Journal of Marine Engineering and Technology最新文献

{"title":"Design and evaluation of novel static mixers for SCR application","authors":"Youhong Xiao, Hui Zhao, Xinna Tian, Tao Sun","doi":"10.1080/20464177.2023.2275352","DOIUrl":"https://doi.org/10.1080/20464177.2023.2275352","url":null,"abstract":"AbstractStatic mixers are widely used in selective catalytic reduction (SCR) systems to improve the conversion efficiency and service life of the catalyst by better mixing ammonia and the exhaust stream. However, the structure of the mixer needs to be designed carefully to minimise the loss of the system pressure caused by its installation. In this work, experiments and simulations are conducted to evaluate the mixing performance of the static mixers and the system pressure loss. The simulations and experimental results have good agreement. Four novel static mixers are designed and compared with a commercial static mixer to demonstrate their performance. The results show that the box mixer can accomplish less pressure loss (690 Pa) and more homogenous mixing (CoV = 5.4%), and it can thus be used to improve the mixing of ammonia and the exhaust stream in SCR systems.KEYWORDS: Static mixerSCRmixingevaluationCFD Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work was supported by National Key Research and Development Program of China: [Grant Number 2022YFE0124300; 2022YFB3504104].Notes on contributorsYouhong XiaoYouhong Xiao, born in 1978, Ph.D. in Naval Architecture and Marine Engineering from University of Strathclyde in 2009. He has been a Professor in Department of Power and Energy Engineering, Harbin Engineering University since 2018. His research interests include the vibration noise control of power units, noise source identification technology, diesel engine emission purification, and muffling integrated control technology.Hui ZhaoHui Zhao is a Ph.D. candidate in the college of Power and Energy Engineering, Harbin Engineering University. He received the bachelor degree in marine engineering from the School of NAOCE, Shanghai Jiao Tong University, Shanghai, China, in 2015 . His current research interests include exhaust emission control of marine diesel engine.Xinna TianXinna Tian, born in 1987, Ph.D. in Naval Architecture, Ocean and Marine Engineering from University of Strathclyde in 2016. She has been a Senior Engineer in China Shipbuilding Power Engineering Co., Ltd., Shanghai, since 2018. Her research interests include marine diesel NOx reduction, marine ship Carbon dioxide capture.Tao SunTao Sun, born in 1978, Ph.D. in Marine Engineering from Harbin Engineering University in July 2005. His Research Interests including simulation and test of aerodynamic performance of compressor, heat transfer and cooling technology of turbomachinery, performance of the intake and exhaust system of the power unit, aerothermodynamics of turbomachinery and multiphysics coupling simulation of fluid machinery.","PeriodicalId":48731,"journal":{"name":"Journal of Marine Engineering and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135371681","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical investigation on hydrodynamic performance of shaftless rim-driven thruster","authors":"Liang Peng, Changfa Wang, Yongqiang Tan, Yi Hu, Zhenlei Chen, Shaohua Xia, Fan Shi","doi":"10.1080/20464177.2023.2266886","DOIUrl":"https://doi.org/10.1080/20464177.2023.2266886","url":null,"abstract":"AbstractAs a new type of propulsion method, the shaftless rim-driven thruster (RDT) has become a research hotspot for ship propulsion due to the absence of the propeller propulsion shaft system setting and the advantages of small cabin occupancy, low noise and low vibration. Numerical investigations were performed to study the effect of blade inclination angle on the hydrodynamic performance of shaftless Rim-driven Thruster. To verify the feasibility of the simulation method, the No.19A + Ka4-70 duct propeller was analysed first and the geometric model of the RDT for the hydrodynamic properties was established in reverse engineering. The hydrodynamic performance of the shaftless rim thruster was studied based on the RANS method, and the performance data of this shaftless rim thruster at each inlet speed coefficient were obtained. Additionally, the characteristics of the change in the inclination angle of the blade relative to its centre axis were examined and the effect of the change in inclination angle on the hydrodynamic performance of the shaftless rim thruster was investigated. Additionally, the numerical calculation results show that a five degree increase in the Z-axis circumferential inclination results in the increase of all the hydrodynamic coefficients of the RDT. Among them, the total thrust is increased by about 14%, the total torque is increased by about 15% and the total efficiency is also comparable to the original thruster efficiency. AcknowledgementWe would like to thank the Zhejiang Province Public Welfare Technology Application Research Project (LGG22E080020), Healthy & Intelligent Kitchen Engineering Research Center of Zhejiang Province (ZFGGJ2021-389), 2025 Major Programs on Science Technology Innovation of Ningbo (2020Z06) and National “111” Centre on Safety and Intelligent Operation of Sea Bridges (D21013) for their support for this research.Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work was supported by the Zhejiang Province Public Welfare Technology Application Research Project [grant number LGG22E080020]; 2025 Major Programs on Science Technology Innovation of Ningbo [grant number 2020Z06]; Healthy & Intelligent Kitchen Engineering Research Center of Zhejiang Province.Notes on contributorsLiang PengLiang Peng, Doctoral students, Faculty of Maritime and Transportation, Ningbo University.Changfa WangChangfa Wang, Master's student, Faculty of Maritime and Transportation, Ningbo University.Yongqiang TanYongqiang Tan, Master's student, Faculty of Maritime and Transportation, Ningbo University.Yi HuYi Hu, Master's student, Faculty of Maritime and Transportation, Ningbo University.Zhenlei ChenZhenlei Chen, Professor, Faculty of Maritime and Transportation, Ningbo University.Shaohua XiaShaohua Xia, Senior engineer, Ningbo Haibo Group Co. Ltd.Fan ShiFan Shi, Professor, Faculty of Maritime and Transportation, Ningbo University.","PeriodicalId":48731,"journal":{"name":"Journal of Marine Engineering and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136212313","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The impact of R&D investment on the new orders received by the shipbuilding enterprises under the background of innovation-driven development","authors":"Yanhui Chen, Mengmeng Ma, Jackson Jinhong Mi","doi":"10.1080/20464177.2023.2266885","DOIUrl":"https://doi.org/10.1080/20464177.2023.2266885","url":null,"abstract":"ABSTRACTUsing the panel data of listed shipbuilding enterprises from 2010 to 2021 all over the world, this paper empirically studies the impact of Research & Development investment on new orders received by shipbuilding enterprises using the panel fixed effect model and the threshold regression model. The results show that R&D investment has a positive impact on the new order of high-tech and high-value-added ships in shipbuilding enterprises. R&D investment has a time lag effect on the new orders and a non-linear relationship with the newly received orders. The 1-year lagged R&D investment has a single threshold effect on the newly received orders of liquid tankers. When the R&D investment intensity exceeds the threshold, the positive impact on the newly received orders is weakened. To be specific, when the excessive R&D investment intensity does not match the scientific research capacity of shipbuilding enterprises, enterprise resources will be mismatched. Therefore, shipbuilding enterprises should increase their investment in R&D if they want to build more high-tech and high-value-added ships. At the same time, enterprises should also pay attention not to blindly strengthen the R&D investment, but to keep it within a reasonable range, so that resources can be allocated appropriately. Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis research was supported by National Natural Science Foundation of China [grant number 42176217], [grant number 71701127]Notes on contributorsYanhui ChenDr. Yanhui Chen obtained her Ph.D. in the Department of Management Sciences from the City University of Hong Kong. She is an associate professor in the School of Economics and Management at Shanghai Maritime University. Her research interests include financial time series analysis and shipping economics.Mengmeng MaMengmeng Ma is a postgraduate student in the School of Economics and Management at Shanghai Maritime University, majoring in shipping finance. Her research interest is shipping economics.Jackson Jinhong MiProf. Jackson Jinhong Mi is a Professor of Maritime Finance and doctoral supervisor in School of Economics and Management at the Shanghai Maritime University. He holds a Ph.D. in Economics and Postdoc in Data Science from Fudan University. His teaching and research interests include the combination of Finance and Maritime Economics as well as structural equation modelling and machine learning.","PeriodicalId":48731,"journal":{"name":"Journal of Marine Engineering and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136063650","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The effect of tip clearance on the rotor-stator interaction and noise of marine 1.5-stage compressor","authors":"Huabing Lu, Youhong Xiao, Zhigang Liu, Ye Yuan, Peilin Zhou","doi":"10.1080/20464177.2023.2255337","DOIUrl":"https://doi.org/10.1080/20464177.2023.2255337","url":null,"abstract":"Tip-clearance (TC) noise is significant in compressors and has garnered scholarly attention for the isolated rotor. However, applying these findings to marine compressors with rotor-stator-interaction (RSI) is challenging. In this paper, a comprehensive analysis was given of a marine 1.5-stage compressor. The investigation included five different TC configurations (0, 0.25, 0.5, 0.75, and 1 mm) and the RSI was a focal point of the study. The accuracy of numerical calculations of the flow field was verified using experimental data. The results reveal a new phenomenon; the radial separation flow of the rotor’s trailing edge is mixed with the TC flow and a wake above the 90 span of the blade is formed. An understanding of this mixing mechanism is crucial for model that describes the effect of TC on the RSI. The single-tone sound source of the stator’s leading-edge tip area is the smallest when the TC is 0.25 mm. In contrast, the single-tone sound source is largest when the TC is equal to zero. Investigation of different TCs in three acoustic environments shows no obvious disparity in the single-tone acoustic power response of various TCs. There is, however, a correlation between the flow mixing mechanism and the noise.","PeriodicalId":48731,"journal":{"name":"Journal of Marine Engineering and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135742024","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Wind influence and bathymetric effects in wave overtopping based on a long-term field campaign in the Outer Port of Punta Langosteira (Spain)","authors":"Raquel Costas, Andrés Figuero, José Sande, Enrique Peña, Alberto Alvarellos, Andrés Guerra","doi":"10.1080/20464177.2023.2255330","DOIUrl":"https://doi.org/10.1080/20464177.2023.2255330","url":null,"abstract":"","PeriodicalId":48731,"journal":{"name":"Journal of Marine Engineering and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136191896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}