... 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...

... of 70 μ m for the droplets, the reduction of liquid mass due to evaporation is about 3–10% depending on the gas temperature (OP1 - OP4) up to the catalyst front surface (see Fig. 3 right side). The average velocity is calculated from the jet model (mean velocity at the axis in combination...

... Diffuser Design and Performance for Advanced Fighter Aircraft,” AIAA Paper No. 1985-3073. 10.2514/6.1985-3073 [26] Sun , X.-L. , Wang , Z.-X. , Zhou , L. , Shi , J.-W. , and Cheng , W. , 2017 , “ Internal Flow and External Jet Characteristics of Double Serpentine Nozzle...

... of the primary injector and that it decays rapidly thereafter explains why PIV measurements could not capture the instability since visual access in the interior of the swirler is not possible. Fig. 6 PVC modes based on LES/DMD and LSA; right column: global LSA adjoint modes Finite element Jets...

...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...

... Collisions ,” Int. J. Multiphase Flow , 31 ( 9 ), pp. 1015 – 1035 . 10.1016/j.ijmultiphaseflow.2005.05.010 [6] Pan , Y. , and Suga , K. , 2004 , “ Direct Simulation of Water Jet Into Air ,” 5th International Conference on Multiphase Flow ( ICMF ), Yokohama, Japan, May 30–June 4, Paper...

...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...

... 02 2016 28 06 2016 Computational fluid dynamics Internal combustion engines Internal flow Jets Mixed Process Modeling CNG, one of the most promising alternative fuels, is widely used in engines due to its rich resource and cheap price [ 1 ]. Although the direct injection...