考慮氣蝕的液力緩速器湍流流動尺度解析模擬(英文)
發(fā)布時間:2021-02-07 17:16
目的:液力緩速器高速運行時會產(chǎn)生氣蝕侵蝕現(xiàn)象,進而對緩速器的緩速制動及平穩(wěn)運行產(chǎn)生不利影響。本文旨在對液力緩速器的氣蝕湍流場進行分析,探究氣蝕侵蝕發(fā)生的原因,為進一步探究減輕氣蝕侵蝕的措施提供理論基礎(chǔ)。創(chuàng)新點:1.引入目前先進的尺度解析模擬方法來模擬湍流場,使湍流場數(shù)值計算結(jié)果更加真實;2.采用氣液兩相流模型和氣蝕模型相結(jié)合的方法模擬氣蝕現(xiàn)象,并通過流場中的氣泡體積來衡量氣蝕侵蝕程度。方法:1.采用不同的湍流模型解析液力緩速器四種轉(zhuǎn)速下的湍流場,并通過比較流場結(jié)果得出不同湍流模型模擬流場的區(qū)別(圖3~5和7);2.采用應(yīng)力混合渦(SBES)模型模擬高轉(zhuǎn)速下的氣蝕流場,并提取流場處理結(jié)果來分析緩速器內(nèi)部氣泡體積的瞬態(tài)演變規(guī)律(圖8和9);3.提取不同時刻的葉片溫度來分析氣蝕引起的能量變化(圖12和13)。結(jié)論:1.在四大湍流模型中,SBES模型模擬湍流場渦旋的能力最強且提取出的制動轉(zhuǎn)矩結(jié)果與實驗值最接近;2.高轉(zhuǎn)速下的氣蝕侵蝕情況嚴重,流場中出現(xiàn)的氣泡體積較大,并且,隨著時間推移氣泡體積累積對緩速器運行將產(chǎn)生不利影響。3.氣蝕流場中出現(xiàn)的氣泡會影響緩速器湍流場中的渦旋,并且影響緩速器的葉...
【文章來源】:Journal of Zhejiang University-Science A(Applied Physics & Engineering). 2020,21(10)
【文章頁數(shù)】:17 頁
【文章目錄】:
1 Introduction
2 Computational model
2.1 VOF model
2.2 Cavitation model
2.3 Turbulence model
2.3.1 SST k-ωmodel
2.3.2 IDDES model
2.3.3 SBES model
2.3.4 DLES model
3 Computational settings and verification
3.1 Mesh layout and simulation settings
3.2 Comparison between the simulation and ex-perimental data
4 Simulation results and discussion
4.1 Comparative analysis for velocity components
4.2 Comparative vortex analysis of the chord surface
5 Analysis of the cavitation flows
5.1 Transient bubble volume fraction evolution analysis on the flow surface
5.2 Analysis of the cavitation flow data of the axial surface at 0.04 s and 0.10 s
5.3 Variation in the temperature of the rotor and stator pressure blades
6 Conclusions
Contributors
Conflict of interest
【參考文獻】:
期刊論文
[1]A review of cavitation in hydraulic machinery[J]. 羅先武,季斌,Yoshinobu TSUJIMOTO. Journal of Hydrodynamics. 2016(03)
本文編號:3022553
【文章來源】:Journal of Zhejiang University-Science A(Applied Physics & Engineering). 2020,21(10)
【文章頁數(shù)】:17 頁
【文章目錄】:
1 Introduction
2 Computational model
2.1 VOF model
2.2 Cavitation model
2.3 Turbulence model
2.3.1 SST k-ωmodel
2.3.2 IDDES model
2.3.3 SBES model
2.3.4 DLES model
3 Computational settings and verification
3.1 Mesh layout and simulation settings
3.2 Comparison between the simulation and ex-perimental data
4 Simulation results and discussion
4.1 Comparative analysis for velocity components
4.2 Comparative vortex analysis of the chord surface
5 Analysis of the cavitation flows
5.1 Transient bubble volume fraction evolution analysis on the flow surface
5.2 Analysis of the cavitation flow data of the axial surface at 0.04 s and 0.10 s
5.3 Variation in the temperature of the rotor and stator pressure blades
6 Conclusions
Contributors
Conflict of interest
【參考文獻】:
期刊論文
[1]A review of cavitation in hydraulic machinery[J]. 羅先武,季斌,Yoshinobu TSUJIMOTO. Journal of Hydrodynamics. 2016(03)
本文編號:3022553
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