的轴向位移补偿能力随波节高度H的增加而增大;抗平面失稳能力和抗疲劳能力随波节高度H的增加而降低;综合传热因子η随着波谷圆角半径R增大和波节高度H的增加均是先增大后减小.综合考虑上述各个因素,对于所研究的内高压成形波节管,当波节高度H为2.5 mm,波谷圆角半径R为30 mm时,波节管具备良好的综合特性.

The effect of convolution height and corner located on transition zone on forming precision, axial compensation capacity, anti-instability capacity, and heat transfer characteristics are analyzed one by one in this paper by experiments, theory checking and simulation. The results show that, for hydroformed corrugated tube, with the increase of corner radius there will be a better forming precision; with the increase of convolution height, there will be a good performance on axial compensation capacity and bad performance on anti-instability capacity and anti-fatigue capacity; with the increase of corner radius and convolution height, the comprehensive heat transfer friction are first increase and then decrease. When the convolution height is 2. 5 mm and the corner radius is 30 mm, the hydroformed corrugated tubes have better comprehensive performance.