Roller bearings, gear, and so on accuracy and impression institutions, ink institutions is particularly important for reliability.

滾筒軸承国产欧美日韩永久、傳不靜齒輪等的增工精度及聚散不抬機構、勻不朱機構等的可靠性尤為輕給A片不卡在线播放。

It is available to carry out numerical simulation and fluid dynamic analysis further. Based on Frozen-Rotor Approach and Rotor-Stator Approach, the numerical simulation was carried out in the centrifugal pump and the numerical results showed that the flow in the impeller and volute of centrifugal pump is periodically unsteady. Due to the interaction between impeller and volute the flow is characterized by pressure fluctuations and it is the strongest at impeller outlet and at the vicinity of the tongue. The unsteady pressure fluctuations are also one of the most important reasons to induce vibration and noise. Secondly, the flow field of the volute is characteristic of the vortex flow, and the vortex flow presents very complicated developing process which is creating, increasing and dissipating every now and then. All these lead to very large flow loss in the volute.

采用Frozen-Rotor凍結轉子模式和Rotor-Stator滑移界面模式系統(tǒng)開展了不同工況下離心泵內葉輪與蝸殼耦合的定常和非定常流動研究狂野欧美性爱一区二区三区在线播放，結果表明由于葉輪與蝸殼的干擾蝸殼進口周向流動的不均勻性是非常強烈的，特別是葉輪與蝸舌間的相互干擾最為強烈久草视频15，一直影響到葉輪進口和蝸殼擴散管出口的流場youjizzcom中国妇女；在蝸殼內整個流動是以旋渦形式向出口推進的，并隨著包角的變化旋渦表現(xiàn)出十分復雜的產生免费毛片不卡、發(fā)展和耗散的演化過程国产'a片视频，導致蝸殼內較大的流動損失。