نتایج جستجو برای: jet injection angle
تعداد نتایج: 320441 فیلتر نتایج به سال:
In this paper, A numerical study has been conducted to predict the hydrodynamic characteristics of the staggered ribbed backward facing step flow with inclined impinging jet. The impinging jet flow was inclined towards the main cross flow and the angle of inclination is ranged from 30 to 90 . The ribs were in staggered arrangement and aligned after the slot jet in normal direction to the ma...
The variable-area pintle injector has unique geometry and spray characteristics compared to traditional coaxial injectors, is advantageous for weight lightening deep throttling of liquid rocket engines. To obtain an accurate prediction the windward distribution a gas–liquid with discrete radial orifices, element using air water as simulants was designed experiments in atmospheric environment. a...
Achromatic breaks in afterglow light curves of gamma-ray bursts (GRBs) arise naturally when the product of the jet’s Lorentz factor γ and opening angle Θ j satisfies γΘ j ≫ 1. Magnetohydrodynamic (MHD) simulations of collimated GRB jets generally give γΘ j . 1, suggesting that MHD models are incapable of explaining jet breaks. We work within the collapsar paradigm and use axisymmetric relativis...
We investigate the effect that the structure of GRB jets has on the afterglow light curves for observers located at different viewing angles, θobs, from the jet symmetry axis. The largest uncertainty in the jet dynamics is the degree of lateral energy transfer. Thus, we use two simple models, that make opposite and extreme assumptions for this point, and calculate the light curves for an extern...
We propose a method to estimate the pseudo jet opening half-angle of GRBs using the spectral peak energy (Ep)–peak luminosity relation (so called Yonetoku relation) as well as the Ep–collimation-corrected γ-ray energy relation (so called Ghirlanda relation). For bursts with known jet break times and redshifts, we compared the pseudo jet opening half-angle with the standard one and found that th...
High-pressure noble gas jet injection is a mitigation technique which potentially satisfies the requirements of fast response time and reliability, without degrading subsequent discharges. Previously reported gas jet experiments on DIII-D showed good success at reducing deleterious disruption effects. In this paper, results of recent gas jet disruption mitigation experiments on Alcator C-Mod an...
An increasing number of blazars have been reported to show jet wobbling (i.e., non-regular rotations of the structural position angle of their innermost jets in the plane of the sky with amplitudes between 20 deg. and 50 deg., and time scales between 2 yr. and 20 yr.). The physical origin for the observed jet wobbling is still poorly understood, but as this phenomenon is triggered in the innerm...
The suspension plasma spraying process is investigated by using shadow imaging techniques to appreciate the different trajectories of the liquid jet interacting with a DC highenergy plasma flow. Then, the modelling of different liquid injections (isolated droplet, train of droplets and continuous jet) helps to determine which injection type must be preferred. From that, coating depositions have...
We present new images of the two-sided VLBIstructure of the radio galaxy CygnusA at 1.6GHz, 22GHz and 43GHz. The maps show the jet and counter-jet of CygnusA on scales from ∼ 400 to 0.1 milliarcseconds, corresponding to projected sizes of ∼ 300 pc to 0.07 pc. Our best 22GHz image shows a small (few degree) misalignment of the VLBI-jets with the kpc-jets, longitudinal oscillations of the jet’s r...
BACKGROUND Pain and needle-phobia can be a problem during the application of local anesthesia with syringe and needle. OBJECTIVE To evaluate a jet-injection device (without needle) to deliver local anesthesia. METHODS Two hundred and six minor dermatological procedures using a jet-injection device for administering local anesthesia into skin tissue were performed. We comment on the technica...
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