scholarly journals Структура течения и колебания давления при взаимодействии сверхзвуковой недорасширенной струи газа с трубной полостью

2020 ◽  
Vol 90 (8) ◽  
pp. 1254
Author(s):  
К.Н. Волков ◽  
В.Н. Емельянов ◽  
А.В. Ефремов ◽  
А.И. Цветков
Keyword(s):  
Flow Field ◽  
Gas Flow ◽  
Piezoelectric Sensors ◽  
Gas Jet ◽  
Pressure Oscillations ◽  
Underexpanded Jet ◽  
Longitudinal Modes ◽  
Flow Parameters ◽  
Supersonic Underexpanded Jet ◽  
Physical Pattern

Supersonic jets are widely used in devices based on the phenomenon of a self-oscillating process that occurs when a gas flow interacts with circular cavities (gas-jet sound emitters). The mechanisms of maintaining undamped pressure oscillations and determining the flow field in the tube cavity during the interaction of a supersonic underexpanded jet with cavity are considered. The physical pattern of the flow in the cavity of a gas-jet emitter is discussed, the existence of odd longitudinal modes is shown, and wave diagrams are proposed for describing the flow in odd longitudinal modes. The wave diagrams are based on the analysis of the signals of piezoelectric sensors, recording pressure oscillations in the tube cavity. The calculation of the flow parameters in the tube cavity in longitudinal modes is based on the flow velocity and speed of sound diagram.

On the Impingement of Supersonic Jet on a Normal Flat Surface

1982 ◽  
Vol 33 (3) ◽  
pp. 199-218 ◽  
Author(s):  
B.N. Pamadi
Keyword(s):  
Flat Surface ◽  
Supersonic Jet ◽  
Improved Method ◽  
Normal Surface ◽  
Underexpanded Jet ◽  
Flow Parameters ◽  
Supersonic Underexpanded Jet ◽  
Method Of Integral Relations ◽  
Integral Relations ◽  
Good Agreement

SummaryAn improved method, based on one strip approximation of the method of integral relations which was reported originally by Belov, Ginzburg and Shub, is presented for the calculation of flow parameters in the impingement region of a supersonic, underexpanded jet striking a normal surface located within the first cell. The results are presented for two impingement conditions and found to be in good agreement with the experimental data.

Simulation and Analysis for the Rocket Gas Flow Field Based on Mechanical Mechanics and Mechanical Properties

2013 ◽  
Vol 345 ◽  
pp. 455-458
Author(s):  
Yang Zhang ◽  
Yi Jiang ◽  
Xiao Tong Dong
Keyword(s):  
Mechanical Properties ◽  
Flow Field ◽  
Stream Flow ◽  
Gas Flow ◽  
Gas Jet ◽  
Absolute Pressure ◽  
Danger Zone ◽  
Transmission Process ◽  
Process Gas ◽  
Analog Transmission

Gas jet of the rocket on the launch environment has serious gas shock effects, bursts of rocket impact will be greater and greater harm. This article take the numerical methods for simulation, analog transmission process gas stream flow, and finally calculate the pressure and temperature of the emitting device impingement flow field and the maximum absolute pressure and temperature, and ultimately determine gas impact of the danger zone of the flow field.

Modeling of pressure losses on friction in three-layer laminar flows

2003 ◽  
Vol 3 ◽  
pp. 208-219
Author(s):  
A.M. Ilyasov
Keyword(s):  
Pressure Loss ◽  
Gas Flow ◽  
Mutual Influence ◽  
Fluid Model ◽  
Immiscible Liquid ◽  
Laminar Flows ◽  
Pressure Losses ◽  
Flow Parameters ◽  
Interphase Boundaries ◽  
Closing Relations

In this paper we propose a model for determining the pressure loss due to friction in each phase in a three-layer laminar steady flow of immiscible liquid and gas flow in a flat channel. This model generalizes an analogous problem for a two-layer laminar flow, proposed earlier. The relations obtained in the final form for the pressure loss due to friction in liquids can be used as closing relations for the three-fluid model. These equations take into account the influence of interphase boundaries and are an alternative to the approach used in foreign literature. In this approach, the wall and interphase voltages are approximated by the formulas for a single-phase flow and do not take into account the mutual influence of liquids on the loss of pressure on friction in phases. The distribution of flow parameters in these two models is compared.

Numerical Analysis of Flow Fields and Temperature Fields in a Regenerative Heating Furnace for Steel Pipes

2018 ◽  
Vol 10 (3) ◽  
Author(s):  
Yi Han ◽  
Feng Liu ◽  
Xin Ran
Keyword(s):  
Temperature Field ◽  
Flow Field ◽  
Flow Velocity ◽  
Gas Flow ◽  
Flow Fields ◽  
Heating Furnace ◽  
Temperature Fields ◽  
Turbulent Layer ◽  
Steel Pipes ◽  
Pipe Blanks

In the production process of large-diameter seamless steel pipes, the blank heating quality before roll piercing has an important effect on whether subsequently conforming piping is produced. Obtaining accurate pipe blank heating temperature fields is the basis for establishing and optimizing a seamless pipe heating schedule. In this paper, the thermal process in a regenerative heating furnace was studied using fluent software, and the distribution laws of the flow field in the furnace and of the temperature field around the pipe blanks were obtained and verified experimentally. The heating furnace for pipe blanks was analyzed from multiple perspectives, including overall flow field, flow fields at different cross sections, and overall temperature field. It was found that the changeover process of the regenerative heating furnace caused the temperature in the upper part of the furnace to fluctuate. Under the pipe blanks, the gas flow was relatively thin, and the flow velocity was relatively low, facilitating the formation of a viscous turbulent layer and thereby inhibiting heat exchange around the pipe blanks. The mutual interference between the gas flow from burners and the return gas from the furnace tail flue led to different flow velocity directions at different positions, and such interference was relatively evident in the middle part of the furnace. A temperature “layering” phenomenon occurred between the upper and lower parts of the pipe blanks. The study in this paper has some significant usefulness for in-depth exploration of the characteristics of regenerative heating furnaces for steel pipes.

Modeling of Flow Fields of Different Delivery Chamfers in Spray Forming Process

2014 ◽  
Vol 789 ◽  
pp. 554-559
Author(s):  
Yang Liu ◽  
Zhou Li ◽  
Guo Qing Zhang ◽  
Wen Yong Xu
Keyword(s):  
Flow Field ◽  
Gas Flow ◽  
Fluid Dynamic ◽  
Metal Flow ◽  
Spray Forming ◽  
Operating Pressure ◽  
Delivery Tube ◽  
Forming Process ◽  
Atomization Process ◽  
Sharp Point

The computational fluid dynamic (CFD) software was used to calculate the velocity field in atomization chamber of spray forming equipment. The relationship between melt flow rates, gas aspiration of the atomizer and operating pressure are complex, and the above mentioned parameters are closely related to the atomization process. The influences of different delivery chamfers on gas flow field, which is determined by atomizer structure, were analyzed. Using K-epsilon model with a symmetrical domain, the gas dynamic of different delivery chamfer conditions were investigated. The results indicate that the sharp point of delivery tube causes detachment of flow field, and 56°, 45° and 34° chamfer conditions have same diffusion angle. Gas was aspirated from delivery tube when chamfer was 0°, which is beneficial to liquid metal flow in atomization process.

Simulation of Flow Field of Oxygen Lance Gas Jet Utilized for 50 t Converter

2011 ◽  
Vol 18 (4) ◽  
pp. 11-18 ◽  
Author(s):  
Jun-guo Li ◽  
Ya-nan Zeng ◽  
Jian-qiang Wang ◽  
Zhi-jie Han
Keyword(s):  
Flow Field ◽  
Gas Jet ◽  
Oxygen Lance
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