... computational heat transfer internal flow jets swirling turbines In order to further increase the efficiency and power, gas temperature at gas turbine inlet becomes extremely high which is far beyond the thermal limit of the material. Thus, cooling technique is critical to protect the blade...

...Georg Fink; Michael Jud; Thomas Sattelmayer In this paper, pilot-ignited high pressure dual-fuel combustion of a natural gas jet is investigated on a fundamental basis by applying two separate single-hole injectors to a rapid compression expansion machine (RCEM). A S hadowgraphy system is used...

... transfer Design optimization Droplet Environmental Evaporation Experimental Jets Mass Transfer Sprays Thermodynamics Two-phase Vaporization Marine diesel engines operate at high temperatures and use heavy oil with high sulfur content [ 1 ]. This leads to high emissions of nitrogen oxides...

..., 2018. Assoc. Editor: Haixin Chen. 03 07 2017 06 11 2017 Aerodynamics Computational fluid dynamics Internal flow Jets Swirling The recent advancement of heat-seeking missiles and radar seekers has highly increased the vulnerability of fighters propelled by turbojets...

... properties of a combustion system. Nevertheless, the PVC can lead to an increase of turbulence and therefore may improve mixing [ 3 ]. For these and other reasons, the PVC has increasingly been in the focus of research during the last years. Finite element Jets Shear Flows Turbulence Unsteady...

...Michael Severin; Oliver Lammel; Holger Ax; Rainer Lückerath; Wolfgang Meier; Manfred Aigner; Johannes Heinze A model FLOX ® combustor, featuring a single high momentum premixed jet flame, has been investigated using laser diagnostics in an optically accessible combustion chamber at a pressure of 8...

..., thermoacoustic instabilities, and pollutant emissions is still unclear. In order to identify and investigate these mechanisms, the PVC needs to be controlled effectively with a feedback control system. A previous study successfully applied feedback control in a generic swirling jet setup. The next step...

.... 03 07 2017 24 07 2017 Combustion Experimental Flame Gas turbine technology Jets Shear Flows Unsteady flows Hydrogen-rich fuels can play a major role in achieving de-carbonization targets in power generation systems with minimal Co 2 emissions and minimal environmental...

... through two synchronized perpendicular cameras was applied on the KIAI-Spray linear multi-injector burner. Four different injector-to-injector distances and four fuels of different volatilities ( n -heptane, n -decane, n -dodecane, and jet-A1 kerosene) were evaluated. Spray branches and interinjector...

...Andreas Schwärzle; Thomas O. Monz; Andreas Huber; Manfred Aigner Jet-stabilized combustion is a promising technology for fuel flexible, reliable, highly efficient combustion systems. The aim of this work is a reduction of NO x emissions of a previously published two-stage micro gas turbine (MGT...

... little to no effect on the ignition delay. Higher intake pressure was shown to increase ignition delay due to the effect of swirl momentum on fuel jet development, air entrainment, and jet deflection away from optimal contact with the glow plug ignition source. Analysis of combustion was carried out...

... deployable mechanism on a full-scale, mixed-exhaust, medium-bypass-ratio business jet engine (Williams International FJ44-4A) operating at the upper end of typical approach throttle settings. The final prototype design satisfied a set of critical technology demonstration requirements that included (1...

... of this computational fluid dynamics (CFD) study is to identify the effect of a given piston cooling nozzle (PCN) geometry on the cooling oil jet spreading phenomenon. The scope of this study is to develop a numerical setup using the open-source CFD toolkit OpenFoam ® for measuring the magnitude of oil jet spreading...

... of Water Jet Into Air ,” 5th International Conference on Multiphase Flow ( ICMF ), Yokohama, Japan, May 30–June 4, Paper No. 377. [7] Battistoni , M. , Xue , Q. , and Som , S. , 2014 , “ Effect of Off-Axis Needle Motion on Internal Nozzle and Near Exit Flow in a Multi-Hole Diesel...

...Liwei Zhang; Vigor Yang The present work extends Part I of our study to investigate the flow dynamics and scalar mixing of a turbulent gaseous jet in an oscillating crossflow. Attention is first given to intrinsic flow instabilities under a steady condition. Both power spectral density and proper...

...Liwei Zhang; Vigor Yang A large-eddy-simulation-based numerical investigation of a turbulent gaseous jet in crossflow (JICF) is presented. The present work focuses on cases with a steady crossflow and two different jet-to-crossflow velocity ratios, 2 and 4, at the same jet centerline velocity...

...; final manuscript received September 25, 2016; published online January 18, 2017. Assoc. Editor: Eric Petersen. 21 06 2016 25 09 2016 Aeronautical propulsion Cavities Computational fluid dynamics Internal flow Jets Separated Unsteady flows Aerospace Propulsion systems...

... as a flow tracer, indicate that the effectiveness levels on the stator and rotor side of the cavity depend on the mass and momentum flux ratios of the purge jets relative to the swirl velocity. For a given purge flow rate, fewer purge holes resulted in better sealing than the case with a larger number...

...Lothar Rukes; Moritz Sieber; C. Oliver Pashereit; Kilian Oberleithner Swirling jets undergoing vortex breakdown are widely used in combustion applications, due to their ability to provide aerodynamic flame stabilization. It is well known that vortex breakdown is accompanied by a dominant coherent...

... , 126 ( 3 ), pp. 656 – 664 . 10.1115/1.1762906 [12] Birch , A. D. , Brown , D. R. , Dodson , M. G. , and Swaffield , F. , 1984 , “ The Structure and Concentration Decay of High Pressure Jets of Natural Gas ,” Combust. Sci. Technol. , 36 ( 5–6 ), pp. 249 – 261 . 10.1080...