Simulation Of Gas-dynamic Processes Research Articles

Взаимосвязь окружной скорости и потерь энергии в проточной части центростремительной турбины с частичным облопачиванием рабочего колеса

Low-consumption turbomachines are devices that play an important role in the drive of various units in the field of shipbuilding, aircraft engineering and other branches of heavy engineering. They have some advantages over a high-average power turbine. The largest number of low-consumption turbomachines are made partial, i.e. with partial intake. The principle of a turbine with partial flapping of the impeller is considered as one of the types of partial turbomachines. The influence of the main velocity characteristic of the turbine stage on the loss of kinetic energy in the stage is investigated. The simulation of gas dynamic processes occurring in the turbine stage was carried out using the ANSYS Workbench software package. With the help of this complex, a three-dimensional geometric model of the turbine stage with varying degrees of impeller damping was created. By applying the finite element method, a computational grid, a computational model are generated, and boundary conditions of a numerical experiment are set. The result of the numerical experiment is graphs of the dependence of kinetic energy loss on the circumferential velocity (speed characteristics of the turbine stage). This dependence can be represented not only graphically, but also with the help of mathematical apparatus. An example of such an apparatus is the polynomial dependence. The considered mathematical design can be used in order to optimize mathematical models of gas flow in the flow part of a low-flow turbine. Cubic two-parameter polynomials of kinetic energy losses in the flow part of the nozzle and impeller are obtained, and an assessment of its applicability in the current mathematical model is given.

Numerical Simulation of Gas Dynamic Processes in a RFI-11/60 RF Plasmotron

Numerical Simulation of Gas Dynamic Processes in a RFI-11/60 RF Plasmotron

Studying the «SPH» Method Applicability to the 2D Simulation of Gas Dynamic Processes with Detonation

Studying the «SPH» Method Applicability to the 2D Simulation of Gas Dynamic Processes with Detonation

Numerical Three-Dimensional Simulation of Gas Dynamic Processes in the Stage of a Small-Sized Ultra-Low Power Axial Turbine

The problems of creation and calculation of virtual numerical models in the stage of an ultra-low power axial turbine are considered. A method for constructing the calculation area of the flow in an axial turbine and a finite element grid superimposed on this area is given. The characteristics of the power efficiency and specific power of the turbine are obtained depending on the pressure ratio and the loading parameter. The results of the numerical experiment are verified with the data of the full scale experiment.

Численное моделирование газодинамических процессов в тракте газодинамической трубы

Численное моделирование газодинамических процессов в тракте газодинамической трубы

Numeric Simulation of Gas-Dynamic Processes in the Swirl Combustion Chamber in STAR-CCM+

The paper examines the theoretical and practical aspects of modeling of gas-dynamic processes in the swirl chamber. The results of numerical computation of a swirling gas flow induced by two-row header in cylindrical chamber are presented. The description of two-phase flow model subject to the injection of particles is given. It is revealed that in stationary mode two characteristic zones are formed: axial zone of quasi-solid rotation and cylinder surface zone.

Numerical simulation of gasdynamic processes and the dynamics of dust particles in catastrophic volcanic explosions by applying TVD schemes

We developed a physicomathematical model to predict volcanic explosion-induced gasdynamic phenomena and the dynamics of the distribution of particles of ash and dust that precipitate onto the earth’s surface and that remain in the atmotsphere. We investigated the factors and processes that exert an influence on the transport of dust particles in the atmosphere. On the basis of the physicomathematical model developed, numerical simulation of volcanic explosions of specified power and space scale is done, and results on the dynamics of gasdynamic flows of air and the distribution of dust particles for different instants of time are analyzed.

Numerical simulation of gas-dynamic processes in a pipe open at one end

The problem of sudden opening of one end of a circular pipe containing a pressurized gas is considered. A new form of the boundary condition at the open end of the pipe is proposed that takes into account the local hydrodynamic drag due to the nonlinearity of the real physical problem. The system of gas-dynamic equations is integrated by the Godunov numerical method of discontinuity decay. The procedure of numerical realization of the nonlinear boundary condition at the open end of the pipe is described in detail. Comparison of the graphs obtained in the calculations with experimental data indicates that the proposed technique is appropriate.

Numerical simulation of gasdynamic processes in the case of catastrophic volcanic eruptions

Numerical simulation of the flow of air originating as a result of volcanic eruption is carried out with the parameters corresponding to those figuring in the eruption of the Krakatau volcano in 1883 (with an energy of 100–1000 Mton of TNT equivalent). The results of the calculation are compared with the consequences of the disaster known from the literature.

An approach to numerical modeling of the dynamics of reacting gases in nozzles

An approach is proposed to computer simulation of gas-dynamic processes in chemically nonequilibrium flows in supersonic nozzles. An algorithm for the solution of the problem is developed. Convergence of iterative processes and stability of the linearized problem are investigated.

Numerical simulation of gas-dynamic processes in shells of neutron stars with allowance for anomalies in the equation of state

system (2) was integrated numerically for the initial and boundary conditions p(O,t)=%, [~(Q,t)=O, t>O, p(q,O)=p(q), u(q,t)=u(q), O<q<O.

Numerical simulation of gasdynamic processes occurring with the action of laser radiation with moderate flux density on a metallic barrier in air

Numerical simulation of gasdynamic processes occurring with the action of laser radiation with moderate flux density on a metallic barrier in air