發(fā)布時(shí)間：2018-01-01 14:04

  本文關(guān)鍵詞：葉輪外徑對(duì)前彎型液力透平性能的影響　出處：《機(jī)械工程學(xué)報(bào)》2016年22期 　論文類(lèi)型：期刊論文

  更多相關(guān)文章： 液力透平 數(shù)值計(jì)算 反轉(zhuǎn) 前彎型葉片 葉輪外徑

【摘要】：為研究前彎型葉輪外徑對(duì)液力透平水力性能的影響,進(jìn)行試驗(yàn),獲得了液力透平外特性數(shù)據(jù),與計(jì)算流體動(dòng)力學(xué)(Computational fluid dynamics,CFD)的結(jié)果進(jìn)行對(duì)比分析,發(fā)現(xiàn)兩者結(jié)果十分接近,驗(yàn)證了CFD模擬的準(zhǔn)確性。利用CFD技術(shù)獲得了215 mm、235 mm和255 mm葉輪外徑液力透平的外特性曲線(xiàn),發(fā)現(xiàn)隨葉輪外徑的增加,高效點(diǎn)向大流量區(qū)域偏移,在大流量區(qū)域,揚(yáng)程大幅下降,軸功率小幅提升,效率有較明顯提升,在小流量區(qū)域,揚(yáng)程上升,軸功率略微下降,效率下降明顯。對(duì)215 mm、235 mm和255 mm外徑葉輪的速度場(chǎng)分析,發(fā)現(xiàn)隨葉輪外徑的增加,葉輪與蝸殼基圓之間的循環(huán)流量逐漸減小,流動(dòng)狀態(tài)得到明顯改善,葉輪內(nèi)水力損失也有較為明顯的減小。利用理論公式推測(cè)改變了葉輪外徑后的液力透平的高效點(diǎn)參數(shù),發(fā)現(xiàn)普遍高于CFD模擬結(jié)果,分析產(chǎn)生差值的可能原因。對(duì)液力透平的軸功率、揚(yáng)程進(jìn)行理論分析,探討其隨葉輪外徑增加的變化趨勢(shì)。
[Abstract]:In order to study the influence of the outer diameter of the forward curved impeller on the hydraulic performance of the hydraulic turbine, the external characteristic data of the hydraulic turbine were obtained. Comparing with the results of Computational fluid Dynamics (CFD) and Computational fluid dynamic (CFDs), it is found that the two results are very close to each other. The veracity of CFD simulation is verified. The external characteristic curves of outer diameter hydraulic turbine of 215mm / 235mm and 255mm impeller are obtained by CFD technique, and it is found that the outer diameter of impeller increases with the increase of the outer diameter of impeller. The high efficiency point shifts to the large flow area, in the large flow area, the head greatly drops, the shaft power increases slightly, the efficiency has obvious enhancement, in the small flow area, the lift rises, the axis power drops slightly. The analysis of the velocity field of 215mm / 235mm and 255mm outer diameter impellers shows that the circulation flow between the impeller and the base circle of the volute decreases with the increase of the outer diameter of the impeller. The flow state is obviously improved and the hydraulic loss in the impeller is obviously reduced. The high efficiency point parameters of the turbine after changing the outer diameter of the impeller are estimated by using the theoretical formula. It is found that it is generally higher than the result of CFD simulation. The possible causes of the difference are analyzed. The shaft power and the head of the hydraulic turbine are analyzed theoretically, and the variation trend with the increase of the outer diameter of the impeller is discussed.
【作者單位】： 江蘇大學(xué)國(guó)家水泵及系統(tǒng)工程技術(shù)研究中心;
【基金】：江蘇省青年科學(xué)基金資助項(xiàng)目(BK20130517)
【分類(lèi)號(hào)】：TK05
【正文快照】： 0前言1 隨著社會(huì)經(jīng)濟(jì)的高速發(fā)展,我國(guó)能源需求急速增加,建造小型水電站可以減輕愈發(fā)嚴(yán)重的能源危 機(jī)[1]。液力透平具有價(jià)格便宜、安裝方便、更換易損件容易和維護(hù)成本低等優(yōu)點(diǎn),因而較為廣泛地應(yīng)用在小水電站中[2]。 國(guó)外學(xué)者起步較早,PUNIT等[3]主要采用試驗(yàn)的方式,在現(xiàn)有

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