Journal of Propulsion and Power最新文献

{"title":"High-Voltage Discharge Optimization of a Hybrid-Wall Hall Thruster","authors":"Xingyu Liu, Hong Li, Xingdong Che, Shangmin Wang, Wei Mao, Yongjie Ding, Liqiu Wei, Daren Yu","doi":"10.2514/1.b39061","DOIUrl":"https://doi.org/10.2514/1.b39061","url":null,"abstract":"Journal of Propulsion and Power, Ahead of Print. <br/>","PeriodicalId":16903,"journal":{"name":"Journal of Propulsion and Power","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140842232","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":"Stochastic Equilibrium Analysis to Optimize Solid Propellant Combustion Gas Composition","authors":"Quentin Michalski, Adrian Pudsey","doi":"10.2514/1.b39318","DOIUrl":"https://doi.org/10.2514/1.b39318","url":null,"abstract":"Solid fuel ducted rockets operate with two-stage combustion. The first stage generates burnt products from the combustion of a fuel-rich solid propellant. In the second stage, those combustion products react with air and are ejected through a nozzle to produce thrust. The combustion efficiency of such a device strongly influences its performance and depends on the composition of the rich-fuel-burnt pyrolysis products. This study investigates the sensitivity of carbon, hydrogen, oxygen, and nitrogen (CHON) solid fuels’ burnt product composition to the fuel properties, composition, and heat of formation. The calculations are performed assuming adiabatic, isobaric chemical equilibrium on synthetic species. Existing species’ properties constrain the properties of the synthetic species. The trends of formation of the main species observed in gas generators, i.e., [Formula: see text], [Formula: see text], CO, [Formula: see text], [Formula: see text], [Formula: see text], and solid carbon, are presented. The sensitivity of the molar concentration ratio [Formula: see text] of [Formula: see text] to [Formula: see text] to the oxygen balance and propulsive properties is compared with an example of gas generator propellants. Recommendations for the possible optimization of fuel composition are formulated. For blends of the existing CHON species reported in the literature, it is shown that improving [Formula: see text] is only possible by degrading the specific impulse.","PeriodicalId":16903,"journal":{"name":"Journal of Propulsion and Power","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140658801","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":"Investigation of Unsteady Combustion Regimes in a Kerosene-Fueled Scramjet with Air Throttling","authors":"Ye Tian, Guangming Du, Yanguang Yang, Jialing Le, Hong Liu","doi":"10.2514/1.b39424","DOIUrl":"https://doi.org/10.2514/1.b39424","url":null,"abstract":"<p>This paper describes an experimental study investigating unsteady combustion regimes in a kerosene-fueled scramjet. The results are obtained under inflow conditions of a 2.9 MPa stagnation pressure, 1900 K stagnation temperature, and a Mach number of 3.0. The air throttling position is 240 mm downstream of the combustor entrance, with an air throttling flow rate (ratio of air throttling mass flux to inflow mass flux) of 38% and a fuel equivalence ratio of 0.37. Combustion is relatively stable when air throttling is applied and is dominated by auto-ignition. When air throttling is turned off, the combustion becomes more unsteady and is dominated by flame propagation. At the same time, the combustion mode changes, and the frequency of the combustion mode transition is 286 Hz. Schlieren images and one-dimension analysis show that the effect of air throttling is the coupling of cold throat (aerodynamic throat) and hot throat (thermal throat). The proper orthogonal decomposition and dynamic mode decomposition analysis present that when air throttling is applied or removed, the frequencies of injector–flame feedback are almost the same, while the frequencies of shock–flame feedback exhibit considerable variation, which is caused by the location of the precombustion shock affected by air throttling.</p>","PeriodicalId":16903,"journal":{"name":"Journal of Propulsion and Power","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140567736","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":"Effects of Thermal Expansion and Pressure on Far-Field Fluctuations of Heterogeneous Propellants","authors":"Kevin C. Brown, Thomas L. Jackson","doi":"10.2514/1.b39373","DOIUrl":"https://doi.org/10.2514/1.b39373","url":null,"abstract":"<p>In this work, we carry out three-dimensional mesoscale simulations of heterogeneous solid propellant combustion. We solve the reactive low-Mach-number equations in the gas phase with complete coupling to the solid phase. The model takes into account thermal expansion and deformation in the solid phase by using a hypoelastic law in the quasi-static limit. To account for morphology, we select two different propellant formulations with different particle size distributions and present the results as a function of pressure. The thermomechanical behavior is accessed by examining quantities such as strain and stress in the propellant as a function of pressure and propellant morphology. We also show that temperature and velocity fluctuations exist in the far field above the propellant surface and that these fluctuations can be significant. To better understand the nature of these fluctuations, we vary the pressure and make relevant plots of normal velocity and temperature probability density functions, as well as time autocorrelations. Such descriptions are necessary to account for the coupling between the mesoscale and the macroscale, where the fluctuations at the mesoscale can affect quantities at the macroscale, such as head-end pressure, trigger parietal vortex shedding, and aeroacoustics.</p>","PeriodicalId":16903,"journal":{"name":"Journal of Propulsion and Power","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140567985","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":"Methodology for Assessing Retrofitted Hydrogen Combustion and Fuel Cell Aircraft Environmental Impacts","authors":"Khaled Alsamri, Jessica De la Cruz, Melody Emmanouilidi, Jacqueline Huynh, Jack Brouwer","doi":"10.2514/1.b39405","DOIUrl":"https://doi.org/10.2514/1.b39405","url":null,"abstract":"<p>Hydrogen (<span><math altimg=\"eq-00001.gif\" display=\"inline\" overflow=\"scroll\"><mrow><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub></mrow></math></span><span></span>) combustion and solid oxide fuel cells (SOFCs) can potentially reduce aviation-produced greenhouse gas emissions compared to kerosene propulsion. This paper outlines a methodology for evaluating performance and emission tradeoffs when retrofitting conventional kerosene-powered aircraft with lower-emission <span><math altimg=\"eq-00002.gif\" display=\"inline\" overflow=\"scroll\"><mrow><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub></mrow></math></span><span></span> combustion and SOFC hybrid alternatives. The proposed framework presents a constant-range approach for designing liquid hydrogen fuel tanks, considering insulation, sizing, center of gravity, and power constraints. A lifecycle assessment evaluates greenhouse gas emissions and contrail formation effects for carbon footprint mitigation, while a cost analysis examines retrofit implementation consequences. A Cessna Citation 560XLS+ case study shows a 5% mass decrease for <span><math altimg=\"eq-00003.gif\" display=\"inline\" overflow=\"scroll\"><mrow><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub></mrow></math></span><span></span> combustion and a 0.4% mass decrease for the SOFC hybrid, at the tradeoff of removing three passengers. The lifecycle analysis of green hydrogen in aviation reveals a significant reduction in <span><math altimg=\"eq-00004.gif\" display=\"inline\" overflow=\"scroll\"><mrow><msub><mi>CO</mi><mn>2</mn></msub></mrow></math></span><span></span> emissions for <span><math altimg=\"eq-00005.gif\" display=\"inline\" overflow=\"scroll\"><mrow><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub></mrow></math></span><span></span> combustion and SOFC systems, except for natural-gas-produced <span><math altimg=\"eq-00006.gif\" display=\"inline\" overflow=\"scroll\"><mrow><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub></mrow></math></span><span></span> combustion, when compared to Jet-A fuel. However, this environmental benefit is contrasted by an increase in fuel cost per passenger-km for green <span><math altimg=\"eq-00007.gif\" display=\"inline\" overflow=\"scroll\"><mrow><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub></mrow></math></span><span></span> combustion and a rise for natural-gas-produced <span><math altimg=\"eq-00008.gif\" display=\"inline\" overflow=\"scroll\"><mrow><msub><mi mathvariant=\"normal\">H</mi><mn>2</mn></msub></mrow></math></span><span></span> SOFC compared to kerosene. The results suggest that retrofitting aircraft with alternative fuels could lower carbon emissions, noting the economic and passenger capacity tradeoffs.</p>","PeriodicalId":16903,"journal":{"name":"Journal of Propulsion and Power","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140567833","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":"Optimal Liquid Engine Architecture by Performance-Cooling Tradeoff Analysis","authors":"Soma Tauchi, Chihiro Inoue, Zhenying Wang, Yu Daimon, Go Fujii","doi":"10.2514/1.b39409","DOIUrl":"https://doi.org/10.2514/1.b39409","url":null,"abstract":"Journal of Propulsion and Power, Ahead of Print. <br/>","PeriodicalId":16903,"journal":{"name":"Journal of Propulsion and Power","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140204762","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":"Delayed Detached-Eddy Simulations of Rough-Wall Turbulent Reactive Flows in a Supersonic Combustor","authors":"Guillaume Pelletier, Marc Ferrier, Axel Vincent-Randonnier, Dominique Scherrer, Arnaud Mura","doi":"10.2514/1.b39316","DOIUrl":"https://doi.org/10.2514/1.b39316","url":null,"abstract":"Journal of Propulsion and Power, Ahead of Print. <br/>","PeriodicalId":16903,"journal":{"name":"Journal of Propulsion and Power","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140166619","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":"Inlet Guide Vane Stagger Effects on Multistage Compressor Performance and Stall Inception","authors":"Amanda N. Beach, Joseph C. Brown, Nicole L. Key","doi":"10.2514/1.b39247","DOIUrl":"https://doi.org/10.2514/1.b39247","url":null,"abstract":"Journal of Propulsion and Power, Ahead of Print. <br/>","PeriodicalId":16903,"journal":{"name":"Journal of Propulsion and Power","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140106964","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":"Experimental Study on Infrared Radiation Characteristics and Matching Performance of Low-Observable Nozzles","authors":"Jie Shi, Li Zhou, Jianyu Xu, Jingwei Shi, Zhanxue Wang","doi":"10.2514/1.b38879","DOIUrl":"https://doi.org/10.2514/1.b38879","url":null,"abstract":"Journal of Propulsion and Power, Ahead of Print. <br/>","PeriodicalId":16903,"journal":{"name":"Journal of Propulsion and Power","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140106962","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":"Impact of Ammonium Perchlorate Content on Electrically Controlled Gel Polymer Electrolyte Monopropellants","authors":"Harrison Autry, Bradley Gobin, Ryan Marks, Gregory Young, Afrida Anis, Prithwish Biswas, Keren Shi, Yujie Wang, Michael R. Zachariah","doi":"10.2514/1.b39250","DOIUrl":"https://doi.org/10.2514/1.b39250","url":null,"abstract":"Journal of Propulsion and Power, Ahead of Print. <br/>","PeriodicalId":16903,"journal":{"name":"Journal of Propulsion and Power","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140032874","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}