本文選題：泵 + 葉輪�。� 參考：《農(nóng)業(yè)工程學(xué)報》2017年09期

【摘要】：余熱排出泵長期在高溫高壓環(huán)境下運行,其結(jié)構(gòu)的可靠性對整個機組的安全運行有著重要的影響。該文采用單向流固耦合方法研究了幾種常用材料及增加葉輪蓋板厚度對轉(zhuǎn)子結(jié)構(gòu)動力學(xué)特性的影響,同時對比了常溫和高溫下葉輪的振動特性。結(jié)果表明,余熱排出泵高溫運行時,葉輪的第1階固有頻率為394.17 Hz,較常溫下升高了2.28%,遠高于葉輪葉片通過頻率。在各階模態(tài)振型下,1Cr13MoS葉輪固有頻率最大,ZG225-450葉輪固有頻率最小。設(shè)計工況和偏工況下葉輪的應(yīng)力及變形變化趨勢基本一致,葉輪的變形隨半徑的增加而不斷增大,最大變形量出現(xiàn)在后蓋板葉輪出口處。葉輪的應(yīng)力分布不均,最大應(yīng)力均出現(xiàn)在葉片尾緣與后蓋板接合處。沿著前蓋板和葉片接合線,應(yīng)力的峰值隨前蓋板厚度增加而減小。沿著后蓋板和葉片接合線,增加后蓋板厚度明顯減小了應(yīng)力峰值。高溫和常溫應(yīng)力變化趨勢基本一致,但是高溫下葉輪應(yīng)力明顯高于常溫。尤其在葉輪進口處附近,高溫應(yīng)力相對于常溫應(yīng)力增加超過300%。該研究結(jié)果為下一步進行更加復(fù)雜的動力學(xué)分析、疲勞分析以及結(jié)構(gòu)優(yōu)化提供參考。
[Abstract]:The residual heat discharge pump is operated under high temperature and high pressure for a long time. The reliability of its structure has an important effect on the safe operation of the whole unit.In this paper, unidirectional fluid-solid coupling method is used to study the effects of several common materials and increasing the thickness of impeller cover on the dynamic characteristics of rotor structure, and the vibration characteristics of impeller at room temperature and high temperature are compared.The results show that the first natural frequency of the impeller is 394.17 Hz when the waste heat discharge pump is running at high temperature, which is 2.28% higher than that at normal temperature, and far higher than the passing frequency of impeller blade.The maximum natural frequency of 1Cr13MoS impeller and the minimum natural frequency of ZG225-450 impeller are obtained under various modes.The variation trend of the stress and deformation of the impeller under the design and off-load conditions is basically the same. The deformation of the impeller increases with the increase of the radius, and the maximum deformation appears at the outlet of the impeller with the back cover plate.The stress distribution of the impeller is uneven, and the maximum stress occurs at the junction between the trailing edge of the blade and the back cover plate.Along the front cover plate and blade joint line, the peak stress decreases with the increase of the front cover plate thickness.Along the joint line between the back cover plate and the blade, the stress peak value is obviously reduced by increasing the thickness of the back cover plate.The variation trend of high temperature and room temperature stress is basically the same, but the impeller stress at high temperature is obviously higher than that at room temperature.Especially near the impeller inlet, the high temperature stress increases by more than 300 relative to the normal temperature stress.The results provide a reference for further complex dynamic analysis, fatigue analysis and structural optimization.
【作者單位】： 江蘇大學(xué)國家水泵及系統(tǒng)工程技術(shù)研究中心;
【基金】：國家科技支撐計劃項目(2014BAB08B01) 國家自然科學(xué)基金青年基金(51409123) 江蘇省自然科學(xué)基金青年基金(BK20140554) 江蘇大學(xué)“青年骨干教師培養(yǎng)工程”
【分類號】：TM623

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