中国铁道科学Pub Date : 2024-06-01DOI: 10.1360/sspma-2024-0188
Yang Li, Kai Leong Chong, Bo-Fu Wang
{"title":"不同形状液滴撞击固壁的动力学特性研究","authors":"Yang Li, Kai Leong Chong, Bo-Fu Wang","doi":"10.1360/sspma-2024-0188","DOIUrl":"https://doi.org/10.1360/sspma-2024-0188","url":null,"abstract":"The phenomenon of droplet impact on surfaces is widely observed and closely related to everyday life and various industrial applications. This study numerically investigates the dynamic characteristics of different shaped droplets impacting hydrophilic and superhydrophobic surfaces. The research shows that when droplets impact hydrophilic surfaces, they undergo a spreading process after impact under different initial shape conditions. The different initial shapes result in variations in the neck jet formation at the edges of the droplets on the surface, but the latter stages of the spreading process are independent of the initial shape. When droplets impact superhydrophobic surfaces, they experience a sequence of spreading, retracting, and rebounding phases, regardless of the initial shape and Weber number (We). The evolution of the impact force on the surface exhibits two distinct peaks, caused by the inertial impact of the droplet and the Worthington jet formed during the retraction phase, respectively. For different Weber numbers (We), droplets of the same shape show consistent impact force evolution patterns. At the same Weber number (We), flatter droplets exhibit higher peak inertial impact forces and reach these peak values more quickly.","PeriodicalId":35767,"journal":{"name":"中国铁道科学","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciengine.com/doi/pdf/46DDEC9203B048A9A869747F50775176","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147886021","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
中国铁道科学Pub Date : 2012-01-01DOI: 10.3969/J.ISSN.1001-4632.2012.01.14
Ren Xue-chong, Li Shengjun, Gao Kewei, Su Yanjing, Jiang Bo, Chen Gang, Z. Hai
{"title":"The Relationship between Fracture Toughness and Impact Toughness of High-Speed Wheel Steel at Room Temperature","authors":"Ren Xue-chong, Li Shengjun, Gao Kewei, Su Yanjing, Jiang Bo, Chen Gang, Z. Hai","doi":"10.3969/J.ISSN.1001-4632.2012.01.14","DOIUrl":"https://doi.org/10.3969/J.ISSN.1001-4632.2012.01.14","url":null,"abstract":"The fracture toughness of high-speed wheel steel was measured at room temperature through compact tension(CT) specimens heat-treated with different procedures.Charpy V-notched impact specimens were made from the CT specimens with different fracture toughness,respectively.Impact tests were carried out on impact specimens at room temperature.The fracture toughness as well as the fracture surface and microstructure of impact specimens were observed and analyzed.Results show that the fracture toughness increases linearly with the increasing of impact toughness.The fracture modes of both CT specimens and impact specimens are mainly cleavage fractures.The inclusions in wheel steel mainly are Ti(C,N) which have little effect on the fracture toughness and impact toughness at room temperature.","PeriodicalId":35767,"journal":{"name":"中国铁道科学","volume":"33 1","pages":"93-97"},"PeriodicalIF":0.0,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70068453","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
中国铁道科学Pub Date : 2007-07-09DOI: 10.1061/40932(246)401
Jun-qing Ye, Zhi-ya Chen, Xia-miao Li
{"title":"Research on the Matching and Coordinating Relationship of Operation System in Marshalling Station on Trunk Line with Increased Speed","authors":"Jun-qing Ye, Zhi-ya Chen, Xia-miao Li","doi":"10.1061/40932(246)401","DOIUrl":"https://doi.org/10.1061/40932(246)401","url":null,"abstract":"The primary characteristic of the operation system is the unbalanced status of arrival train flows in marshalling station on trunk lines with increased speed. Based on its operational requirements and characteristics, the theory of queuing and stochastic process is used to analyze quantitatively the condition of the operation system. The paper analyzes quantitatively the critical intensity arrival time of trains and the condition for appearance of saturation of declassification subsystem, efficiency and reliability of assembling subsystem and the critical intensity departing time of departure subsystem separately. The measures for improving the matching and coordinating relationship of operation system include setting inspector crews in declassification and departure subsystem in reason, the transit rate of section under 90% during trains arriving and departing intensively, reducing the coefficient of variance of arriving and departing time interval of the linking sections, adding de assembling locomotives and assembling locomotives during busy period, adding classification tracks and departure tracks, optimizing daily operation plan, optimizing operation scheme of train flows, keeping the operation system continuous and stable, increasing the percentage of wagons in transit without sorting, and so on.","PeriodicalId":35767,"journal":{"name":"中国铁道科学","volume":"1 1","pages":"2447-2452"},"PeriodicalIF":0.0,"publicationDate":"2007-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1061/40932(246)401","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58572920","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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