Reducing the drag of midpoint lateral orifices of exhaust air ducts by shaping them along vortex zone outlines

2021 ◽  
Vol 188 ◽  
pp. 107491
Author(s):  
Arslan Ziganshin ◽  
Konstantin Logachev ◽  
Kamilla Batrova
Keyword(s):  
Vortex Zone

Study on the continuous precipitation of U(IV) oxalate in a vortex precipitator

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Chuanbo Li ◽  
Yongzhi Ning ◽  
Taihong Yan ◽  
Weifang Zheng
Keyword(s):  
Oxalic Acid ◽  
Residence Time ◽  
Nitrate Solution ◽  
The Other ◽  
Nucleation Process ◽  
Average Residence Time ◽  
Continuous Precipitation ◽  
Vortex Zone ◽  
Forced Vortex ◽  
Particles Size Distribution

Abstract The effects of feeding location, stirring speed and apparent average residence time on oxalate crystals size and distribution, tackiness of the product on the walls of reactor and stirring paddle were investigated in a vortex continuous precipitator at 45 °C. The results showed agglomeration happened during nucleation and crystals growth of U(IV) oxalate. Both local supersaturations and agglomeration maked the particles size distribution of U(IV) oxalate from 10–100 µm and the average sizes 35–45 µm. On the other hand, when the nucleation process were controlled to happen in the forced vortex zone, two feeding locations: (a) both oxalic acid and U(IV) nitrate solution into the forced vortex zone, (b) oxalic acid into the free vortex and U(IV) nitrate solution into the forced vortex, tackiness of the crystals on the wall of the precipitator could be effectively avoided.

Comparative Analysis of Flow Field in Mixed and Non Mixed Gas Electrochemical Machining for Aero-Engine Turbine Blade Cooling Holes

2017 ◽  
Vol 868 ◽  
pp. 166-171
Author(s):  
Zhing Yong Li ◽  
Xiu Ting Wei ◽  
Wen Wen Lu ◽  
Qing Wei Cui
Keyword(s):  
Flow Field ◽  
Flow Velocity ◽  
Turbine Blade ◽  
Electrochemical Machining ◽  
Machining Accuracy ◽  
Mixed Gas ◽  
Turbine Blade Cooling ◽  
Blade Cooling ◽  
Vortex Zone ◽  
Aero Engine

By the cooling holes in aero-engine turbine blade as the research object, this study focuses on two kinds of ECM methods, which are mix gas added to the nonlinear electrolyte (NaNO3) and non-mixed gas. Mixed and non-mixed gas ECM experiments of turbine blade cooling holes were carried out respectively. The corresponding two-dimensional CAD model of cooling hole was constructed combined with the experimental data and theoretical analysis. Numerical simulation analysis was carried out of the flow field base on the above models by using the fluid dynamics analysis software FLUENT. The influence flow velocity and flow velocity distribution on the machining accuracy and efficiency of ECM were investigated in detail. The vortex zone distribution of gas-NaNO3 mixed phase flow field and single NaNO3 solution flow field was analyzed qualitatively. The simulation results indicated that the flow velocity in the machining gap with mixed gas was significantly higher than the velocity during ECM process for cooling holes. The electrolytic products and heat were washed away completely, the electrolyte can be updated in time. Fluid vortex zone distribution was improved obviously, the flow field distribution became more uniform after mixed gas in ECM process. The machining accuracy and efficiency for cooling holes making may be improved greatly with gas mixed in electrolyte NaNO3.

scholarly journals Структура потока в межлопаточном канале соплового аппарата с поворотной диафрагмой

2021 ◽  
pp. 35-43
Author(s):  
Александр Григорьевич Жирков ◽  
Александр Павлович Усатый ◽  
Елена Петровна Авдеева ◽  
Юрий Иванович Торба
Keyword(s):  
Pressure Drop ◽  
Kinetic Energy ◽  
Energy Loss ◽  
Numerical Study ◽  
Working Fluid ◽  
Relative Pressure ◽  
Pressure Drops ◽  
Vortex Zone ◽  
Flat Flow ◽  
Tube Channel

In the process of developing a numerical study method of a flat flow around a snap line with a rotary diaphragm, calculations were made at various degrees of opening the rotary diaphragm δ and pressure drops on the grille. As a result of calculations, for small degrees, the opening of the rotary diaphragm, complex patterns of the flow were obtained, in the inter-tube channel of the nozzle apparatus. The article presents some results of a numerical study of the supersonic flow in the channel of the nozzle apparatus with the degree of opening the rotary diaphragm δ = (0.15 ÷ 0.3). Modeling and calculating the flow of the working fluid is made using the Fluent software package. The construction of the calculated areas bounded by one inter-tube channel, for varying degrees of opening the diaphragm of the nozzle apparatus. Grids are built for calculated areas. Calculations were carried out for δ = (0.15 ÷ 0.3) and with different degrees of pressure drop on the grille. As a result of the calculations performed, the flow patterns in the inter-tube canal were obtained and behind it, and the distribution of the coefficients of the kinetic energy loss on the lattice front at various degrees of the discovery of the diaphragm at the inlet in the nozzle apparatus. According to the results of the work carried out, the following conclusions can be drawn: the structure of the stream in the inter-tube channel, the nozzle apparatus at small detection of the discovery, is divided into two parts: a supersonic core of the spawth of the blade and a dialing, the vortex zone at the back of the blade; The supersonic thread kernel at certain values of the relative pressure drop on the lattice (or the air flow values through the grid) is separated by shock fronts into several areas; The coefficients of energy loss, for small degrees of discovery, decrease with a decrease in the relative pressure drops (with an increase in the rate of expiration of the flow from the nozzle lattice); The greatest contribution to the magnitude of the loss of kinetic energy is introduced by a vortex zone in the inter-tube channel, and not wave phenomena in the core of the flow; Optimization of the flow part of the nozzle apparatus must be carried out in order to reduce areas with vortex flow. The results obtained in this work will be used to develop a methodology for a numerical study of the spatial flow around the nozzle lattices with rotary diaphragms.

Technology of Recovery of Liquid Waste Generated During the Preparation of Main Pipeline for the Transportation of Diesel Fuel

2019 ◽  
Vol 23 (8) ◽  
pp. 4-7
Author(s):  
G.I. Pavlov ◽  
P.V. Nakorjakov ◽  
O.R. Sitnikov ◽  
A.I. Akhmetshina
Keyword(s):  
Vapor Phase ◽  
Diesel Fuel ◽  
Vortex Flow ◽  
Liquid Fraction ◽  
Liquid Waste ◽  
Nozzle Diameter ◽  
Main Pipeline ◽  
Flammable Liquid ◽  
Fine Purification ◽  
Vortex Zone

This article describes a method of burning fuel without spraying through the nozzle due to the conversion of the liquid fraction in the vapor phase in vortex flow. When this occurs the flammable liquid in the vortex zone is carried out not through a calibrated orifice (nozzle), and the tube having a diameter of several tens of times larger than the nozzle diameter. This principle is equally effective can be burned as fuel commodity and pitched liquid combustible waste without fine purification.

On the Motion of Particles in the Vortex Zone of a Cyclone–Grate-Fired Chamber

2019 ◽  
Vol 92 (2) ◽  
pp. 432-440
Author(s):  
E. A. Pitsukha ◽  
Yu. S. Teplitskii ◽  
A. R. Roslik
Keyword(s):  
Vortex Zone

Characteristics of a magnetic fluid heat transport device Part 1: Numerical simulation of flow and heat transport phenomena

2000 ◽  
Vol 214 (4) ◽  
pp. 549-561 ◽  
Author(s):  
H Yamaguchi ◽  
I Kobori ◽  
N Kobayashi
Keyword(s):  
Magnetic Field ◽  
Numerical Analysis ◽  
Heat Transport ◽  
Magnetic Fluid ◽  
Numerical Study ◽  
Thermal Characteristics ◽  
Geometrical Model ◽  
Flow State ◽  
Vortex Zone ◽  
Transport Device

A numerical analysis is conducted in order to study the flow state and thermal characteristics of a magnetic fluid heat transport device. A simple geometrical model of the device is considered in the present numerical study. The highly simplified marker-and-cell (HSMAC) method is adopted for the numerical analysis, where the transient solutions are obtained in the two-dimensional axisymmetric computational plane. From results of the numerical calculation it can be shown that the vortex zone appears when a magnetic field is applied and the configuration of flow associated with the vortex zone changes for variation in the magnetic field, increasing or decreasing the heat transport capability dependent upon the conditions of the device.

The effect of cracks on the superconducting transport current in thin films: The analogy with two-dimensional elasticity and plasticity

1993 ◽  
Vol 8 (7) ◽  
pp. 1515-1532 ◽  
Author(s):  
David R. Clarke ◽  
Marc DeGraef
Keyword(s):  
Crack Tip ◽  
Nucleation Site ◽  
Two Dimensions ◽  
Homogeneous Material ◽  
Pinning Force ◽  
Dislocation Emission ◽  
Applied Current ◽  
Vortex Zone ◽  
Dislocation Models ◽  
Superconducting Vortices

Simulations of arrays of resistively shunted Josephson junctions containing a crack of uncoupled junctions indicate that the crack can distort the supercurrent flow and provide a nucleation site at the crack tip for the formation of superconducting vortices at applied currents below the critical current of the homogeneous material. An analogy is established between the supercurrent distribution in two dimensions and the stress field distribution around the crack for antiplane mechanical loading. The analogy is used to show that the supercurrent distribution can be described analytically in terms of a Westergaard function used in elasticity theory. In addition, using a correspondence between the forces acting on a vortex and a crystal dislocation, models for screw dislocation emission from a crack tip are transposed to describe vortex emission from a crack tip. These lead to predictions for the pinning force required to prevent dissipation by vortex emission from the crack tip, as well as for the size of a vortex zone ahead of the crack for different values of the ratio of the applied current to the pinning force.

scholarly journals Interfacial Microstructure of FeCoNiCrAl0.1 High Entropy Alloy and Pure Copper Prepared by Explosive Welding

Coatings ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1197
Author(s):  
Qichao Tian ◽  
Hanliang Liang ◽  
Yang Zhao ◽  
Honghao Ma ◽  
Zhaowu Shen ◽  
...  
Keyword(s):  
Explosive Welding ◽  
Pure Copper ◽  
Composite Plates ◽  
Interfacial Microstructure ◽  
Grain Structure ◽  
High Entropy Alloy ◽  
Elemental Distribution ◽  
Electron Backscattered Diffraction ◽  
High Entropy ◽  
Vortex Zone

The FeCoNiCrAl0.1 high entropy alloys (HEAs) and pure copper (Cu) composite plates were successfully fabricated by the explosive welding technique using two different gap distances. The interfacial microstructure, elemental distribution, grain structure of vortex zone and hardness were characterized using optical microscopy (OM), scanning electron microscopy (SEM), electron backscattered diffraction (EBSD), nanoindentation and micro-hardness tester. The explosive weldability window was calculated to verify the weldability of HEAs and Cu. The results indicated that the Cu/HEA composites presented typical wavy structures without visible defects and have an excellent bonding quality. The elements mixed and formed intermetallic compounds at the vortex zones. The grains near the vortex zones showed strong deformation, and phase transformation occurred. Compared with the matrix metals, the hardness of Cu and HEAs increased near the welding interface and sharply increased to 375 HV near the vortex zone.

Flow characteristics and micro—bubble behaviour in a rotating pipe section with an abrupt enlargement

2001 ◽  
Vol 215 (12) ◽  
pp. 1447-1457 ◽  
Author(s):  
H Yamaguchi ◽  
D Matsubara ◽  
S Shuchi
Keyword(s):  
Stagnation Point ◽  
Dynamic Behaviour ◽  
Swirling Flow ◽  
Flow Characteristics ◽  
Reattachment Point ◽  
Vortex Zone ◽  
Air Pocket ◽  
Pipe Section ◽  
Micro Bubble ◽  
Pipe Rotation

The flow characteristics and dynamic behaviour of micro-bubbles were investigated experimentally and numerically for swirling flow within rotating pipe sections. In the present investigation, three types of rotating pipe section were used in order to study the effects of geometric configuration upon the flowfield. Experimental data were obtained for locations of the stagnation point and profiles of the parabolic surface. The results obtained from experiments were examined and verified with the aid of numerical analysis. It was found that the air pocket formed at the stagnation point was moved upstream by the effect of the suddenly expanded part when pipe rotation was increased. The reattachment point did not shift downstream as a result of an increase in the Reynolds number. This is due to the fact that the vortex zone at the expanded corner expands or shrinks, depending on the speed of rotation.

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