Research of Heat Exchange and Losses of Kinetic Energy in the Working Blades with a Large Relative Step

2009 ◽  
Vol 40 (2) ◽  
pp. 179-186
Author(s):  
V. A. Rassokhin ◽  
S. Yu. Olennikov ◽  
E. A. Chirkova ◽  
A. A. Kondratiev ◽  
Yu. V. Matveev
Keyword(s):  
Heat Exchange ◽  
Kinetic Energy ◽  
Working Blades

scholarly journals The method of thermal calculation of automotive disc brake assemblies

2020 ◽  
Vol 17 (4) ◽  
pp. 203-208
Author(s):  
N. V. Holshev ◽  
◽  
A. A. Lavrenchenko ◽  
A. V. Prokhorov ◽  
D. N. Konovalov ◽  
...  
Keyword(s):  
Heat Exchange ◽  
Kinetic Energy ◽  
Heating Temperature ◽  
Disk Surface ◽  
Thermal Calculation ◽  
Brake Disc ◽  
Disc Brake ◽  
Electric Currents ◽  
Brake Pads ◽  
Finite Set

The article describes a method for calculating the heating temperature of the automobile brake disc. The brake disc is considered as a finite set of "cells" located in several layers. In thermal calculation, according to the proposed method, the heating of the disk surface is taken into account not only from the absorption of the vehicle kinetic energy, but also from the generated electric currents that cause micro-explosions between the irregularities of the disk surface and the brake pads. The cooling of the disk during the time between braking due to heat exchange with air is also taken into account. This method provides the ability to calculate the temperature of the brake disc, both on its surface and inside.

scholarly journals Uniformity of working processes of jet and vortex ejectors, vortex tube and Hartmann–Sprenger pipe

2021 ◽  
Vol 5 (4) ◽  
pp. 83-88
Author(s):  
V. I. Kuznetsov ◽  
◽  
V. V. Makarov ◽  
Keyword(s):  
High Pressure ◽  
Heat Exchange ◽  
Kinetic Energy ◽  
Vortex Tube ◽  
Low Pressure ◽  
Tangential Stresses ◽  
Angular Velocities ◽  
Thermodynamic Temperatures ◽  
The Difference ◽  
Physical And Mathematical Models

Based on the previously considered physical and mathematical models of jet and vortex ejectors, vortex tube and Hartmann–Sprenger tube, it makes a conclusion about the identity of the processes of exchange of work and heat in these devices. The influence of viscosity, tangential stresses, and the gradient of linear and angular velocities on the transfer of kinetic energy from a high-pressure to a low-pressure gas is shown. The difference of thermodynamic temperatures for heat exchange of high-pressure and low-pressure gases is taken into account.

Orthogonal Turbine for Free Rivers and Channels

2019 ◽  
pp. 12-23
Author(s):  
V. M. Lyatkher
Keyword(s):  
Kinetic Energy ◽  
Cross Section ◽  
High Speed ◽  
Turbine Blades ◽  
Design Modification ◽  
Blade System ◽  
Central Shaft ◽  
Working Blades ◽  
Turbine Design ◽  
Shaped Cross Section

The paper discusses the problem of using the energy of rivers without creating the dams and flooding vast areas and notes that there is a progress in the implementation and development of the ideas of patent in 1931 (the speed of the workers turbine blades is higher than flow rate). The paper gives the diagrams of the new turbines of this type, for example a balanced 6-tier single-blade turbine, turbine-spiral, a balanced twoblades turbine. Moreover, the paper deals with the features free-threaded orthogonal turbines in the streams of the limited width and depth. The most important characteristic of a turbine is the turbine's power factor that is equal to the ratio of the energy of the rotating turbine to the kinetic energy of the flow in the current tube passing through the turbine circuit. There is a possibility of a significant increase in the power of the turbine in comparison with the conditions of use unlimited streams. The increase in turbine power in a straitened flow is associated with an increase in the flow velocity in the turbine on the approach to the rear section of the blades’ track. It is set the requirements of the turbine parameters for maximum power at a given water flow and the permissible level rise in the river. These requirements relate to the certain rules for selecting the number of blades (and solidity) of the turbine, taking into account the permissible increasing in the water level (backup) in front of the turbine. The paper notes the turbines instability at low speed of rotation, describes a turbine design modification that eliminates this drawback. Modification of the high-speed orthogonal turbines is the use of accelerating blades with a cup-shaped cross-section, placed on the route within a diameter 2 times smaller than the diameter of the main (working) blades of the smoothly streamlined profile. It is concluded that all considered variants of turbines for streams with limited cross-section, the design of the blade system may be made rigid, which eliminates the single central shaft (axle), replacing it with a reference semi-shafts.

Dependence of the joint configuration on the dynamic immobility fulcrum

2019 ◽  
pp. 108-114
Author(s):  
A. D. Kozlov ◽  
Yu. P. Potekhina
Keyword(s):  
Kinetic Energy ◽  
Convex Surface ◽  
The Other ◽  
Concave Surface ◽  
Joint Configuration ◽  
Articular Surfaces

Although joints with synovial cavities and articular surfaces are very variable, they all have one common peculiarity. In most cases, one of the articular surfaces is concave, whereas the other one is convex. During the formation of a joint, the epiphysis, which has less kinetic energy during the movements in the joint, forms a convex surface, whereas large kinetic energy forms the epiphysis with a concave surface. Basing on this concept, the analysis of the structure of the joints, allows to determine forces involved into their formation, and to identify the general patterns of the formation of the skeleton.

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