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Experimental study on shock interaction control of double wedge in high-enthalpy hypersonic flow subject to plasma synthetic jet

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chinese Journal of Aeronautics 2024年第4期37卷 151-165页

作者： Xuzhen XIE Qiang liu Yan ZHoU Zhenbing LUo Wei XIE guanghui BAI Kai LUo Qiu WANG jianjun WU College of Aerospace Science and engineering National University of Defense TechnologyChangsha 410073China china academy of Launch Vehicle Technology Beijing 100076China Institute of Mechanics Chinese Academy of SciencesBeijing 100190China

The hypersonic shock-shock interaction flow field at double-wedge geometries controlled by plasma synthetic jet actuator is experimentally studied in a Ma = 8 high-enthalpy shock tunnel with the purpose of exp.o.ing a novel technique for reducing surface heat flux in a real flight environment. The results demonstrate that increasing the discharge energy is advantageous in eliminating the shock wave, shifting the shock wave interaction point, and shortening the control response time. The oblique shock wave can be completely removed when the actuator's discharge energy grows from 0.4 J to 11.5 J, and the displacement of the shock wave interaction point increases by 124.56%, while the controlled response time is shortened by 30 μs. Besides, the reduction in diameter of the jet exit is firstly p.o.ed to have a negative impact on energy deposition in a working environment with incoming flow, which reduces the discharge energy and hence decreases the control effect. The shock wave control response time lengthens when the jet exits away from the second wedge. Along with comparing the change in wall heat flux at the second wedge over time, the control effect of plasma synthetic jet actuator with and without inflation is also analyzed. When plasma synthetic jet works in inflatable mode, both the ability to eliminate shock waves and the shifting effect of the shock wave interaction point are increased significantly, and the wall heat flux is also reduced.

关键词： Hypersonic flow High-enthalpy flow plasma synthetic jet Shock wave Flow control

半地下箱体式MBR生化组合工艺工程设计案例分析

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净水技术 2021年第11期40卷 139-146,163页

作者：柳岩高海英刘建军李坤石洁北京碧水源科技股份有限公司北京102206 北京久安建设投资集团有限公司北京102206

近年来,陕西省对污水处理厂出水水质、厂区景观的要求不断提高,同时对用地面积不断紧缩。项目响应上述政策需求,适当考虑经济因素,采用半地下箱体式污水处理厂结构形式,并配合AAo+MBR生化组合工艺作为主工艺流程。根据主工艺特点,在好... 详细信息

近年来,陕西省对污水处理厂出水水质、厂区景观的要求不断提高,同时对用地面积不断紧缩。项目响应上述政策需求,适当考虑经济因素,采用半地下箱体式污水处理厂结构形式,并配合AAo+MBR生化组合工艺作为主工艺流程。根据主工艺特点,在好氧池末端投加pAC同步排泥除磷,消毒采用紫外辅助补氯。对进水水质分析可知,原水可生化性较好,并结合出水水质确定生化池停留时间,厌氧池为1.5 h,缺氧池为4 h,好氧池为6 h。膜池污泥浓度设计值为10000 mg/L,膜池至好氧池前端回流比为500%,好氧池末端至缺氧池前端回流比为300%,缺氧池末端至厌氧池前端回流比为200%。考虑经济合理性,MBR膜池设计上根据膜组器尺寸及箱体柱网布置,确定膜池宽度为3400 mm,柱网中心距为7800 mm。正式运行后,各项指标均满足出水要求,SS及氨氮指标较低,符合本工艺特点。利用半地下结构形式,现场景观效果好,同时占地较少。

关键词：半地下箱体式 AAo-MBR工艺污水处理厂设计高出水标准

First result from the Jinping Underground Nuclear Astrophysics experiment JUNA:precise measurement of the 92 keV ^(25)Mg(p,γ)^(26)Al resonance

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Science Bulletin 2022年第2期67卷 125-132,M0003页

作者： Jun Su Hao Zhang Zhihong Li p.o.o Ventura Yunju Li Ertao Li Chen Chen Yangping Shen Gang Lian Bing Guo Xinyue Li Liyong Zhang jianjun He Yaode Sheng Yinji Chen Luohuan Wang Long Zhang Fuqiang Cao Wei Nan Weike Nan Gexing Li Na Song Baoqun Cui Lihua Chen Ruigang Ma Zhicheng Zhang Taoyu Jiao Bingshui Gao Xiaodong Tang Qi Wu Jiaqing Li Liangting Sun Shuo Wang Shengquan Yan Junhui Liao Youbao Wang Sheng Zeng Ding Nan Qiwen Fan Ningchun Qi Wenliang Sun Xuyuan Guo peng Zhang Yunhua Chen Yong Zhou Jifang Zhou Jinrong He Changsong Shang Mingchuan Li Jianping Cheng Weiping liu JUNA Collaboration china Institute of Atomic Energy P.O.Box 275(10)Beijing 102413China Key Laboratory of Beam Technology of Ministry of Education College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 101408China INAF Osservatorio Astronomico di RomaVia Frascati 33Monte Porzio Catone(RM)00077Italy College of physics and op.o.lectronic engineering Shenzhen UniversityShenzhen 518060China Institute of Modern physics Chinese Academy of SciencesLanzhou 730000China Shandong p.o.incial Key Laboratory of optical Astronomy and Solar-Terrestrial Environment Institute of Space SciencesShandong UniversityWeihai 264209China Yalong River Hydropower Development Company Chengdu 610051China 不详

The ^(25)Mg(p,γ)^(26)Al reaction plays an important role in the study of cosmic 1.809 MeV γ-ray as a signature of ongoing nucleosynthesis in the *** astrophysical temperature around 0.1 GK,the ^(25)Mg(p,γ)^(26)Al reaction rates are dominated by the 92 keV resonance capture *** report a precise measurement of the 92 keV ^(25)Mg(p,γ)^(26)Al resonance in the day-one experiment at Jinping Underground Nuclear Astrophysics experiment(JUNA)facility in the china Jinping Underground Laboratory(CJpL).The resonance strength and ground state feeding factor are determined to be 3.8±0.3×10^(-10) eV and 0:660:04,*** results are in agreement with those reported in the previous direct underground measurement within uncertainty,but with significantly reduced ***,we recommend new ^(25)Mg(p,γ)^(26)Al reaction rates which are by a factor of 2.4 larger than those adopted in REACLIB database at the temperature around 0.1 *** new results indicate higher p.o.uction rates of ^(26g)Al and the cosmic 1.809 MeV γ-*** implication of the new rates for the understanding of other astrophysical situations is also discussed.

关键词： Nuclear astrophysics Underground laboratory Cosmic c ray Resonance reaction 26Al