Journal of the Global Power and Propulsion Society最新文献

{"title":"Enabling the Potential of Hybrid Electric Propulsion Through Lean-Burn-Combustion Turbofans","authors":"Stavros Vouros, Mavroudis D. Kavvalos, Smruti Sahoo, K. Kyprianidis","doi":"10.33737/gpps20-tc-86","DOIUrl":"https://doi.org/10.33737/gpps20-tc-86","url":null,"abstract":"Hybrid-electric propulsion has emerged as a promising technology to mitigate the adverse environmental impact of civil aviation. Boosting conventional gas turbines with electric power improves mission performance and operability. In this work the impact of electrification on pollutant emissions and direct operating cost of geared turbofan configurations is evaluated for an 150-passenger aircraft. A baseline two-and-a-half-shaft geared turbofan, representative of year 2035 entry-into-service technology, is employed. Parallel hybridization is implemented through coupling a battery-powered electric motor to the engine low-speed shaft. A multi-disciplinary design space exploration framework is employed comprising modelling methods for multi-point engine design, aircraft sizing, performance and pollutant emissions, mission and economic analysis. A probabilistic approach is developed considering uncertainties in the evaluation of direct operating cost. Sensitivities to electrical power system technology levels, as well as fuel price and emissions taxation are quantified at different time-frames. The benefits of lean direct injection are explored along short-, medium-, and long-range missions, demonstrating 32% NOx savings compared to traditional rich-burn, quick-mix, lean-burn technologies in short-range operations. The impact of electrification on the enhancement of lean direct injection benefits is investigated. For hybrid-electric powerplants, the take-off-to-cruise turbine entry temperature ratio is 2.5% lower than the baseline, extending the corresponding NOx reductions to the level of 46% in short-range missions. This work sheds light on the environmental and economic potential and limitations of a hybrid-electric propulsion concept towards a greener and sustainable civil aviation.","PeriodicalId":53002,"journal":{"name":"Journal of the Global Power and Propulsion Society","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2020-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45208940","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}

{"title":"Unsteady Phenomena at the Combustor-Turbine Interface","authors":"Faisal Shaikh, B. Rosic","doi":"10.33737/gpps20-tc-150","DOIUrl":"https://doi.org/10.33737/gpps20-tc-150","url":null,"abstract":"The combustor-turbine interface in a gas turbine is characterised by complex, highly unsteady flows. In a combined experimental and large eddy simulation (LES) study including realistic combustor geometry, the standard model of secondary flows in the nozzle guide vanes (NGV) is found to be oversimplified. A swirl core is created in the combustion chamber which convects into the first vane passages. Four main consequences of this are identified: variation in vane loading; unsteady heat transfer on vane surfaces; unsteadiness at the leading edge horseshoe vortex, and variation in the position of the passage vortex. These phenomena occur at relatively low frequencies, from 50–300 Hz. It seems likely that these unsteady phenomena result in non-optimal film cooling, and that by reducing unsteadiness designs with greater cooling efficiency could be achieved.\u0000\u0000Measurements were performed in a high speed test facility modelling a large industrial gas turbine with can combustors, including nozzle guide vanes and combustion chambers. Vane surfaces and endwalls of a nozzle guide vane were instrumented with 384 high speed thin film heat flux gauges, to measure unsteady heat transfer. The high resolution of measurements was such to allow direct visualisation in time of large scale turbulent structures over the endwalls and vane surfaces.\u0000\u0000A matching LES simulation was carried out in a domain matching experimental conditions including upstream swirl generators and transition duct. Data reduction allowed time-varying LES data to be recorded for several cycles of the unsteady phenomena observed. The combination of LES and experimental data allows physical explanation and visualisation of flow events.","PeriodicalId":53002,"journal":{"name":"Journal of the Global Power and Propulsion Society","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2020-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44319742","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}

{"title":"Investigation of the tip injection for stall control in a transonic compressor with inlet distortion","authors":"Wenqiang Zhang, M. Vahdati","doi":"10.33737/gpps20-tc-22","DOIUrl":"https://doi.org/10.33737/gpps20-tc-22","url":null,"abstract":"Experimental studies have shown that tip injection upstream of the rotor can extend its operational range when subjected to circumferential inlet distortion. Typically, injectors are placed uniformly around the annulus. However, such arrangement consumes a large amount of high-pressure air and decreases the overall efficiency of the compression system. The aim of this paper is to minimise the amount of the injected air by determining the most effective circumferential location for the injector.\u0000In this study, NASA stage 35 was used as the test case. The experiment was conducted with a circumferential total pressure distortion of 120 degrees. In the first part of this paper, numerical simulations were compared against the experimental data and good match was obtained. In the second part, tip injection at three different positions were tested: the clean flow region (Position 1), the distorted region (Position 2) and the border between the clean and distorted regions (Position 3). It was found that a mild injection (0.66% of the main flow) at Position 2 and Position 3 can extend the stall margin by 1.8% and 2.7%, respectively. No obvious improvement was observed for the injection at Position 1. With a larger injection of 1.5% of main flow at Position 3, the stall margin improved further with no efficiency loss.","PeriodicalId":53002,"journal":{"name":"Journal of the Global Power and Propulsion Society","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2020-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46251189","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}

{"title":"CONSIDERATION OF SEMANTIC TRANSFORMATIONS OF THE TERM \"LEADER\" IN HISTORICAL DOCUMENTS USING LINGUISTIC ANTHROPOLOGY","authors":"Ruslana Marockina","doi":"10.32743/2658-4077.2020.7.16.340","DOIUrl":"https://doi.org/10.32743/2658-4077.2020.7.16.340","url":null,"abstract":"The article considers the semantic transformation of the term “leader” over the course of five decades of the twentieth century. The article touches on the interdisciplinary field of linguistic anthropology and history. The term \"leader\" was undoubtedly one of the most relevant terms in the USSR, which allows the use of rich source material to study it. The ability of people to follow the change in political sentiments in the country reflected in the vocabulary of the language, preserved in historical documents. The author of the article gives several interpretations of the meaning of the term “leader”, indicated in the domestic explanatory dictionaries, and, citing examples from history, explains the reasons for the semantic transformation of this term in the periods from 1917 to the 60s. ХХ century. Ключевые слова: лингвистическая антропология, общественно-политический термин, смысловая трансформация термина «вождь», В. Ленин, И. Сталин, Н. Хрущёв.","PeriodicalId":53002,"journal":{"name":"Journal of the Global Power and Propulsion Society","volume":"1 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2020-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79293250","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}

{"title":"THE MAIN REASONS FOR THE FORMATION AND INITIAL ATTEMPTS TO DEPLOY THE CAMP COURT SYSTEM IN 1944","authors":"A. Dimitrieva","doi":"10.32743/2658-4077.2020.7.16.338","DOIUrl":"https://doi.org/10.32743/2658-4077.2020.7.16.338","url":null,"abstract":"This article examines the main prerequisites for creating a system of camp courts and the reasons for their appearance. The article analyzes the judicial system in the camps before the creation of the official Department of camp courts in the context of the political struggle in the people's Commissariat of justice of the USSR in 1944. Ключевые слова: лагерная юстиция, судебная система, сталинизм, лагеря, лагерные суды.","PeriodicalId":53002,"journal":{"name":"Journal of the Global Power and Propulsion Society","volume":"12 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2020-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77799505","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}

{"title":"IMAGING DIAGNOSTICS OF COMBUSTION INSTABILITY IN PREMIXED SWIRLING COMBUSTION","authors":"Yao Yang, Gaofeng Wang, Yuanqi Fang, Yifan Xia, Liang Zhong","doi":"10.33737/jgpps/120536","DOIUrl":"https://doi.org/10.33737/jgpps/120536","url":null,"abstract":"An experimental study on combustion instability is presented with focus on propane-air premixed swirling flames. Swirling flames under self-excited oscillation are studied by imaging of visible light and OH* chemiluminescence filter under several typical conditions. The dynamical characteristics of swirling flames were analysed by Dynamic Mode Decomposition (DMD) method. Three types of unstable modes in the combustor system were observed, which correspond to typical acoustic resonant modes (LF mode, C1/4 mode and P1/2 mode) of the combustor system. The combustion instability is in the longitudinal mode. Furthermore, the structure of downstream hot burnt gas under stable combustion and unstable combustion is studied by imaging of visible light and near-infrared light. Results show that there is a significant difference in the downstream flow under stable combustion and unstable combustion. The DMD spectrum of the flame and the downstream hot burnt gas obtained is the same, which is close to the characteristic frequency of acoustic pressure captured by the microphone signal. The visible light and near-infrared light imaging observation method adopted in this paper provides a new imaging method for the investigation of thermo-acoustic instability.","PeriodicalId":53002,"journal":{"name":"Journal of the Global Power and Propulsion Society","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2020-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45000217","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}

{"title":"HYBRID ELECTRIC POWERTRAIN FOR LONG-HAUL TRUCKS AND BUSES: PRELIMINARY ANALYSIS OF A NEW CONCEPT BASED ON A COMBINED CYCLE POWER PLANT","authors":"Sebastian Bahamonde Noriega, C. Servi, P. Colonna","doi":"10.33737/jgpps/118979","DOIUrl":"https://doi.org/10.33737/jgpps/118979","url":null,"abstract":"The electric hybridization of heavy-duty road vehicles is\u0000a promising alternative to reduce the environmental impact\u0000of freight and passengers transportation. Employing a micro\u0000gas turbine as a prime mover offers several advantages: high\u0000power density, fuel flexibility, ultra-low emissions, low vibrations and noise, simplicity and lower maintenance cost. State-of-the-art micro gas turbines feature an efficiency of 30%, which can be increased to 40% by employing a mini organic Rankine cycle system as a bottoming power plant. Such a powertrain could achieve higher efficiency\u0000with next-gen micro gas turbines and mini ORC systems, especially with an R&D push of the automotive sector. \u0000This paper presents the analysis of a hybrid electric heavy-duty vehicle with a prime mover based on this concept.\u0000The best combined cycle system stemming from the design exercise features an estimated peak efficiency of 44%, and a nominal power output of about 150kW. This corresponds to the power demand at cruise condition of a long-haul truck. A series configuration with Lithium-Ion batteries was selected for the hybrid powertrain, for it decouples the prime mover dynamics from the power demand. The benchmark is a vehicle featuring a next generation diesel engine, with a peak efficiency equal to 50%.\u0000The results show that the fuel economy can be largely\u0000improved by increasing the size of the battery in the hybrid\u0000powertrain. Furthermore, employing natural gas in the prime\u0000mover of the hybrid vehicle leads to ultra low emissions that\u0000are well below the limits set by European and north American\u0000regulations.\u0000Additionally, the CO2 emissions of the hybrid powertrain are\u0000considerably lower than that of the benchmark. The work documented here thus demonstrates the potential of this hybrid powertrain concept, especially in terms of exhaust emissions,\u0000as a promising transition technology towards the full electrification of the powertrain.","PeriodicalId":53002,"journal":{"name":"Journal of the Global Power and Propulsion Society","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2020-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44642732","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}

{"title":"HISTORICAL AND LEGAL SITUATION OF THE CREATION OF THE LEGISLATIVE CODE OF THE VIII CENTURY. ECLOGUE OF LAWS","authors":"S. Loza","doi":"10.32743/2658-4077.2020.3.12.255","DOIUrl":"https://doi.org/10.32743/2658-4077.2020.3.12.255","url":null,"abstract":"The aim of the article is to establish reasons and circumstances of the occurrence of Byzantine eclogue. Such ques-tions like background research and formation features of the Byzantine legislative code (eclogue of laws) are raised for goal achievement. The historical situation of the origin of the new Byzantine code and the place which was allocated to the legislation of the iconoclasts are presented. Ключевые иконоборцы, эклога законов, Византия,","PeriodicalId":53002,"journal":{"name":"Journal of the Global Power and Propulsion Society","volume":"57 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2020-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73471201","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}

{"title":"SOCIALIST NATION-BUILDING: EXPORT OF THE WORLD REVOLUTION TO THE EAST","authors":"M. Baldano, P. Varnavsky, S. Kirichenko","doi":"10.32743/2658-4077.2019.9.9.191","DOIUrl":"https://doi.org/10.32743/2658-4077.2019.9.9.191","url":null,"abstract":"The article investigates the role of the Buryat Bolsheviks in the process of creating the Buryat-Mongolian autonomy of the RSFSR. The emphasis is made on the fact that they considered the national autonomy not so much as an institution contributing to the development and preservation of the ethnic specificity of the Buryats, but rather as a tool that No 9 (9), декабрь, 2019 г. could be used to involve the Buryat people (and even more broadly the Mongolian-speaking peoples of the foreign East) in the planned world revolution. The article concludes that the Communists have taken a special place in the Buryat ethno-national movement – by participating in the nationalist discourse, they actually sought to subordinate it to the idea of a world socialist revolution. Ключевые слова: буряты, этничность, нациестроительство, национальное движение, бурятские коммунисты, автономия.","PeriodicalId":53002,"journal":{"name":"Journal of the Global Power and Propulsion Society","volume":"99 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2019-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86968817","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}

{"title":"HOMO BEATUS AS A METAMODERN PERSON","authors":"Pavel Piskareov","doi":"10.32743/2658-4077.2019.8.8.174","DOIUrl":"https://doi.org/10.32743/2658-4077.2019.8.8.174","url":null,"abstract":"The authors of the article believe that postmodernism has come and gone, giving way to metamodern, a new “era of the future”. Metamodern is the era of the “happy man”, homo beatus. This is a period of self-actualization of a person, life in a self-constructed world. А metamodern person creates her own poles of social attraction. The task of the new person is to build a personal “value-semantic universe” and the development of their own social norms. The man of metamodern receives a new level of freedom, this is the so-called “positive freedom”. Homo beatus independently builds its identities, draws a kind of “identity map”, cultural, national, as well as a map of its movements. Homo beatus does not depend on external circumstances, historical, social, cultural conditions, it is a product of its own creation, choices, attitudes to life. Ключевые слова: постмодерн, метамодерн, постмодернизм, метамодернизм, самоактуализация, позитивная свобода, homo beatus.","PeriodicalId":53002,"journal":{"name":"Journal of the Global Power and Propulsion Society","volume":"18 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2019-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84594821","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}