INFLUENCE OF SUPPLYING GASEOUS FUEL METHOD ON THE EFFICIENCY OF ITS COM¬BUSTION IN COMBUSTION CHAMBER OF GAS TURBINE ENGINE

The article describes the solution of the problem with overestimated carbon monoxide concentration in exhaust gases of the NK-16ST gas turbine engine by modifying the supplying fuel method in the combustion chamber. The nozzle with jet fuel supply, for which reason the calculation is made and the optimum number of holes and its diameters are determined. The nozzles with twist and jet fuel supply are researched. As a result of the study it is revealed that the jet fuel supply allows to reduce carbon monoxide concentration in exhaust gases of the engine

NUMERICAL SIMULATION ОF THE WORKING PROCESSES IN THE COMBUSTION CHAMBERS OF GAS TURBINE ENGINES TAKING INTO ACCOUNT THE HEAT EXCHANGE WITH THE WALLS

Computational analysis using modern CFD packages of the workflow parameters in the combustion chambers of gas turbine engines taking into account the conjugate heat exchange

Magnetic field-induced dissipation-free state in superconducting nanostructures

A superconductor in a magnetic field acquires a finite electrical resistance caused by vortex motion. A quest to immobilize vortices and recover zero resistance at high fields made intense studies of vortex pinning one of the mainstreams of superconducting research. Yet, the decades of efforts resulted in a realization that even promising nanostructures, utilizing vortex matching, cannot withstand high vortex density at large magnetic fields. Here, we report a giant reentrance of vortex pinning induced by increasing magnetic field in a W-based nanowire and a TiN-perforated film densely populated with vortices. We find an extended range of zero resistance with vortex motion arrested by self-induced collective traps. The latter emerge due to order parameter suppression by vortices confined in narrow constrictions by surface superconductivity. Our findings show that geometric restrictions can radically change magnetic properties of superconductors and reverse detrimental effects of magnetic field

Iron monoxide photodissociation

Contains fulltext : 32657.pdf (publisher's version ) (Open Access

Photodissociation of van der waals clusters of isoprene with oxygen, c5h8-o-2, in the wavelength range 213-277 nm

Contains fulltext : 103618.pdf (publisher's version ) (Open Access

Comment on "Unraveling the mysteries of metastable O-4 J. Chem. Phys. 110, 6095 (1999)

Contains fulltext : 60226.pdf (publisher's version ) (Open Access

Weakly Bound Environment of Molecular Oxygen as a Catalyst of Photooxidation

Contains fulltext : 219174.pdf (publisher's version ) (Closed access

ОСОБЕННОСТИ ОРГАНИЗАЦИИ ПРОЦЕССОВ В УКОРОЧЕННЫХ КАМЕРАХ СГОРАНИЯ АВИАЦИОННОГО КОНВЕРТИРОВАННОГО ГТД

This article is aimed at demonstrating design features and combustion process organization of the shortened combustion chamber installed at NK-16ST gas turbine engine. It shows the influence of the new burner design and shorter flame tube on the environmental performance of the engine. There was introduced the way of improving environmental characteristics of the gas turbine engine with minimal changes to the original design of the combustion chamber. Service characteristics, starting properties and general performance of the engine stay the same. В статье описываются особенности конструкции и организации процессов в укорочен­ных камерах сгорания на примере газотурбинной установки НК-16СТ. Показано влияние конструкции горелочного устройства, сокращение длины жаровой трубы на эмиссионные характеристики двигателя. Предложен эффективный способ улучшения эмиссионных характеристик конвертированного авиационного газотурбинного двигателя путем мини­мального изменения конструкции камеры сгорания, сохраняя при этом эксплуатационные свойства и заложенные характеристики двигателя, а также его пусковые качества.

ЭТАПЫ МОДЕРНИЗАЦИИ КАМЕРЫ СГОРАНИЯ ГТД СО СТУПЕНЧАТЫМ ПОДВОДОМ ВОЗДУХА ПО ДЛИНЕ ЖАРОВОЙ ТРУБЫ

This article describes improvements made to the NK-16STgas turbine engine main combustor. Different researches results are represented. These results include burner and flame tube design affection on the characteristics of the main combustor and redistribution of the holes alongside flame tube. In order to decrease toxic emission «dry» method is used, that requires no use of water, vapor or ammonium hydrate injection.Measures listed above allow to reduce toxic emission significantly comparing to the serial main combustor.В статье описываются этапы модернизации серийной камеры сгорания газотурбинной установки НК-16СТ. Исследуется, влияние  конструкции горелочного устройства, перераспределение отверстий по длине жаровой трубы, изменение конструкции жаровой трубы на основные характеристики камеры сгорания. Подавление токсичных выбросов осуществляется «сухим» методом, т.е. без впрыска воды, пара или аммиака в тракт камеры сгорания. Данные мероприятия были проведены с целью улучшения экологических характеристик ГТУ, что позволило значительно снизить уровень выбросов токсичных веществ по сравнению с серийной КС.

Cluster-enhanced X-O-2 photochemistry (X=CH3I, C3H6, C6H12, and Xe)

Contains fulltext : 34995.pdf (publisher's version ) (Open Access)The effect of a local environment on the photodissociation of molecular oxygen is investigated in the van der Waals complex X-O-2 (X=CH3I, C3H6, C6H12, and Xe). A single laser operating at wavelengths around 226 nm is used for both photodissociation of the van der Waals complex and simultaneous detection of the O(P-3(J),J=2,1,0) atom photoproduct via (2+1) resonance enhanced multiphoton ionization. The kinetic energy distribution (KED) and angular anisotropy of the product O atom recoil in this dissociation are measured using the velocity map imaging technique configured for either full ("crush") or partial ("slice") detection of the three-dimensional O(P-3(J)) atom product Newton sphere. The measured KED and angular anisotropy reveal a distinct difference in the mechanism of O atom generation from an X-O-2 complex compared to a free O-2 molecule. The authors identify two one-photon excitation pathways, the relative importance of which depends on IPx, the ionization potential of the X partner. One pathway, observed for all complexes independent of IPx, involves a direct transition to the perturbed covalent state X-O-2(A('3)Delta(u)) with excitation localized on the O-2 subunit. The predominantly perpendicular character of this channel relative to the laser polarization detection, together with data on the structure of the complex, allows us to confirm that X partner induced admixing of an X+-O-2(-) charge transfer (CT) state is the perturbing factor resulting in the well-known enhancement of photoabsorption within the Herzberg continuum of molecular oxygen. The second excitation pathway, observed for X-O-2 complexes with X=CH3I and C3H6, involves direct excitation into the (3)(X+-O-2(-)) CT state of the complex. The subsequent photodissociation of this CT state by the same laser pulse gives rise to the superoxide anion O-2(-), which then photodissociates, providing fast (0.69 eV) O atoms with a parallel image pattern. Products from the photodissociation of singlet oxygen O-2(b (1)Sigma(+)(g)) are also observed when the CH3I-O-2 complex was irradiated. Potential energy surfaces (PES) for the ground and relevant excited states of the X-O-2 complex have been constructed for CH3I-O-2 using the results of CASSCF calculations for the ground and CT states of the complex as well as literature data on PES of the subunits. These model potential energy surfaces allowed us to interpret all of the observed O(P-3(J)) atom production channels. (c) 2007 American Institute of Physics