Aerospace Science and Technology
Experimental Investigation of the Effects of Leading-Edge Serration on the Blades of Savonius Wind Turbine

Sahel Alasvand; Mostafa Kazemi; Mahmood Mani

Volume 17, Issue 1 , June 2024, , Pages 1-8

https://doi.org/10.22034/jast.2023.398694.1150

Abstract
  The noise of wind turbines is mainly of aerodynamic origin and is caused by the impact of the flow on the turbine blade. Therefore, improving the behaviour of the flow around the turbine and reducing aeronoise can result in reducing its annoying noise. In the first step of this research, a suitable serration ...  Read More

Aerospace Science and Technology
Guidelines on Conceptual and Preliminary Design of Hypersonic Waveriders with Different Number of Inlet Ramps

Mohammadreza Varshavi; Sahar Noori

Volume 17, Issue 1 , June 2024, , Pages 11-22

https://doi.org/10.22034/jast.2023.400869.1155

Abstract
  Air-breathing hypersonic flight is presumed by many of the savants in the field of aeronautical engineering as the last boundary of aerial vehicle design to be pushed back. An auspicious design configuration for the prospective hypersonic transport vehicles of the future is a “Waverider,” ...  Read More

Aerospace Science and Technology
Design and Analysis of Supersonic Inlet for Ramjet Engines: Aerodynamic Considerations and Performance Optimization

Mohammad Hossein Moghimi EsfandAbadi; Adnan Mohammadi; Mohammad Hassan Djavareshkian

Volume 17, Issue 1 , June 2024, , Pages 47-59

https://doi.org/10.22034/jast.2023.421137.1165

Abstract
  This research delves into the intricate realm of supersonic inlet design for ramjet engines, honing in on the critical aerodynamic considerations and optimization of performance factors. At Mach 2.5, the study meticulously scrutinizes pivotal design parameters, including the placement and number of inclined ...  Read More

Aerospace Science and Technology
Numerical Study of Flattened Miniature Heat Pipe with Hybrid Porous Wick and Double Heat Sources

G. R. Abdizadeh; Sahar Noori; Mohammad Saeedi; Hamidreza Tajik

Volume 16, Issue 2 , October 2023, , Pages 74-85

https://doi.org/10.22034/jast.2023.400610.1154

Abstract
  Designing flattened miniature heat pipes (FMHPs) for electronic devices is a challenging issue due to high heat flux and limited heat dissipation space. It requires understanding the combined effects of the sintered-grooved wick structure, double heat sources, and flat thickness on heat pipes' thermal ...  Read More

Aerospace Science and Technology
Effects of harmonic control and dynamic twist on helicopter rotor performance in forward flight

Farid Shahmiri; Fatemeh Kiani

Volume 16, Issue 2 , October 2023, , Pages 95-113

https://doi.org/10.22034/jast.2023.357131.1124

Abstract
  The optimum rotor blade planform of helicopters required to minimize power, maximize rotor thrust, and maximize lift-to-drag ratio in forward flight, using a numerical optimization approach, is investigated. Here, the traditional approach is modified by Central Composite Design Data (CCD) and a flight ...  Read More

Aerospace Science and Technology
An enhanced Lattice-Boltzmann method for speeding numerical solutions

Morteza Bayati

Volume 16, Issue 2 , October 2023, , Pages 137-150

https://doi.org/10.22034/jast.2023.376159.1139

Abstract
  Minimizing the computational cost and improving the convergence speed is the main goal of any computational design. In this regard, due to the low convergence speed of the traditional iterative method of fluid flow solution, a new method to improve the traditional iterative method is applied. In this ...  Read More

Aerospace Science and Technology
Darrieus Wind Turbine; Performance Enhancement Due to the Blade Cross-Section Optimization

Jafar Jafari; Hamid Parhizkar; Sajad Ghasemlooy

Volume 16, Issue 1 , June 2023, , Pages 31-47

https://doi.org/10.22034/jast.2023.365726.1134

Abstract
  This research investigates the effect of optimization of blade cross-section on the performance of the Darrieus wind turbine. The fluid flow around a Darrieus wind turbine is simulated by URANS (Unsteady Reynolds Averaged Navier Stokes) method. And blade cross-section was modeled by the Bezier curve ...  Read More

Aerospace Science and Technology
Mixed Convection and Radiation Heat Transfer in an Enclosure Filled with Unevenly Heated Plates at Different Configurations

Sahar Noori; Armin Sheidani; Djavad Kamari

Volume 16, Issue 1 , June 2023, , Pages 124-145

https://doi.org/10.22034/jast.2023.357234.1127

Abstract
  In this study the effect of different configurations of three plates located in an air-filled container, which included vertical, horizontal and tilted, on coupled radiation and natural convection heat transfer has been numerically investigated. The side walls of the cavity were kept a constant temperature, ...  Read More

Aerospace Science and Technology
Droplet Breakup Analysis inside Porous Media at Different Porosities, Using LBM

Mohammad Reza Salimi; Mohammad Taeibi Rahni; Abolfazl Amiri Hezaveh; Mehdi Zakyani Rodsari

Volume 15, Issue 2 , October 2022, , Pages 61-71

https://doi.org/10.22034/jast.2022.322220.1110

Abstract
  In present research, the interaction between single liquid droplet with particles inside a porous media is investigated numerically in two dimensions. The He’s model is used to simulate two phase flow and multiple relaxation time collision operator is implemented to increase numerical stability. ...  Read More

Aerospace Science and Technology
Numerical Investigation of Aerodynamic Performance of Planar/grid Stabilizer wings at Downstream Control Surface in Transonic Flow Regime

Mahdi Miralam; Amir Rahni

Volume 15, Issue 2 , October 2022, , Pages 119-134

https://doi.org/10.22034/jast.2022.245863.1033

Abstract
  In multi-stage Missiles, stabilizer wings are responsible for stabilizing the Missile. The control fins located upstream of the stabilizer wings affect the flow by spinning, which influences stability as well as control. One method for resolving this problem is to design stabilizer wings with less affectability ...  Read More

Aerospace Science and Technology
Localization and aerodynamic improvement of an urban-scale vertical axis wind turbine according to the Sistan climate

Seyed Sam Saham; Saeed Karimian Aliabadi

Volume 15, Issue 2 , October 2022, , Pages 135-145

https://doi.org/10.22034/jast.2022.315321.1106

Abstract
  The use of urban and rural scale wind turbines that in addition to generating power can play the role of old wind turbines in arid areas will be very attractive. In this research it has been tried to first evaluate the wind energy potential in Zahedan city and then to evaluate a sample of vertical axis ...  Read More

Aerospace Science and Technology
Numerical calculation of radiation heating of the hypersonic nose in the reentry phase

Sajad Ghasemlooy; mahsa dehnamaki; Hamid Parhizkar

Volume 15, Issue 1 , June 2022, , Pages 49-60

https://doi.org/10.22034/jast.2021.300023.1089

Abstract
  The calculation of aerodynamic heating is one of the most important steps in designing high speed flying bodies, especially reentry bodies. Because ignoring that, it can damage the thermal protection system and cut off the radar connections to the reentry capsule. Due to the high speed of the capsule ...  Read More

Aerospace Science and Technology
Numerical study on enhancement of low speed axial compressor rotor performance under radial inlet distortion via DBD plasma actuators

Ali Khoshnejad; Reza Ebrahimi; Golamhosein Pouryossefi

Volume 15, Issue 1 , June 2022, , Pages 116-128

https://doi.org/10.22034/jast.2021.309899.1102

Abstract
  Aero-engine entrance conditions are not always ideal and, for various reasons, inlet distortion may occur and cause inlet blockage and reduction of compressor performance. The aim of this study was to numerically simulate the effects of plasma actuators on the enhancement of low-speed axial compressor ...  Read More

Aerospace Science and Technology
Aerodynamic Optimization of a Wind Turbine Blade for Maximum Annual Energy Production at Manjil Wind Farm

Mahdi Azizi; Alireza Jahangirian

Volume 14, Issue 2 , October 2021, , Pages 1-9

https://doi.org/10.22034/jast.2021.129714

Abstract
  To keep pace with current trends in the wind industry, this paper aims at the improvement of the annual energy production of a horizontal axis wind turbine by aerodynamic optimization of blades at the wind conditions of the Manjil site. To achieve this goal, the Riso wind turbine, whose characteristics ...  Read More

Aerospace Science and Technology
A numerical investigation on the roll damping coefficient of a typical airship based on the computational fluid dynamics

Alireza Akbari; Sahar Noori; Payman Spahvand

Volume 14, Issue 2 , October 2021, , Pages 10-18

https://doi.org/10.22034/jast.2021.134730

Abstract
  The main application of dynamic coefficients is in the flight path simulation and autopilot design of flying objects. This paper reveals a general process for calculating the roll damping coefficient of a typical airship. The process presented in this article has a step-by-step path that can be used ...  Read More

Aerospace Science and Technology
A new method to primary and optimized design of ducted fan

Ahmad Sharafi

Volume 14, Issue 2 , October 2021, , Pages 52-65

Abstract
  In the present study, the aerodynamic performance of the ducted fan is investigated using the surface vorticity method and the lifting line theory. In previous research, to consider the effects of the duct, most of the parameters derived from empirical tests or computational fluid dynamics. Our goal ...  Read More

Aerospace Science and Technology
Numerical Investigation on Flow Control of a Small Horizontal Axis Wind Turbine Using Dielectric Barrier Discharge Plasma Actuator

Majid Sedghi; Rouhollah Khoshkhoo

Volume 14, Issue 2 , October 2021, , Pages 96-105

https://doi.org/10.22034/jast.2021.294455.1078

Abstract
  This research aims to numerically investigate the efficiency of the plasma actuator in a small wind turbine. The studies were conducted on a domestic wind turbine with a diameter of 1.93 m and the Suzen-Huang model was employed to simulate the DBD plasma actuator. In this research, first, a wind turbine ...  Read More

Aerospace Science and Technology
Investigation of fin changes effects on aerodynamic performance of airship

Sahar Noori; Mohamad Saleh Afshar; Nima Karimi

Volume 14, Issue 1 , June 2021, , Pages 1-10

https://doi.org/10.22034/jast.2021.133173

Abstract
  Airships usually have low cruising speed due to their large volume and high drag level. This makes the aerodynamic design of the vehicle, including the surfaces shape, the length-to-diameter ratio and the position of the fins, all very important. Furthermore, an important parameter in the vehicle aerodynamic ...  Read More

Aerospace Science and Technology
Experimental Investigation of using Plasma Actuators as Virtual Gurney Flap

Bahareh Mojarrad; Saeed Oveisi; Mostafa Kazemi; Mahmoud Mani

Volume 14, Issue 1 , June 2021, , Pages 103-110

https://doi.org/10.22034/jast.2021.297217.1085

Abstract
  The primary objective of this study was to demonstrate how plasma actuators could be used to discharge a perpendicular dielectric barrier as a virtual Gurney flap. This study utilized wind tunnel experiments on a flat plate airfoil. Each experiment is conducted at two different free flow velocities of ...  Read More

Aerospace Science and Technology
Investigating the Effect of Different Winglet Cant Angles on a Supercritical Wing Aerodynamic Efficiency at Lower Reynolds numbers

Parisa Ghanooni; Mostafa Kazemi; Mahmoud Mani

Volume 14, Issue 1 , June 2021, , Pages 111-116

https://doi.org/10.22034/jast.2021.297211.1084

Abstract
  This study focuses on improving performance of a supercritical wing equipped with winglets at different cant angles. This study aims to experimentally investigate the variation of aerodynamic performance of a supercritical wing of NASA Sc (2)-0410 airfoil at lower Reynolds numbers with winglets at various ...  Read More

Aerospace Science and Technology
A Numerical Study on the Aeroacoustic Radiation from a Finite Length Rotating Cylinder

Hamid Reza Talesh Bahrami; Sajad Ghasemlooy; hamid Parhizkar

Volume 12, Issue 1 , March 2019, , Pages 65-74

Abstract
  Rotating cylinders have wide applications in different areas, especially the aerodynamic area. However, the acoustic behaviors of these components have not been widely studied. The generating noise from a spinning cylinder is mainly due to the detached vortices from the leeward of the body. In this study, ...  Read More