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Refinement of the vibrationally nonequilibrium model using single-trajectory molecular dynamics calculations applied to syngas ignition behind a shock wave

A thermal nonequilibrium model was used to study the processes of ignition and combustion of syngas in air behind a shock wave. Influence of the vibrational efficiency in chemical reactions on the nonequilibrium factors of the reactions and the ignition delay length was considered. Sensitivity analysis was carried out and key reactions were identified, for which, using single-trajectory molecular dynamics calculations within the framework of the density functional theory, the energy release into vibrational degrees of freedom of reverse reaction products was determined, which made it possible to refine the parameters of the vibrational nonequilibrium model, namely, the vibrational efficiency. It was shown that the refinement of this parameter can lead to a change in the calculated syngas ignition delay behind the shock wave by up to 7%.

Keywords: syngas, ignition, thermal nonequilibrium, vibrational energy, molecular dynamics, quantum chemistry

Arsentiev I.V., Sharipov A.S., Loukhovitski B.I.

Advanced seals for gas-turbine engines

The paper generalizes information about designs and operation conditions of advanced radial gas seals for gasturbine engines. A feature of the new seals is clearance closing by flexible parts that can slide on rotor surface or floating on gas film over one. Main benefits, disadvantages and technology readiness level for different seals are defined. Mathematical simulation approaches to advanced floating seal calculation are discussed.

Keywords: brush seal, finger seal, leaf seal, pressure activated leaf seal, film-riding seal, radial clearance, gas leakage, mathematical simulation

Temis Yu.М., Selivanov A.V.

Engineering method for estimating a total pressure recovery factor in a duct with subsonic conditions

An approximate approach to determining total pressure recovery factor of a subsonic gas flow in a duct, which considers changes in the flow parameters at the inlet, is examined.

Keywords: hydraulic losses in a duct, calculation of hydraulic losses, total pressure recovery factor

Shlyakotin V.E.

Method of selecting intershaft bearing’s radial clearance to eliminate a slip-type defect

The choice of radial clearance at which the bearing can operate without defects depends on rotational speed of rings, their temperature and values of loads acting on the bearing. The correct choice of radial clearance is especially important for intershaft bearings, in which both inner and outer rings rotate. The article examines variation in radial clearance of an intershaft bearing for three different operating conditions: when the outer ring rotates more rapidly, when the inner ring rotates more rapidly, and when the outer ring is stationary. It is shown that the radial clearance should be selected differently in each case depending on operating conditions. Load distribution over rolling elements, which depends on value of radial clearance at different radial loads, is considered. Based on the analysis, a method of selecting initial radial clearance in an intershaft bearing was formed, which considers its operating conditions in order to eliminate a defect of the “slip” type.

Keywords: bearing, shaft bearing, radial clearance, slip defect

Lavrentev Yu.L.

Mathematical simulation of defect formation in parts produced by diffusion bonding

A review of approaches to mathematical simulation of void closure during diffusion bonding is carried out. Kinetics of void closure are simulated for different parameters of technological process and quality of workpiece processing. Finite element simulation of void closure is carried out using the material superplasticity model. Fatigue plots are presented for void chains of radial and longitudinal orientation, which can occur in bond seams of a hollow blade.

Keywords: diffusion bonding, superplasticity, mathematical simulation, void closure

Temis Yu.М., Khudyakov A.P., Khudyakova A.D.

Estimation of the influence of air bypass along the length of the combustion chamber on efficiency of operating process in a model rig with energy-intensive condensed materials

The two-zone burning process is one of the most effective ways to organize the afterburning of gas generation products containing a large amount of condensed phase. Results of experimental research on the influence of several options for redistributing air supply to the model rig’s combustion chamber on the value of combustion efficiency are presented. The range of operation modes of the model rig’s combustion chamber is shown, where the presented methods have shown good efficiency.

Keywords: model combustion chamber, distributed air supply, combustion efficiency, energy-intensive condensed material

Surikov E.V., Sharov M.S., Kolomentsev P.A., Alekseeva O.M.

Active noise suppression in the model of turbofan intake duct

Issues of active suppression of a fan’s acoustic radiation are investigated in relation to the problem of noise reduction in aircraft engines. Results of experimental study of quasi-monochromatic radiation suppression in the inlet of an aircraft engine fan model are presented. It was found that in the frequency range of 400…1600 Hz the radiation levels of quasi-monochromatic acoustic signals in the front hemisphere are suppressed by 14…21 db.

Keywords: active noise damping, active sound suppression, compensation of acoustic vibrations, turbofan engine fan noise, sound in cylindrical tubes, acoustic mode

Korotin P.I., Potapov O.A., Fiks G.E., Fiks I.S., Pochkin Ia.S., Khaletskii I.D.