Numerical and Experimental Studies on Combustion Engines and Vehicles最新文献

Numerical Investigation of the Shock Train in a Scramjet with the Effects of Back-Pressure and Divergent Angles 考虑背压和发散角影响的超燃冲压发动机激波串数值研究

Numerical and Experimental Studies on Combustion Engines and Vehicles Pub Date : 2020-11-26 DOI: 10.5772/intechopen.92555

Santhosh Kumar Gugulothu, B. Bhaskar, V.V. Phani Babu

{"title":"Numerical Investigation of the Shock Train in a Scramjet with the Effects of Back-Pressure and Divergent Angles","authors":"Santhosh Kumar Gugulothu, B. Bhaskar, V.V. Phani Babu","doi":"10.5772/intechopen.92555","DOIUrl":"https://doi.org/10.5772/intechopen.92555","url":null,"abstract":"Numerical simulations are carried out to study the effect of divergence angle and adverse pressure gradient on the movement of shock wave train in a scramjet isolator. The commercial software tool ANSYS Fluent 16 was used to simplify two dimensional Reynolds averaged Navier Stokes equation with compressible fluid flow by considering the density-based solver with standard K-ε turbulence model. The species transport model with single step volumetric reaction mechanism is employed. Initially, the simulated results are validated with experimental results available in open literature. The obtained results show that the variation of the divergence angle and back pressure on the scramjet isolator has greater significance on the flow field. Also, with an increase in the back pressure, due to the intense turbulent combustion, the shock wave train developed should expand along the length and also moves towards the leading edge of the isolator leading to rapid rise in the pressure so that the pressure at the entrance of the isolator can match the enhanced back pressures.","PeriodicalId":398949,"journal":{"name":"Numerical and Experimental Studies on Combustion Engines and Vehicles","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126766305","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}

引用次数: 2

Investigation of the Gasoline Engine Performance and Emissions Working on Methanol-Gasoline Blends Using Engine Simulation 基于发动机仿真的甲醇-汽油混合燃料汽油机性能与排放研究

Numerical and Experimental Studies on Combustion Engines and Vehicles Pub Date : 2020-06-19 DOI: 10.5772/INTECHOPEN.92858

S. Iliev

引用次数: 4

Stability Analysis of Long Combination Vehicles Using Davies Method 基于Davies方法的长组合车辆稳定性分析

Numerical and Experimental Studies on Combustion Engines and Vehicles Pub Date : 2020-06-18 DOI: 10.5772/intechopen.92874

G. G. M. Contreras, R. Vieira, D. Martins

{"title":"Stability Analysis of Long Combination Vehicles Using Davies Method","authors":"G. G. M. Contreras, R. Vieira, D. Martins","doi":"10.5772/intechopen.92874","DOIUrl":"https://doi.org/10.5772/intechopen.92874","url":null,"abstract":"The cargo transportation in the world is mostly dominated by road transport, using long combination vehicles (LCV’s). These vehicles offer more load capacity, which reduces transport costs and thus increases the efficiency and competitiveness of companies and the country. But the tradeoff of LCV’s is their low lateral stability and propensity to roll over, which has been the focus of many studies. Most vehicle stability models do not consider the longitudinal aspects of the vehicle and the road, such as the stiffness of the chassis, the gravity center location, and the longitudinal slope angle of the road. But, the use of three-dimensional models of vehicles allows a more rigorous analysis of vehicle stability. In this context, this study aims to develop a three-dimensional mechanism model representing the last trailer unit of an LCV under an increasing lateral load until it reaches the rollover threshold. The proposed model considers the gravity center movement of the trailer, which is affected by the suspension, tires, fifth-wheel, and the chassis. Davies method has proved to be an important tool in the kinetostatic analysis of mechanisms, and therefore it is employed for the kinetostatic analysis of the three-dimensional mechanism of the trailer.","PeriodicalId":398949,"journal":{"name":"Numerical and Experimental Studies on Combustion Engines and Vehicles","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132313065","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}

引用次数: 0

Effects of Biodiesel Blends Varied by Cetane Numbers and Oxygen Contents on Stationary Diesel Engine Performance and Exhaust Emissions 十六烷数和氧含量对固定式柴油机性能和废气排放的影响

Numerical and Experimental Studies on Combustion Engines and Vehicles Pub Date : 2020-05-23 DOI: 10.5772/intechopen.92569

Semakula Maroa, F. Inambao

{"title":"Effects of Biodiesel Blends Varied by Cetane Numbers and Oxygen Contents on Stationary Diesel Engine Performance and Exhaust Emissions","authors":"Semakula Maroa, F. Inambao","doi":"10.5772/intechopen.92569","DOIUrl":"https://doi.org/10.5772/intechopen.92569","url":null,"abstract":"This work investigated waste plastic pyrolysis oil (WPPO), 2-ethyl hexyl nitrate (EHN), and ethanol as sources of renewable energy, blending conventional diesel (CD), WPPO, and ethanol with EHN was to improve the combustion and performance characteristics of the WPPO blends. EHN has the potential to reduce emissions of CO, CO2, UHC, NOX, and PM. Ethanol improves viscosity, miscibility, and the oxygen content of WPPO. Mixing ratios were 50/WPPO25/E25, 60/WPPO20/E20, 70/WPPO15/E15, 80/WPPO10/E10, and 90/WPPO5/E5 for CD, waste plastic pyrolysis oil, and ethanol, respectively. The mixing ratio of EHN (0.01%) was based on the total quantity of blended fuel. Performance and emission characteristics of a stationary 4-cylinder water-cooled diesel Iveco power generator were evaluated with ASTM standards. At 1000 rpm, the BSFC was 0.043 kg/kWh compared to CD at 0.04 kg/kWh. Blend 90/WPPO5/E5 had the highest value of 14% for BTE, while the NOX emissions for 90/WPPO5/E5, 80/WPPO10/E10, and 70/WPPO15/E15 were 384, 395, and 414 ppm, respectively, compared to CD fuel at 424 ppm. This is due to their densities of 792 kg/m3, 825 kg/m3 which are close to CD fuel at 845 kg/m3 and the additive EHN. These results show blends of WPPO, ethanol and EHN reduce emissions, and improve engine performance, mimicking CD fuel.","PeriodicalId":398949,"journal":{"name":"Numerical and Experimental Studies on Combustion Engines and Vehicles","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122607080","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}

引用次数: 3

Knock Suppression of a Spark-Ignition Aviation Piston Engine Fuelled with Kerosene 以煤油为燃料的火花点火航空活塞发动机的爆震抑制

Numerical and Experimental Studies on Combustion Engines and Vehicles Pub Date : 2020-03-31 DOI: 10.5772/intechopen.91938

E. Wang, Chenyao Wang, Fujun Zhang, Huasheng Cui, Chuncun Yu, Bolan Liu, Zhenfeng Zhao, Changlu Zhao

引用次数: 0

A New Combustion Method in a Burner with Three Separate Jets 一种新的三喷嘴燃烧器燃烧方法

Numerical and Experimental Studies on Combustion Engines and Vehicles Pub Date : 2020-01-23 DOI: 10.5772/intechopen.90571

M. A. Mergheni, Mohamed Mahdi Belhajbrahim, T. Boushaki, J. Sautet

{"title":"A New Combustion Method in a Burner with Three Separate Jets","authors":"M. A. Mergheni, Mohamed Mahdi Belhajbrahim, T. Boushaki, J. Sautet","doi":"10.5772/intechopen.90571","DOIUrl":"https://doi.org/10.5772/intechopen.90571","url":null,"abstract":"Oxy-flames from burners with separated jets present attractive perspectives because the separation of reactants generates a better thermal efficiency and reduction of pollutant emissions. The principal idea is to confine the fuel jet by oxygen jets to favor the mixing in order to improve the flame stability. This chapter concerns the effect of equivalence ratio on characteristics of a non-premixed oxy-methane flame from a burner with separated jets. The burner of 25 kW power is composed with three aligned jets, one central methane jet surrounded by two oxygen jets. The numerical simulation is carried out using Reynolds Average Navier-Stokes (RANS) technique with k-ε as a turbulence closure model. The eddy dissipation model is applied to take into account the turbulence-reaction interactions. The study is performed with different global equivalence ratios (0.7, 0.8 and 1). The validation of the numerical tools is done by comparison with experimental data of the stoichiometric regime (Ф = 1). The two lean regimes of Ф = 0.7 and 0.8 are investigated only by calculations. The velocity fields with different equivalence ratio are presented. It yields to increase of longitudinal and transverse velocity, promotes the fluctuation in interaction zone between fuel and oxygen also a better mixing quality and a decrease of the size of the recirculation zone.","PeriodicalId":398949,"journal":{"name":"Numerical and Experimental Studies on Combustion Engines and Vehicles","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133046315","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}

引用次数: 1