Numerical Simulation of Heat Radiation Generated by Entering Space Vehicle

2004 ◽  
Author(s):  
Sergey Surzhikov
Keyword(s):  
Numerical Simulation ◽  
Space Vehicle ◽  
Heat Radiation

Simulation Study on the Radiant Tube Installation Height for the Gas-Infrared Heated System

2012 ◽  
Vol 614-615 ◽  
pp. 239-244
Author(s):  
Da Ying Zhang ◽  
Wei Dong Zhuang ◽  
Ke Qin Gong
Keyword(s):  
Numerical Simulation ◽  
Heat Flux ◽  
Numerical Calculation ◽  
Radiation Flux ◽  
Heat Radiation ◽  
Total Heat Flux ◽  
Tube Surface ◽  
Indoor Temperature ◽  
Radiant Tube ◽  
Average Temperature

The numerical simulation for radiant tube heat transferring process of the gas-infrared heated room was finished. By means of numerical calculation, the influences of radiant tube installation height to the indoor temperature and workspace air temperature as well as the heat radiation flux were studied. The results show: The greater of radiant tube surface installation height, The lower of the workspace average temperature, average radiation temperature and radiant tube total heat flux.

NUMERICAL SIMULATION OF AERODYNAMICS OF WINGED RE-ENTRY SPACE VEHICLE

2009 ◽  
Vol 40 (2) ◽  
pp. 131-149 ◽  
Author(s):  
A. V. Vaganov ◽  
S. M. Drozdov ◽  
A. P. Kosykh ◽  
G. G. Nersesov ◽  
I. F. Chelysheva ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Space Vehicle

scholarly journals Numerical simulation of heat dissipation of surface mounted permanent magnet synchronous hub motor

2021 ◽  
Vol 25 (6 Part A) ◽  
pp. 4059-4066
Author(s):  
Shuai Leng ◽  
Liqiang Jin
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Permanent Magnet ◽  
High Speed ◽  
Heat Dissipation ◽  
Heat Radiation ◽  
Insulation Material ◽  
Safety Hazard ◽  
Insulation Aging ◽  
Potential Safety

Due to the insulation aging, demagnetization and other problems of the permanent magnet and insulating material in the permanent magnet synchronous hub motor under high temperature, the numerical simulation of the heat dissipation of surface mounted permanent magnet synchronous hub motor is proposed. According to the heat transfer of hub motor, the effect degree of heat conduction, heat convection and heat radiation is obtained, the heat transfer coefficient of each part is calculated, and the influence of motor insulation material on temperature rise is analyzed. The experimental results show that the heat dissipation of hub motor under natural cooling condition is poor, and the internal oil cooling method can effectively improve the heat dissipation of hub motor and reduce the temperature difference. When operating at high speed, this reduces the potential safety hazard.

scholarly journals Numerical simulation of gas flow in nozzle channels with a central body

2021 ◽  
Vol 2094 (4) ◽  
pp. 042083
Author(s):  
Yu V Kaun ◽  
N A Brykov ◽  
M V Chernyshov
Keyword(s):  
Numerical Simulation ◽  
Gas Flow ◽  
Central Body ◽  
Space Vehicle ◽  
Point Of View ◽  
Injection System ◽  
Energy Losses ◽  
Main Task ◽  
Full Load ◽  
Flight Mode

Abstract The development of a reusable launch system is one of the most promising directions in the development of cosmonautics. World rocket companies are striving to create a space vehicle with improved tactical and technical characteristics. The main task is to ensure the most efficient flight mode of the reusable spacecraft from the point of view of the full load of the injection system. Since the main costs are spent on transporting the fuel of the rocket and its own design, the developers strive to fully load such a system not only when sending into orbit, but also when returning back. The implementation of the idea of a reusable spacecraft entails large energy losses, which suggests the idea of creating a single-stage reusable launch system.

scholarly journals Numerical simulation of wall temperature on gas pipeline due to radiation of natural gas during combustion

2012 ◽  
Vol 16 (suppl. 2) ◽  
pp. 567-576 ◽  
Author(s):  
Marko Ilic ◽  
Velimir Stefanovic ◽  
Gradimir Ilic ◽  
Sasa Pavlovic ◽  
Dragan Kustrimovic
Keyword(s):  
Numerical Simulation ◽  
Wall Temperature ◽  
Gas Pipeline ◽  
Chemical Effect ◽  
Heat Radiation ◽  
Rare Gas ◽  
Time Resolved ◽  
Pipe Surface ◽  
Gas Leakage ◽  
Fluent Software

This paper presents one of the possible hazardous situations during transportation of gas through the international pipeline. It describes the case when at high-pressure gas pipeline, due to mechanical or chemical effect, cracks and a gas leakage appears and the gas is somehow triggered to burn. As a consequence of heat impingement on the pipe surface, change of material properties (decreasing of strength) at high temperatures will occur. In order to avoid greater rapture a reasonable pressure relief rate needs to be applied. Standards in this particular domain of depressurizing procedure are not so exact (DIN EN ISO 23251; API 521). This paper was a part of the project to make initial contribution in defining the appropriate procedure of gas operator behaving during the rare gas leakage and burning situations on pipeline network. The main part of the work consists of two calculations. The first is the numerical simulation of heat radiation of combustible gas, which affects the pipeline, done in the FLUENT software. The second is the implementation of obtained results as a boundary condition in an additional calculation of time resolved wall temperature of the pipe under consideration this temperature depending on the incident flux as well as a number of other heat flow rates, using the Matlab. Simulations were done with the help of the ?E.ON Ruhrgas AG? in Essen.

Simulation Study on the Radiant Tube Transferring Characteristics for the Gas-Infrared Heated System

2012 ◽  
Vol 594-597 ◽  
pp. 2086-2089
Author(s):  
Da Ying Zhang ◽  
Wei Dong Zhuang ◽  
Ke Qin Gong
Keyword(s):  
Numerical Simulation ◽  
Heat Flux ◽  
Numerical Calculation ◽  
Radiation Flux ◽  
Heat Radiation ◽  
Total Heat Flux ◽  
Tube Surface ◽  
Indoor Temperature ◽  
Radiant Tube ◽  
Average Temperature

The numerical simulation for radiant tube heat transferring process of the gas-infrared heated room was finished. By means of numerical calculation, the influences of radiant tube emittance to the indoor temperature and workspace air temperature as well as the heat radiation flux were studied. The results show: The greater of radiant tube surface emittance, The higher of the total heat flux, meanwhile, workspace average temperature and average radiation temperature are rise.

Irreversibility and Second Law Analysis in a Solar Cooker Box-Type

2015 ◽  
Author(s):  
Hilario Terres ◽  
Sandra Chavez ◽  
Raymundo Lopez ◽  
Arturo Lizardi ◽  
Araceli Lara ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Solar Radiation ◽  
Heat Radiation ◽  
Second Law ◽  
Heating Process ◽  
Water Heating ◽  
Glass Cover ◽  
Heated Water ◽  
Available Energy ◽  
Second Law Analysis

In this work, four different arrangements of solar cooker box-type with internal reflectors results, for irreversibility and second law efficiency are presented. The solar cooker has two glasses in its cover to diminish the losses of heat radiation and convection, which in turn creates the hot house effect inside the cooker. The interior of the cooker has flat mirrors placed at different angles to reflect the solar radiation toward recipient with water. The obtained results are based on the heated water temperatures. These are obtained by means of numerical simulation, which in turn allows the comparison under identical conditions for the cookers. The results reveal that the energy reaching the cookers, less than 5%, is used in the water heating process. Most of the available energy is “stored” into the cooker glass cover, which shows the need for further work on improving cover materials in order to diminish such a situation.

Water uptake by substituted amylose tablets: experimentation and numerical simulation

2009 ◽  
Vol 00 (00) ◽  
pp. 090904073309027-8
Author(s):  
H.W. Wang ◽  
S. Kyriacos ◽  
L. Cartilier
Keyword(s):  
Numerical Simulation ◽  
Water Uptake
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