本文關(guān)鍵詞： 氦氣壓氣機(jī) 新型基元級(jí) 大轉(zhuǎn)折角 高負(fù)荷葉柵 三維級(jí)　出處：《中國(guó)艦船研究院》2011年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：由于工質(zhì)的差異性,采用空氣常規(guī)設(shè)計(jì)方法的氦氣壓氣機(jī)存在單級(jí)壓比過(guò)小的問(wèn)題。經(jīng)驗(yàn)證,適用于氦氣的大轉(zhuǎn)折角葉型葉柵可使級(jí)負(fù)荷成倍增加;氦氣壓氣機(jī)采用新型基元級(jí)設(shè)計(jì)方法,實(shí)現(xiàn)了提高壓比,減少級(jí)數(shù)的目的。 本文采用NUMECA的Fine/turbo軟件包對(duì)5個(gè)參變量組合構(gòu)成的324種新型平面葉柵進(jìn)行了數(shù)值模擬研究,對(duì)結(jié)果數(shù)據(jù)進(jìn)行關(guān)聯(lián)研究,并得到了各參數(shù)反映損失規(guī)律性的最佳方案,在此基礎(chǔ)上,計(jì)算了5個(gè)參量組合下162種新型基元級(jí)的性能。研究結(jié)果表明:常規(guī)設(shè)計(jì)下的擴(kuò)壓因子反映葉柵損失的規(guī)律在高負(fù)荷葉柵下不再適用;相同損失系數(shù)條件下,存在一個(gè)臨界進(jìn)氣角使氣流轉(zhuǎn)折角達(dá)到最大,該臨界進(jìn)氣角幾乎僅與稠度相關(guān);在較大稠度時(shí),葉型最大厚度比變化對(duì)損失的影響十分可觀,應(yīng)用薄葉型很有利;新型基元級(jí)負(fù)荷得到大幅度提升,并且級(jí)效率還能維持在較高的水平。 基于平面葉柵和基元級(jí)數(shù)值計(jì)算數(shù)據(jù),設(shè)計(jì)了高負(fù)荷三維級(jí)和與之對(duì)比的常規(guī)三維級(jí),并進(jìn)行三維級(jí)數(shù)值模擬,模擬結(jié)果顯示:該新型設(shè)計(jì)下的三維級(jí)方案是可行的,一個(gè)高負(fù)荷三維級(jí)設(shè)計(jì)方案:中徑的馬赫數(shù)0.465、能量頭系數(shù)1.0、流量系數(shù)1.141、反動(dòng)度0.5、稠度1.475,設(shè)計(jì)點(diǎn)的級(jí)壓比達(dá)到1.1388,級(jí)效率達(dá)到89.86%,90%設(shè)計(jì)流量點(diǎn)的級(jí)壓比和級(jí)效率為1.137和90.05%,110%設(shè)計(jì)流量點(diǎn)的級(jí)壓比和級(jí)效率為1.139和88.99%,而作為比較的常規(guī)設(shè)計(jì)方案:中徑的馬赫數(shù)0.281、能量頭系數(shù)0.419、流量系數(shù)0.5998、反動(dòng)度0.5、稠度1.475,設(shè)計(jì)點(diǎn)的壓比為1.067,效率為87.78%。
[Abstract]:Because of the difference of working fluid, the single stage pressure ratio of helium compressor with conventional air design method is too small. It has been proved that the cascade with large turning angle suitable for helium gas can double the stage load. The helium compressor adopts a new design method of elementary stage, which can increase the pressure ratio and reduce the number of series. In this paper, a numerical simulation study of 324 new types of planar cascades composed of five parameter combinations is carried out by using NUMECA's Fine/turbo software package. The correlation of the result data is studied, and the optimal scheme for each parameter to reflect the regularity of loss is obtained. On the basis of this, the performance of 162 new types of elementary classes with five parameter combinations are calculated. The results show that the rule of diffuser factor reflecting cascade losses under conventional design is no longer applicable under high load cascade conditions, and under the same loss coefficient conditions, The existence of a critical inlet angle makes the air flow turning angle reach the maximum, and the critical inlet angle is almost only related to the consistency, and the change of the maximum thickness ratio of the blade shape has a considerable effect on the loss when the consistency is large, and the application of the thin blade type is very favorable. The new elementary class load has been greatly improved, and the stage efficiency can be maintained at a higher level. Based on the numerical calculation data of plane cascade and elementary level, the high load three dimensional stage and the conventional three dimensional stage are designed and compared. The simulation results show that the three dimensional stage scheme under the new design is feasible. A high load 3D design scheme: Mach number of middle diameter 0.465, energy head coefficient 1.0, flow coefficient 1.141, reaction degree 0.5, consistency 1.475, design point pressure ratio 1.1388, grade efficiency 89.8690%, stage pressure ratio and stage efficiency 1.137 and 1.137. The grade-pressure ratio and stage efficiency of the design flow point are 1.139 and 88.99 respectively. The conventional design schemes are: Mach number 0.281, energy head coefficient 0.419, flow coefficient 0.5998, reactiveness 0.5, consistency 1.475. the pressure ratio of design point is 1.067, and the efficiency is 87.78%.
【學(xué)位授予單位】：中國(guó)艦船研究院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類(lèi)號(hào)】：TH45

【引證文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

1 劉震;高負(fù)荷氦氣壓氣機(jī)葉柵及多級(jí)性能研究[D];中國(guó)艦船研究院;2013年

，

本文編號(hào)：1530192