Preferred Language
Articles
/
joe-1553
Numerical Investigation of Aerodynamic Characteristics of Supercritical RAE2822 Airfoil with Gurney Flap
...Show More Authors

Gurney flap (GF) is well-known as one of the most attractive plain flaps because of the simple configuration and effectiveness in improving the lift of the airfoil. Many studies were conducted, but the effects of GF on the various airfoil types need to be further investigated. This study aimed to clarify the effect of GF in the case of the supercritical airfoil RAE2822. This research includes a steady, two-dimensional computational investigation carried out on the supercritical airfoil type RAE-2822 to analyze Gurney flap (GF) effects on the aerodynamic characteristics of this type of airfoil utilizing the Spalart-Allmaras turbulence model within the commercial software Fluent. The airfoil with the Gurney flap was analyzed for three different height values 1%c, 2%c, and 3%c, and five mounting angles (30°,45°,60°,75°, and 90°) with the axial chord for angles of attack (-1°,-2°,-3°,0°,1°,2°,3°). The calculations showed that when GF height is increased, the maximum suction pressure on the upper surface increases by 25.4%, 36.5%, and 68.83% when the height of the Gurney flap is 1%c, 2%c, and 3%c, respectively, compared with that on the airfoil without GF. The lift coefficient was also increased, and the shock waves moved downward by increasing GF height. As Gurney flap heights increase, the drag coefficient increases gradually for positive angles of attack but for negative angles of attack. The drag coefficient also decreases with increasing the GF heights. As long as the angle of the mounting is between 45o and 90o, the lift coefficient does not differ on a large scale. For mounting angles less than 45o, the lift coefficient drops quite fast. As a result, reducing the Gurney flap’s lift enhancement and the drag coefficient increases gradually for positive angles of attack, but for negative angles, it can be noted that the drag coefficient decreases with increasing the mounting angles of GF. The calculated values of the lift and drag coefficients with an attack angle and pressure coefficient compared with the experimental values, and a good agreement was noticed. 

 

Scopus Crossref
View Publication Preview PDF
Quick Preview PDF
Publication Date
Sun Mar 04 2018
Journal Name
Baghdad Science Journal
Enhanced Photocurrent of Titania Nanotube Photoelectrode Decorated with CdS Nanoparticles
...Show More Authors

In this work, CdS/TiO2 nanotubes composite nanofilms were successfully synthesized via electrodeposition technique. TiO2 titania nanotube arrays (NTAs) are commonly used in photoelectrochemical cells as the photoelectrode due to their high surface area, excellent charge transfer between interfaces and fewer interfacial grain boundaries. The anodization technique of titanium foil was used to prepare TiO2 NTAs photoelectrode. The concentration of CdCl2 played an important role in the formation of CdS nanoparticles. Field emission scanning electron microscopy (FESEM) shows that the CdS nanoparticles were well deposited onto the outer and inner of nanotube at 40 mM of CdCl2. X-ray diffraction (XRD) and energy dispersive X-ray (EDX) analyses wer

... Show More
View Publication Preview PDF
Scopus (13)
Crossref (6)
Scopus Clarivate Crossref
Publication Date
Fri Jan 14 2022
Journal Name
Comparative Clinical Pathology
Evaluation of mice testosterone and sperm parameters affected with Crocin
...Show More Authors

View Publication
Scopus (2)
Scopus Crossref
Publication Date
Mon Feb 01 2021
Journal Name
Iop Conference Series: Materials Science And Engineering
A Critical Review of Subgrade Soil Reinforced with Geo-synthetics
...Show More Authors
Abstract<p>Recently, the application of geosynthetics in the reinforcement of weak subgrade is expanded dramatically. However, selection of the geo-material that fits site conditions and soil type is crucial to achieving the success of the overall performance of such improvement. Also, the road life and cost construction are significant keys for evaluating this type of ground treatment. This paper presents an overview of the subgrade strengthening with geosynthetics to acquire a better understanding of the technique and to provide a clear guide for transportation and geotechnical engineers. The rutting failure along with its main causes are highlighted briefly. The types of geosynthetics, their applications and</p> ... Show More
View Publication
Crossref (3)
Crossref
Publication Date
Fri Oct 23 2020
Journal Name
Medico-legal Update
Levels of Some Cytokines in Iraqi Patients with Multiple Myeloma
...Show More Authors

View Publication
Crossref
Publication Date
Sat Sep 01 2018
Journal Name
2018 11th International Conference On Developments In Esystems Engineering (dese)
Sustainability Analysis and Shear Capacity of BubbleDeck Slabs with Openings
...Show More Authors

View Publication
Crossref (5)
Crossref
Publication Date
Fri Dec 20 2024
Journal Name
Bulletin Of The Iraq Natural History Museum
ADDITIONAL INFORMATION WITH A CHECKLIST OF LAND SNAILS IN IRAQ
...Show More Authors

Land snails constitute an important group of mollusks distributed worldwide. This study reports on land snails found in Iraq. A survey of terrestrial gastropods was performed during their activity seasons in gardens, agricultural lands and nurseries in Iraq from March 2022 to September 2023. Fifteen terrestrial snails belonging to seven families were documented. The species Euchondrus michonii (Bourguignat, 1853) was identified and recorded based on several distinct conchological characters for the first time in Iraq. The recently collected specimens, along with those previously recorded in Iraq, were included in this checklist. Essential information on each species is also presented. As there is no previous checklist or study that

... Show More
View Publication
Scopus Crossref
Publication Date
Sat Apr 01 2017
Journal Name
Iraqi Journal Of Cancer And Medical Genetics
Mitotic activity of cultured human lymphocytes treated with gold nanoparticles
...Show More Authors

Potential health and environmental effects of nanoparticles need to be thoroughly assessed before their widespread commercialization. The present investigation was planned with the aims to determine the effects of gold nanoparticles (GNPs) on blast (BI) and mitotic (MI) indices of cultured lymphocytes. The results revealed that BI (50.3±2.3, 30.2±1.9, 10.5±0.7 and 0.0%, respectively) and MI (70.1±2.9, 20.4±1.1, 5.3±0.1 and 0.0%, respectively) showed a gradual decreased percentage as the concentration of GNPs was increased from 0.085 to 0.66 µg/mL, and the difference was significant compared to control culture (81.6±2.5 and 90.2±3.7%, respectively). A maximum inhibition of BI and MI was occurred at the concentration 0.66 µg/mL. In

... Show More
Publication Date
Wed Jan 01 2014
Journal Name
Journal Of Engineering
Punching Shear Strength of Reinforced Concrete Flat Plates with Openings
...Show More Authors

Publication Date
Fri Apr 01 2022
Journal Name
Bulletin Of Electrical Engineering And Informatics
Improvement of energy consumption in MIMO with cognitive radio networks
...Show More Authors

The employment of cognitive radio (CR) is critical to the successful development of wireless communications. In this field, especially when using the multiple input multiple output (MIMO) antenna technology, energy consumption is critical. If the principal user (PU) is present, developers can utilize the energy detecting approach to tell. The researchers employed two distinct phases to conduct their research: the intense and accurate sensing stages. After the furious sensing step was completed, the PU user was identified as having a maximum or minimal energy channel. There are two situations in which the proposed algorithm's performance is tested: channels for fading AWGN and Rayleigh. When the proposed methods' simulation results a

... Show More
View Publication
Scopus (1)
Scopus Crossref
Publication Date
Sat Dec 01 2018
Journal Name
Journal Of Coloproctology
Role of adiponectin in patients with inflammatory bowel disease unclassified
...Show More Authors
Abstract<p> Background Inflammatory bowel disease (IBD) is a lifestyle idiopathic, chronic, and inflammatory intestinal disorders that required long-term medications and care.</p><p> Aim of the study Assess the level of adiponectin in IBDU and its relation with different parameters like lipid profile and Body Mass Index (BMI).</p><p> Type of the study A case-controlled study.</p><p> Patients and methods The total number of study groups was sixty individuals, forty of them were patients with inflammatory bowel disease unclassified and the rest were control healthy subjects. Serums were examined for lipid profile (cholesterol, triglycer</p> ... Show More
View Publication
Scopus (5)
Crossref (2)
Scopus Crossref