The problem of breakup of a liquid fuel in a crossflow finds relevance in applications such as lean premixed prevaporized (LPP) ducts, afterburners for gas turbines and combustors for ramjets and scramjets. Combustion efficiency and pollutant formation are directly determined by the efficient mixing of the fuel/air mixture, which is in turn controlled by the breakup of the fuel jet. Liquid jet ...

Methyl-decanoate (MD) is an important surrogate fuel component representing the methyl-ester fraction in biodiesel. In recent years different experimental studies using MD as fuel were reported; detailed as well as reduced mechanisms were developed for both improving our kinetic understanding and engineering applications. Jet stirred reactor (JSR) experiments were performed by Dagaut et al. (20...

We present the development of a new underwater laser cutting process in which a water-jet has been used along with the laser beam to remove the molten material through kerf. The conventional underwater laser cutting usually utilizes a high pressure gas jet along with laser beam to create a dry condition in the cutting zone and also to eject out the molten material. This causes a lot of gas bubb...

Because the amount of fuel usage is huge, and exhaust emissions of commercial transports is regulated under the Kyoto Protocol, how to reduce fuel consumption is an urgent problem for all airlines. The airlines urgently need a practical method to reduce fuel consumptions within constraints to accomplish the mission. The objective for the present paper is to use a model-based method and flight d...

This study examines the droplet combustion characteristics of three and four component miscible liquid mixtures and compares the results with an aviation fuel (Jet-A) burning under the same conditions. The configuration used in the comparison is the base case of spherical symmetry whereby the droplet and flame are spherical and concentric. Mixtures consisting of n-decane/iso-octane/toluene and ...

Temperature fluctuations have been measured in a turbulent, natural gas-fueled, piloted jet diffusion flame with a fuel jet exit Reynolds number of 9700, using broadband Coherent Anti-Stokes Raman Spectroscopy (CARS) nitrogen thermometry with a best spatial resolution of 0.9 mm. Radial profiles of mean temperature and root mean square (rms) temperature fluctuations have been acquired and temper...

Flashing or thermodynamic breakup of a liquid jet occurs when a pressurized subcooled or saturated liquid is released to a lower pressure, resulting in violent vapor nucleation, expansion, and break up of the liquid phase. Flashing is known to produce very fine droplet atomization, often not possible by traditional mechanical means. In this work, flashing atomization is introduced in a spray bu...

Experiments have been carried out to measure the spark ignition energy of Jet A vapor in air. A range of ignition energies from 1 mJ to 100 J was examined in these tests. The test method was validated by first measuring ignition energies for lean mixtures of the fuels hexane (C6H6) and propane (C3H8) in air at normal temperature (295 K) and pressure (1 atm). These results agree with existing da...

Challenges in forecasting fleet development and deployment are in part due to fuel price uncertainty. To address this issue, a recent study developed an aircraft-specific Leontief technology operating cost model (LM) to compare aircraft costs under fuel price uncertainty. This model considers individual aircraft types to be Leontief technologies, such that the key drivers of cost must be used i...

Bio-jet fuels prepared by the thermochemical conversion of triglyceride can be used as complete substitutes jet fuels. A bio-jet fuel a substitute RP-3 and itself were, respectively, to small aviation piston engine. The characteristic tests engine were carried out, performances power, economy, emissions, heat release law fueled with two analyzed. feasibility for was proved experimental results,...