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

滾筒軸承在线观看无码AV直接进入、傳不靜齒輪等的增工精度及聚散不抬機(jī)構(gòu)最新免费在线黄色网址、勻不朱機(jī)構(gòu)等的可靠性尤為輕給国产精品重口黄金调教系列。

The masons and slaters have left their work and locked up the yard .

瓦匠們?cè)缇蜕⒘斯と毡净粕悠稻镁镁茫压ぷ鲌?chǎng)都上了鎖国产av福利第一精品。

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(jié)轉(zhuǎn)子模式和Rotor-Stator滑移界面模式系統(tǒng)開(kāi)展了不同工況下離心泵內(nèi)葉輪與蝸殼耦合的定常和非定常流動(dòng)研究手机在线视频日韩一区，結(jié)果表明由于葉輪與蝸殼的干擾蝸殼進(jìn)口周向流動(dòng)的不均勻性是非常強(qiáng)烈的，特別是葉輪與蝸舌間的相互干擾最為強(qiáng)烈久久婷婷五月综合国产，一直影響到葉輪進(jìn)口和蝸殼擴(kuò)散管出口的流場(chǎng)5060午夜全黄一级A；在蝸殼內(nèi)整個(gè)流動(dòng)是以旋渦形式向出口推進(jìn)的，并隨著包角的變化旋渦表現(xiàn)出十分復(fù)雜的產(chǎn)生国产精品视频网站大全、發(fā)展和耗散的演化過(guò)程久久免费视频精神品，導(dǎo)致蝸殼內(nèi)較大的流動(dòng)損失。