scholarly journals Recoil Reduction Method of Gun with Side to Rear Jet Controlled by Piston Motion

Symmetry ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 396
Author(s):  
Ming Qiu ◽  
Peng Si ◽  
Jie Song ◽  
Zhenqiang Liao
Keyword(s):  
Flow Model ◽  
Reduction Method ◽  
Structural Parameters ◽  
Firing Cycle ◽  
Piston Motion ◽  
Recoil Momentum ◽  
Two Phase ◽  
One Dimensional ◽  
Firing Mode ◽  
Gun Firing

Excessive recoil severely restricts the loading of high-power traditional guns on modern vehicles. To reduce the recoil without breaking the continuous firing mode and reducing the projectile velocity, a recoil reduction method that controls the lateral ejecting of propellant gas by a piston was proposed. The recoil reduction device is symmetric about the barrel axis. First, a one-dimensional two-phase flow model of interior ballistic during the gun firing cycle was established. Next, the MacCormack scheme was used to simulate, and the piston motion was gained. Then the propagation of the rarefaction wave in the barrel was presented. Finally, the propulsion difference between the piston-controlled gun and the traditional gun was discussed. The results showed that the recoil momentum was reduced by 31.80%, and the muzzle velocity was decreased by just 1.30% under the reasonable matching of structural parameters.

A ONE-DIMENSIONAL TWO-PHASE FLOW MODEL AND EXPERIMENTAL VALIDATION FOR A FLASHING VISCOUS LIQUID IN A SPLASH PLATE NOZZLE

2015 ◽  
Vol 25 (9) ◽  
pp. 795-817 ◽  
Author(s):  
Mika P. Jarvinen ◽  
A. E. P. Kankkunen ◽  
R. Virtanen ◽  
P. H. Miikkulainen ◽  
V. P. Heikkila
Keyword(s):  
Viscous Liquid ◽  
Experimental Validation ◽  
Flow Model ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
One Dimensional

scholarly journals Modelling sedimentation–consolidation in the framework of a one-dimensional two-phase flow model

2013 ◽  
Vol 51 (3) ◽  
pp. 293-305 ◽  
Author(s):  
Julien Chauchat ◽  
Sylvain Guillou ◽  
Damien Pham Van Bang ◽  
Kim Dan Nguyen
Keyword(s):  
Flow Model ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
One Dimensional

Modeling of Wall Friction for Multispecies Solid-Gas Flows

1986 ◽  
Vol 108 (4) ◽  
pp. 486-488 ◽  
Author(s):  
E. D. Doss ◽  
M. G. Srinivasan
Keyword(s):  
Shear Stress ◽  
Flow Model ◽  
Flow Characteristics ◽  
Wall Friction ◽  
Gas Flows ◽  
Two Phase ◽  
One Dimensional ◽  
Friction Models ◽  
Wall Interaction ◽  
The One

The empirical expressions for the equivalent friction factor to simulate the effect of particle-wall interaction with a single solid species have been extended to model the wall shear stress for multispecies solid-gas flows. Expressions representing the equivalent shear stress for solid-gas flows obtained from these wall friction models are included in the one-dimensional two-phase flow model and it can be used to study the effect of particle-wall interaction on the flow characteristics.

Verification of a One-Dimensional Two-Phase Flow Model of the Frontal Gap in Electrochemical Machining

1976 ◽  
Vol 98 (2) ◽  
pp. 431-437 ◽  
Author(s):  
F. Fluerenbrock ◽  
R. D. Zerkle ◽  
J. F. Thorpe
Keyword(s):  
Flow Model ◽  
Radial Flow ◽  
Electrochemical Machining ◽  
Equilibrium Conditions ◽  
Two Phase ◽  
One Dimensional ◽  
Supply Pressure ◽  
Theoretical Predictions ◽  
The One ◽  
Experimental Pressure

A set of six equations, which are based on the ECM model developed by Thorpe and Zerkle, can be solved numerically to yield the one-dimensional distributions of pressure, temperature, gas density, gap thickness, void fraction, and electrolyte velocity in the rectilinear ECM frontal gap under equilibrium conditions. The validity of the model, which also applies to radial flow geometries, is confirmed by comparing experimental pressure and gap profiles with theoretical predictions. It is shown that for a given set of operating parameters there is a minimum supply pressure below which no machining is possible. When machining steel with an aqueous NaCl electrolyte the deposition of a black smut (Fe(OH)2) occurs beyond a certain smut-free entrance length, which was experimentally found to be proportional to the inlet gap thickness.

scholarly journals Application of a Eulerian two-phase flow model to scour processes

2018 ◽  
Vol 40 ◽  
pp. 05015 ◽  
Author(s):  
Antoine Mathieu ◽  
Tim Nagel ◽  
Cyrille Bonamy ◽  
Julien Chauchat ◽  
Zhen Cheng ◽  
...  
Keyword(s):  
Experimental Data ◽  
Vortex Shedding ◽  
Flow Model ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Submarine Pipeline ◽  
Sheet Flow ◽  
Two Phase ◽  
One Dimensional ◽  
Quantitative Results

In this paper, the application of a two-phase flow model to scour processes is presented. The model is first calibrated against experimental data of unidirectional sheet-flow (one-dimensional configuration). The model is then applied to multi-dimensional configurations for the scour under a submarine pipeline and around a vertical pile. The results show that quantitative results can be obtained at the upstream sides of structures, the lee-wake erosion driven by the vortex shedding deserves further research.

Research on Two Phase Waterjet Nozzles

2010 ◽  
Vol 132 (12) ◽  
Author(s):  
S. Gowing ◽  
T. Mori ◽  
S. Neely
Keyword(s):  
Flow Model ◽  
Bubbly Flow ◽  
Two Phase ◽  
Convergent Nozzle ◽  
One Dimensional ◽  
Void Fractions ◽  
Compressed Gas ◽  
Flow Changes ◽  
Predicted Values ◽  
Nozzle Thrust

Air-augmented waterjets derive their propulsion from compressed gas mixed directly into the main flow. The gas bubbles expand as the mixture passes through the pressure gradient of the convergent nozzle, and energy is imparted to the water from the air in a complex fashion. This experiment measures the exchange of air and water energy for three nozzles over a range of flowrates and void fractions using compressed air injected and mixed upstream of the nozzle entrance. Pressures and nozzle thrust are measured to examine flow changes. The results are compared with predictions from a one-dimensional bubbly flow model. The measured efficiencies are lower than or comparable to predicted values.

A one-dimensional and two-phase flow model of a proton exchange membrane fuel cell

2015 ◽  
Vol 90 (9) ◽  
pp. 1547-1551 ◽  
Author(s):  
Rui B Ferreira ◽  
Daniela S Falcão ◽  
Vânia B Oliveira ◽  
Alexandra Maria FR Pinto
Keyword(s):  
Fuel Cell ◽  
Proton Exchange Membrane ◽  
Flow Model ◽  
Two Phase Flow ◽  
Proton Exchange ◽  
Phase Flow ◽  
Two Phase ◽  
One Dimensional ◽  
Exchange Membrane

Interior Ballistic Modeling and Simulation for Different Charge Zones in Modular Charge System

2013 ◽  
Vol 80 (3) ◽  
Author(s):  
Changjun Ma ◽  
Xiaobing Zhang
Keyword(s):  
Flow Model ◽  
Ballistic Performance ◽  
Two Phase ◽  
Charge System ◽  
Flame Spreading ◽  
One Dimensional ◽  
Interior Ballistics ◽  
The Core ◽  
Lower Charge ◽  
Full Charge

The modular charge is developed to replace the conventional bagged charge systems for many advantages. In the interior ballistic cycle of a modular charge system, the nonsimultaneous ignition of propellant in different cases results in an increasing pressure wave, and can cause a launch safety problem of the gun. Because the charge structure is complicated, it is hard to simulate the interior ballistics process for the modular charge system currently. To simulate the interior ballistic of the modular charge system more accurately, an improved interior ballistic one-dimensional two phase flow model for modular charge system is established. The improvement of this model lies in that it takes account of the discontinuity of the propelling charge bed, the block of the cartridge wall to the flame spreading in propelling charge bed, effects of modular cartridge movement to the interior ballistic performance, the nonsimultaneous breakup of the modular charge cartridges, the ignition of the propelling charge in different cartridges, and flame spreading through the cap of the core tubes. Simulation for a full charge and three lower charge cases with different charge position were carried out based on the model. The simulation results proved that the model is reliable, and can be used to study the effects of cartridge mechanical properties, charge position, different charge zones on interior ballistic performance of modular charges.

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