板翅式换热器正交接管封头塑性压力研究

针对板翅式换热器正交接管封头的强度设计问题,给出了基于比率塑性功曲率(Ratio plas-tic work curvature,RPWC)准则塑性压力计算方法,并利用弹性应力分析设计准则对封头在许用压力作用下的强度校核。对某工业封头的塑性压力及其许用压力算例分析表明,比率塑性功曲率峰值确定RPWC准则塑性压力具有唯一性,克服了两倍弹性斜率准则需凭经验选择变形参数的缺点;许用压力作用下的封头强度满足弹性应力分析设计准则。基于RPWC准则的方法是板翅式换热器正交接管封头塑性压力计算的有效方法。

Research on the Plastic Limit Pressure of the Plate - Fin Heat Exchanger Header with Radial Nozzle

To investigate the strength design of the plate - fin heat exchanger header with radial nozzle, the calculation procedure of plastic pressure based on RPWC criterion （ Ratio Plastic Work Curvature ） is presented, and the strength of the header under allowable pressure is checked by using the elastic stress categorization code. The results＇ of plastic pressure and allowable pressure for the industrial header exam- ple show that the RPWC plastic pressure determined by the curvature peak of ratio plastic work is unique, and the calculation procedure of RPWC plastic load is advantageous of overcoming the dependence prob- lem of TIS （Twice Elastic Slope） criterion on users＇ experience to select an appropriate deformation pa- rameter; the strength of the header under the allowable pressure meets the elastic stress categorization code. The proposed RPWC based calculation method is an effective approach to calculating the plastic pressure of the plate - fin heat exchanger header.