Numerical Modeling of plasma flow in an Electrohydrodynamic thruster with two-cathode electrode arrangement
Alireza
Fathi
Department of New Technologies Engineering, Shahid Beheshti University, Tehran, IRAN
author
Mahdy
Ahangar
Department of New Technologies Engineering, Shahid Beheshti University, Tehran, IRAN
author
text
article
2019
per
corona discharge which had been considered undesired before, has become popular for different uses in the past decades; including space thrusters. The basic corona discharge has a simple setup including two electrodes with unequal cross-sections; one of which connected to a high voltage and the other connected to ground or opposite voltage. By changing the number of electrodes, the efficiency of corona discharge can be improved. In this paper, number of electrodes have been changed from 2 to 3 in order to study an electrohydrodynamic thruster. Flow characteristics have been studied by solving the electrostatics and Navier-Stokes equations by finite element method (FEM). The results show that with increasing the number of cathodes the thrust, electric current and thrust efficiency will also increase. In similar condition and geometry, maximum produced velocity resulted by applying any electric potential to anode, increases by about 30% in comparison with one-cathode setup.
Space Science and Technology
Iranian Aerospace Society -Aerospace Research Institute
2008-4560
12
v.
2
no.
2019
1
10
https://jsst.ias.ir/article_82177_7c3ed465d828806e0450d4921c5d05b4.pdf
dx.doi.org/10.30699/jsst.2019.82177
Provide a Predictive Model for the Preliminary Design of Swirl Injectors Based on Neuro-Fuzzy Model Thruster
Hadiseh
Karimaei
Faculty Member, Department of Space Sciences, Aerospace Systems Research Institute, Aerospace Research Institute, Tehran, Iran
author
text
article
2019
per
the effect of the internal geometry of the injector of a low-thrust monopropellant thruster on the characteristics of the outlet liquid sheet, such as the liquid sheet thickness, the spray cone angle, the average output velocity, and its mass flow rate, have been studied. For this purpose, simulation of the internal flow based on the computational fluid dynamics was performed to predict the output flow characteristics, then parametric studies were conducted to investigate the effect of geometry. In order to extract a predictive model for the preliminary design of the injector, a neural fuzzy network model was used. Using this model, the results of parametric analyzes were used to obtain a geometric specification without geometric modeling and computational fluid dynamics analysis or the use of initial design methods. The purpose of the implementation of the neural network model is to obtain an estimate of the internal geometry of the injector by entering the desired macroscopic characteristics of the output flow.
Space Science and Technology
Iranian Aerospace Society -Aerospace Research Institute
2008-4560
12
v.
2
no.
2019
11
21
https://jsst.ias.ir/article_81952_5f8ad756e08c45959fd0e87ac38d140b.pdf
dx.doi.org/10.30699/jsst.2019.81952
Numerical simulation of complicated grains with 3D burnback and Quasi-One-Dimensional flow field of solid rocket motors
mohammad
shahbazi
Department of Mechanical Engineering, Faculty of Mechanical Engineering, Arak University, Arak, Iran
author
mohammad
razmjooei
Department of Aerospace Engineering, Faculty of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran
author
Fatholah
Ommi
Department of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran
author
text
article
2019
per
In this research, the 3D grain burnback with quasi-one-dimensional internal ballistic in a solid rocket motor is simulated using the Level set theory and the utilization of Sections method, while achieving high accuracy in the simulation of green's post-back analysis time can also be significantly reduced. By using Section method, 3D grains are divided to many 2D grain, then 2D Level set is utilized to analyse grain burnback. Finally, the burning port of 3D grains are calculated by means of Interpolation. Also, to predict the internal pressure of the motor and the burning rate, a numerical code is written and coupled with grain burnback programme.
Space Science and Technology
Iranian Aerospace Society -Aerospace Research Institute
2008-4560
12
v.
2
no.
2019
23
41
https://jsst.ias.ir/article_82282_ab6ee10337894556193303a2646fd5a3.pdf
dx.doi.org/10.30699/jsst.2019.82282
Design and manufacturing of the antenna motion mechanisms of a communication satellite
Mohammad
Salari
Assistant Professor, Department of Mechanical Engineering, Faculty of Engineering, Qom University, Qom, IRAN
author
text
article
2019
per
In this paper, design and simulation of a deployment and release mechanism of a communication satellite antenna are described. Because of the simplicity and reliability of the system, a torsion spring is used to excite the antenna. Dynamic simulation is performed by Adams Software and the appropriate spring and damper are selected for the mechanism. Also, a thermal cutter mechanism is used for the release mechanism of the antenna that shows a good performance in the tests. Also, a finite element analysis is performed to ensure the structural strength of the mechanism by Nastran-Patran Software. According to the results of the tests and simulations performed on the system, one can say that this mechanism is a simple, functional and reliable mechanism and can be done well the assigned duties in accordance with the requirements of the employer and the ECSS standard.
Space Science and Technology
Iranian Aerospace Society -Aerospace Research Institute
2008-4560
12
v.
2
no.
2019
43
53
https://jsst.ias.ir/article_86064_ecb16c4db93cf01c063720ff361512c5.pdf
dx.doi.org/10.30699/jsst.2019.86064
Design and implementation of hardware-in-the-loop (HIL) test-bed for spacecraft attitude control
Vahid
Bohlouri
Iranian Space Research Center
author
Hosein
Haghighi
Iran university
author
Samane
Kaviri
Iranian Space Research Center
author
Marzieh
Taghinezhad
Iranian Space Research Center
author
ehsan
maani
Department of Mechanical Engineering, University of Tehran, Tehran, Iran.
author
Soheil
Seyedzamani
Iranian Space Research Center
author
text
article
2019
per
In this paper, the design and implementation of hardware-in-the-loop (HIL) test-bed for spacecraft attitude control are presented with respect to the practical consideration. This test-bed includes an air bearing 3-DOF table, Helmholtz coil, sun simulator, orbit simulator, reaction wheels and torqrods as actuators, gyro, GPS, AHRS, magnetometer, and processing board. In addition, online monitoring of attitude and orbit position in LabVIEW and Celestia software, data telemetry, battery package and power distribution board are developed in this case. Using this test-bed, different operational modes are evaluated and verified for satellite attitude control. The experimental results of damping mode show that the capability of decreasing the angular velocity to the desired value (0.3 deg/s). Moreover, a torque simulator to apply the disturbances and test of propulsion scenarios, online telemetry with ground station, near-optimal design of Helmholtz coil are the advantages of this test-bed.
Space Science and Technology
Iranian Aerospace Society -Aerospace Research Institute
2008-4560
12
v.
2
no.
2019
55
70
https://jsst.ias.ir/article_184934_a1f9e8803375c97f0d0f5c490470d764.pdf
dx.doi.org/10.30699/jsst.2019.86089
Title: Effect of six-week high intensity interval training under simulated microgravity condition on morphology of radial nerve myelin sheet in male rats
hossein
ghadampour-vahed
Faculty of Physical Education and Sport Sciences Kharazmi-Tehran-Sports Physiology Department
author
Ali
Kazemi
Assistant Professor, physical education and sport science faculty, Kharazmi University, Tehran, Iran
author
bagher
minaei
Professor of Faculty of Medical Sciences, Tehran University of Medical Sciences
author
zabih allah
ghadampour-vahed
University of Isfahan- Faculty of Physical Education and Sport Sciences - Sport Physiology Department
author
text
article
2019
per
The purpose of this study was to investigate the effect of six weeks of HIIT under simulated microgravity condition on morphological changes of radial nerve myelin sheath in male rats. In present study, 24 male wistar rats were randomly selected and divided into four groups including: TS(training during suspension:n=6), CS(suspension:n=6), T(training:n=6), C(control:n=6). The training groups run on treadmill for six weeks (five days in week). 24 hours after the last training session, the animals were prepared for tissue samples. At the end of the experiment, changes in myelin sheath were measured by Luxol fast blue. Our results showed that the percentage of changes in myelin sheath in HIIT group under simulate microgravity (p≤0.001) was highest than other groups, significantly (30/27+5/27). Based on the results, HIIT under simulated microgravity condition affected on changes in myelin sheath, Therefore, it seems that can play an effective role in improvement of the clinical status of neurological patients and decrease side effects in Astronauts.
Space Science and Technology
Iranian Aerospace Society -Aerospace Research Institute
2008-4560
12
v.
2
no.
2019
71
78
https://jsst.ias.ir/article_184937_c30ecb61560d666723baec119e1178f9.pdf
dx.doi.org/10.30699/jsst.2019.82178