平面磨床主轴优化及容量设计技术的研究

EXPERIMENTAL STUDY ON HEAT TARNSFER NAD PRESSURE DROP CHARACTERISTICS FOR FIN-AND-TUBE HEAT EXCHANGERS

从平面磨床ＣＡＤ的需要出发，研究了两项高新技术。提出了“卸积木式”力学模型。通过对该模型的求解和参数优化，实现磨床主轴的体积和刚度优化。提出了新的变量设计方法──变量推理法。在自动建立变量设计模型基础上，以尺寸驱动可自动得到新的设计图样，特别适用于优化设计，修改设计及系列化设计。研究成果具有普遍意义。

The heat transfer and pressure drop characteristics for four types of plate fin - and - tube heat exchangers widely used in air conditioning industry in China are inventiguted experimentally. The airside heat transfer and pressure drop correlations are obtained in the Reimolds number range from 5 × 102 - 5 × 103 , which is commonly en- countered in industrial application . A comprehensive analysis and evaluation of heat transfer performance are per- forrned.It is believed that the correlations and the perforrnance evaluation results presented will be very helpful in the optimum design of heat exchangers .