本文關(guān)鍵詞： 離心透平 氣動設(shè)計 數(shù)值模擬 變工況特性　出處：《工程熱物理學(xué)報》2016年06期 　論文類型：期刊論文

【摘要】：本文以完全氣體為流動工質(zhì),進(jìn)行離心透平級的氣動設(shè)計與性能研究。采用數(shù)值模擬方法,對所設(shè)計的離心透平級進(jìn)行設(shè)計工況及變工況條件下的三維穩(wěn)態(tài)流場分析。結(jié)果表明:在設(shè)計工況下,流道內(nèi)的流場合理,流線流暢,氣動性能符合預(yù)期;在變工況條件下,當(dāng)轉(zhuǎn)速一定,隨著背壓的降低,流量緩慢增大,效率先緩慢下降,再迅速下降。隨著背壓的升高,流量和效率都是先緩慢下降,再迅速下降;渦流的出現(xiàn)會導(dǎo)致變工況點的效率的迅速下降;轉(zhuǎn)速增大對流量幾乎沒有影響,轉(zhuǎn)速增大可使最佳效率點向壓比p_2/p_1小的方向移動;轉(zhuǎn)速減少對流量也幾乎沒有影響,轉(zhuǎn)速減少可使最佳效率點向壓比p_2/p_1大的方向移動;進(jìn)口溫度的變化對級效率影響較小,質(zhì)量流量隨進(jìn)口溫度的增大而降低。
[Abstract]:In this paper, the aerodynamic design and performance of centrifugal turbine stage are studied with complete gas as flow medium. The three dimensional steady flow field of the designed centrifugal turbine stage is analyzed under the conditions of design and variable working conditions. The results show that the flow field in the flow channel is reasonable, the flow line is smooth, and the aerodynamic performance is in line with the expectation under the conditions of variable working conditions. When the speed is constant, with the decrease of back pressure, the flow rate increases slowly, the efficiency decreases slowly, and then decreases rapidly. With the increase of back pressure, the flow rate and efficiency decrease slowly first and then rapidly. The appearance of eddy current will lead to a rapid decrease in the efficiency of the off-condition point; the increase of the rotational speed has little effect on the flow rate, and the increase of the rotational speed can make the optimal point of efficiency move in the direction of smaller pressure than the p _ s _ p _ p _ p _ p _ 1, and the decrease of the speed of speed has little effect on the flow rate. The decrease of rotational speed can make the best efficiency point move in the direction of greater pressure than that of P _ 2 / p _ s _ 1, and the change of inlet temperature has little effect on the stage efficiency, and the mass flow rate decreases with the increase of inlet temperature.
【作者單位】： 上海理工大學(xué)能源與動力工程學(xué)院;上海市動力工程多相流動與傳熱重點實驗室;
【基金】：國家自然科學(xué)基金(No.51536006;No.51576133) 上海市科委基地建設(shè)項目(No.13DZ2260900) 上海理工大學(xué)流動控制與仿真重點實驗室資助(No.D15013)
【分類號】：TK05

【相似文獻(xiàn)】

相關(guān)期刊論文 前4條

1 林奇燕;金志磊;王磊;;超音速復(fù)速級渦輪的氣動設(shè)計改進(jìn)[J];火箭推進(jìn);2014年01期

2 李劍白;卿雄杰;周山;曾軍;;渦輪葉片氣動設(shè)計軟件BladeDesign[J];燃?xì)鉁u輪試驗與研究;2011年03期

3 李艷;李海波;顧春偉;;有機工質(zhì)向心透平氣動設(shè)計與變工況性能預(yù)測[J];工程熱物理學(xué)報;2013年01期

4 ;[J];;年期

相關(guān)碩士學(xué)位論文 前2條

1 邊昕;大膨脹比兩級渦輪氣動設(shè)計及數(shù)值研究[D];哈爾濱工業(yè)大學(xué);2015年

2 張卿;ORC系統(tǒng)透平膨脹機的設(shè)計與數(shù)值模擬[D];西華大學(xué);2015年

，

本文編號：1522159