NUMERICAL SIMULATION OF THE LIGHT AIRCRAFT PROPELLER NOISE UNDER STATIC CONDITION

Akustika ◽  
2021 ◽  
pp. 100-106
Author(s):  
sergey Timushev ◽  
Alexey Yakovlev ◽  
Petr Moshkov
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Numerical Modeling ◽  
Vortex Method ◽  
Static Condition ◽  
Semiempirical Model ◽  
Calculation Methods ◽  
Propeller Noise ◽  
Calculation Results ◽  
Static Conditions

The problem of simulation the noise generated during the operation of the propeller is considered. Calculation methods are described and numerical simulation of the noise of a light aircraft propeller by the acoustic-vortex method is performed. The results of numerical modeling of the tonal components of the propeller noise when operating under static conditions are compared with experimental data and calculation results based on a semiempirical model.

scholarly journals Modernization of the design solution of the horizontal joint of the floor slabs in the beam-free frames using seamless loop-shaped embedded parts

2020 ◽  
Vol 17 (3) ◽  
pp. 55-61
Author(s):  
Yu. V. Mironova ◽  
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Numerical Modeling ◽  
Construction Industry ◽  
Design Solution ◽  
Strain Behavior ◽  
Floor Slabs ◽  
Calculation Results ◽  
Positive Factor ◽  
Horizontal Joint

There is proposed an updated design solution of horizontal joint of the floor slabs for CUB and UIKSS beam-free frames using PFEIFER loop-shaped embedded fixings. On the basis of numerical modeling, the features of its stress strain behavior during shear operation are revealed. The horizontal joint of prefabricated floor slabs with seamless looped-shaped embedded parts has been modernized and an analytical expression to determine its compliance based on the analysis of the results of numerical simulation of the shear has been obtained. There is presented a comparative analysis of the calculation results and experimental data, proving the adequacy and applicability of the proposed calculation expression and the applicability of the design solution. The new design solution of the horizontal joint of floor slabs simplifies the technology of slab installation, and its shear suppleness can be assessed as a positive factor for the construction industry.

Numerical Simulation of Flow over Aerators on the Chute with an Anti-Arc Section by Turbulence Flow Model

2012 ◽  
Vol 256-259 ◽  
pp. 2543-2547
Author(s):  
Yi Min Xu ◽  
Yao Wang ◽  
Ji Rui Hou ◽  
Hua Qiang Wu ◽  
Xian Dong Liu ◽  
...  
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Boundary Conditions ◽  
Flow Model ◽  
Velocity Fields ◽  
Aerated Flow ◽  
Turbulence Flow ◽  
Calculation Results ◽  
Complex Boundary ◽  
Simulation Results

For a flow chute with complex boundary conditions, such as with an anti-arc section, the flow behaviors and characteristics of aeration after the aerator are more complex than that in the straight chute. Based on the k~ε turbulence flow model together with VOF method, flow velocity fields over the aerator on the chute with anti-arc section were numerical simulated. Model experiments were investigated to verify the simulation results. Comparison shows that the calculation results agree well with the observed experimental data. Some factors including radius of the anti arc, aerator’s height and takeoff angel which influence aerated flow are discussed.

scholarly journals NUMERICAL CALCULATION OF STEEL-CONCRETE COMPOSITE BEAMS

2019 ◽  
pp. 175-184
Author(s):  
A. S. Krylov
Keyword(s):  
Experimental Data ◽  
Numerical Modeling ◽  
Concrete Beams ◽  
Crack Opening ◽  
High Strength ◽  
Composite Beams ◽  
Experimental Models ◽  
Vertical Displacements ◽  
Calculation Results ◽  
Opening Width

The paper presents a brief review of test experiments with models of steel-concrete beams made of high-strength concretes. The description is given to models and features of the applied materials. Numerical modeling and calculations are performed for steel-concrete beams. The modeling is performed in two versions: with and without the steel-concrete contact interaction. The calculation results are given numerically and graphically, and loads corresponding to the limiting bearing capacity, vertical displacements, crack opening width, height of the selected compressed zone are obtained. All parameters are evaluated and compared with the experimental data. Numerical and experimental models of destruction are compared. The obtained simulation and numerical results are compared.

scholarly journals Влияние потенциала рассеяния на радиационных дефектах на перенос носителей заряда в GaAs-структурах

2020 ◽  
Vol 54 (9) ◽  
pp. 945
Author(s):  
И.Ю. Забавичев ◽  
А.С. Пузанов ◽  
С.В. Оболенский ◽  
В.А. Козлов
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Charge Carrier ◽  
Radiation Exposure ◽  
Carrier Mobility ◽  
Charge Carrier Mobility ◽  
Model Parameters ◽  
Space And Time ◽  
Calculation Results ◽  
Scattering Potential

A numerical simulation of the charge carrier mobility change after radiation exposure in GaAs structures is performed. For each scattering potential under study, the values of model parameters are determined at which the calculation results are consistent with experimental data. It is demonstrated that differences in scattering potentials become significant in the case of studying overshoot space and time velocity effects.

Discuss of Important Issues in Numerical Simulation for Natural Draft Counter Flow Cooling Tower

2012 ◽  
Vol 516-517 ◽  
pp. 267-270
Author(s):  
Li Song ◽  
Rui Tian ◽  
Song Li ◽  
Ya Hui Wang
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Mass Transfer ◽  
Drop Size ◽  
Cooling Tower ◽  
Drop Diameter ◽  
Atmospheric Density ◽  
Counter Flow ◽  
Natural Draft ◽  
Calculation Results

natural draft counter flow cooling tower heat and mass transfer numerical simulation has been widely used to optimize the cooling tower design and to improve the thermal efficiency, but in published papers, a few important problems is not attracted attention, such as how does impact grid density to the calculation results; how does impact change of atmospheric density to the calculation results; drop diameter is an important parameter in numerical simulation, but it is not a exact experimental data, it is important to discuss how does impact drop size to the calculation results. This paper will explore and analyze these issues in the numerical simulation.

Numerical Calculation of the Ice Grow and Empirical Calculation Results

2013 ◽  
Vol 834-836 ◽  
pp. 1448-1454 ◽  
Author(s):  
Dmitry Sharapov ◽  
Karl Shkhinek
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Stefan Problem ◽  
Ice Thickness ◽  
Field Observations ◽  
Ice Load ◽  
Element Simulation ◽  
Calculation Results ◽  
Ice Loads ◽  
Level Calculation

Ice loads is one of the most important parameters which should be taken into consideration for arctic structures. Ice load highly depends on the ice thickness. It is always recommended to consider the ice thickness data from field observations. However if data is not available it is necessary to calculate the thicknesses of ice level. Calculation is also important for the areas where the thermal fluxes through structure should be taken into the consideration. In this work numerical simulation of Stefan problem for determining of ice level thickness is presented. The results show good correlation between empirical, experimental data and the results from finite element simulation of Stefan problem.

Refined thermal calculation of the locomotive heat engine collector

2020 ◽  
pp. 56-58
Author(s):  
P.V. Gubarev ◽  
D.V. Glazunov ◽  
V.G. Ruban ◽  
A.S. Shapshal
Keyword(s):  
Experimental Data ◽  
Electric Motor ◽  
Heat Balance ◽  
Thermal Imaging ◽  
Heat Engine ◽  
Thermal Calculation ◽  
Calculation Results ◽  
Cooling Air ◽  
The Heat Balance ◽  
Traction Electric Motor

The thermal calculation of the locomotive traction engine collector is proposed. The equations of the heat balance of its elements are obtained taking into account the cooling air. The calculation results and experimental data of thermal imaging control are presented. Keywords: traction electric motor, collector, thermal calculation, thermal imaging control. [email protected]

scholarly journals Numerical Simulation of Intrachamber Processes in the Power Plant

2021 ◽  
Vol 11 (11) ◽  
pp. 4990
Author(s):  
Boris Benderskiy ◽  
Peter Frankovský ◽  
Alena Chernova
Keyword(s):  
Numerical Simulation ◽  
Power Plant ◽  
Flow Structure ◽  
Power Plants ◽  
Control Volume ◽  
Conjugate Problem ◽  
Topological Features ◽  
Gas Dynamic ◽  
Calculation Results ◽  
Volume Method

This paper considers the issues of numerical modeling of nonstationary spatial gas dynamics in the pre-nozzle volume of the combustion chamber of a power plant with a cylindrical slot channel at the power plant of the mass supply surface. The numerical simulation for spatial objects is based on the solution conjugate problem of heat exchange by the control volume method in the open integrated platform for numerical simulation of continuum mechanics problems (openFoam). The calculation results for gas-dynamic and thermal processes in the power plant with a four-nozzle cover are presented. The analysis of gas-dynamic parameters and thermal flows near the nozzle cover, depending on the canal geometry, is given. The topological features of the flow structure and thermophysical parameters near the nozzle cap were studied. For the first time, the transformation of topological features of the flow structure in the pre-nozzle volume at changes in the mass channel’s geometry is revealed, described, and analyzed. The dependence of the Nusselt number in the central point of stagnation on the time of the power plants operation is revealed.

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