基于大渦模擬方法研究大跨度曲面屋蓋非定常氣動(dòng)力的特性（英文）
發(fā)布時(shí)間：2019-07-05 09:59
【摘要】：目的:探討作用于大跨度曲面屋蓋非定常氣動(dòng)力的特性,為考慮非定常氣動(dòng)力影響的大跨度曲面屋蓋抗風(fēng)設(shè)計(jì)提供理論參考。創(chuàng)新點(diǎn):1.采用強(qiáng)迫振動(dòng)試驗(yàn);2.采用大渦模擬(LES)流入脈動(dòng)風(fēng)的生成方法;3.研究大跨度曲面屋蓋非定常氣動(dòng)力特性。方法:1.通過(guò)強(qiáng)迫振動(dòng)風(fēng)洞試驗(yàn)方法探討風(fēng)速、強(qiáng)迫振動(dòng)振幅、屋蓋的矢跨比和縮減頻率對(duì)非定常氣動(dòng)力的影響;2.采用計(jì)算流體力學(xué)數(shù)值模擬重現(xiàn)風(fēng)洞試驗(yàn),從而在更寬的縮減頻率范圍內(nèi)分析非定常氣動(dòng)力的特性,并且通過(guò)可視化流場(chǎng)的分析探討風(fēng)與屋蓋相互作用的機(jī)理。結(jié)論:1.屋蓋的振動(dòng)對(duì)屋蓋表面的風(fēng)壓分布影響較大。2.屋蓋的振動(dòng)可能抑制屋蓋背風(fēng)面漩渦的脫落。3.根據(jù)風(fēng)洞試驗(yàn)和數(shù)值模擬的結(jié)果分析得到的矢跨比、風(fēng)速和振動(dòng)振幅對(duì)氣動(dòng)阻尼系數(shù)和氣動(dòng)剛度系數(shù)的影響較小;氣動(dòng)阻尼系數(shù)和氣動(dòng)剛度系數(shù)主要隨著縮減頻率的變化而變化。4.氣動(dòng)剛度系數(shù)為正值,使得結(jié)構(gòu)的總剛度減小,從而減小結(jié)構(gòu)的固有頻率;氣動(dòng)阻尼系數(shù)為負(fù)值,使得結(jié)構(gòu)總阻尼增加。5.風(fēng)洞試驗(yàn)和LES模擬結(jié)果的一致性可以說(shuō)明,LES是一個(gè)能夠有效研究非定常氣動(dòng)力特性的數(shù)值模擬方法。
[Abstract]:Aim: to investigate the characteristics of non-steady aerodynamics of long-span curved roof, and to provide theoretical reference for wind resistance design of long-span curved roof considering the influence of unstable aerodynamics. Innovation: 1. Forced vibration test was used; 2. The generation method of large vortex simulation of (LES) inflow pulsating wind is adopted. The non-steady hydrodynamic characteristics of long-span curved roof are studied. Method: 1. The effects of wind speed, forced vibration amplitude, rise-span ratio and reduced frequency of roof on unstable aerodynamics are discussed by forced vibration wind tunnel test method. The numerical simulation of computational fluid dynamics is used to reproduce the wind tunnel test, so as to analyze the characteristics of unstable aerodynamics in a wider reduced frequency range, and the mechanism of interaction between wind and roof is discussed through the analysis of visual flow field. Conclusion: 1. The vibration of the roof has a great influence on the wind pressure distribution on the surface of the roof. 2. The vibration of the roof may inhibit the shedding of the vortex on the leeward surface of the roof. 3. According to the results of wind tunnel test and numerical simulation, the rise-span ratio, wind speed and vibration amplitude have little effect on the pneumatic damping coefficient and pneumatic stiffness coefficient, and the pneumatic damping coefficient and pneumatic stiffness coefficient mainly change with the reduction frequency. 4. The total stiffness coefficient of the structure is positive, so that the total stiffness of the structure is reduced, thus the natural frequency of the structure is reduced, and the total damping coefficient of the structure is negative, which increases the total damping of the structure. 5. The consistency between wind tunnel test and LES simulation results shows that LES is an effective numerical simulation method which can effectively study the unsteady aerodynamic characteristics.
【作者單位】： School
【基金】：Project supported by the Foundation of Jiangsu Collaborative Innovation Center for Building Energy Saving Construction Technology for Young Teachers(No.SJXTQ1515),China
【分類號(hào)】：TU352.2
，
本文編號(hào)：2510445
[Abstract]:Aim: to investigate the characteristics of non-steady aerodynamics of long-span curved roof, and to provide theoretical reference for wind resistance design of long-span curved roof considering the influence of unstable aerodynamics. Innovation: 1. Forced vibration test was used; 2. The generation method of large vortex simulation of (LES) inflow pulsating wind is adopted. The non-steady hydrodynamic characteristics of long-span curved roof are studied. Method: 1. The effects of wind speed, forced vibration amplitude, rise-span ratio and reduced frequency of roof on unstable aerodynamics are discussed by forced vibration wind tunnel test method. The numerical simulation of computational fluid dynamics is used to reproduce the wind tunnel test, so as to analyze the characteristics of unstable aerodynamics in a wider reduced frequency range, and the mechanism of interaction between wind and roof is discussed through the analysis of visual flow field. Conclusion: 1. The vibration of the roof has a great influence on the wind pressure distribution on the surface of the roof. 2. The vibration of the roof may inhibit the shedding of the vortex on the leeward surface of the roof. 3. According to the results of wind tunnel test and numerical simulation, the rise-span ratio, wind speed and vibration amplitude have little effect on the pneumatic damping coefficient and pneumatic stiffness coefficient, and the pneumatic damping coefficient and pneumatic stiffness coefficient mainly change with the reduction frequency. 4. The total stiffness coefficient of the structure is positive, so that the total stiffness of the structure is reduced, thus the natural frequency of the structure is reduced, and the total damping coefficient of the structure is negative, which increases the total damping of the structure. 5. The consistency between wind tunnel test and LES simulation results shows that LES is an effective numerical simulation method which can effectively study the unsteady aerodynamic characteristics.
【作者單位】： School
【基金】：Project supported by the Foundation of Jiangsu Collaborative Innovation Center for Building Energy Saving Construction Technology for Young Teachers(No.SJXTQ1515),China
【分類號(hào)】：TU352.2
，
本文編號(hào)：2510445
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