求助fluid stiffening effects 的意思? 经国外朋友的解释,是api 610里面的内容: in simple terms, the interstage bushings (in particular) and the wear rings etc of a multistage pump act in a manner somewhat similar to lubricated bearings. the pumped fluid present in these relatively close tolerance areas has a stiffening effect on the shaft. (the fluid in the gaps dampens movement). the larger the clearances the less effective is this dampening effect (fluid stiffening of the system), so api 610 requires that this effect be adequate at both normal and 2x normal clearances.查看更多