Research Article
Influence of Mach Number on the Aerodynamic Performance of a Biconvex Airfoil
Issue:
Volume 10, Issue 2, April 2025
Pages:
11-17
Received:
15 February 2025
Accepted:
24 February 2025
Published:
7 March 2025
DOI:
10.11648/j.eas.20251002.11
Downloads:
Views:
Abstract: This study concentrated on numerically simulating the behavior of a biconvex airfoil under compressible flow conditions. A turbulent, two-dimensional, compressible steady flow is considered. The study entails examining the biconvex airfoil's aerodynamic properties as the Mach number increases. The flow turbulence was predicted by the simulations using the SST k-ω viscous modelling and Reynolds-averaged Navier-Stokes equations. Under turbulent and steady-state flow conditions, simulations were done using commercial ANSYS FLUENT software. Both viscid and inviscid flows were considered. Validation is done with the help of existing literature. Mesh independency test is done. Visualization is also done to understand the flow conditions clearly. The simulations were done for Mach number 1.1, 1.3 and 1.5. According to the findings, the coefficient of lift rises as the angle of attack increases but falls as the Mach number increases. The delay of boundary layer separation causes the flow separation to lag as the Mach number rises. As the angle of attack increases, the coefficient of drag also rises. For both viscid and inviscid flows, the stall angle changes from 24° to 28° as the Mach number rises from Ma=1.1 to 1.5. The airfoil shows maximum aerodynamic performance at Ma = 1.1 with the highest magnitude of coefficient of lift.
Abstract: This study concentrated on numerically simulating the behavior of a biconvex airfoil under compressible flow conditions. A turbulent, two-dimensional, compressible steady flow is considered. The study entails examining the biconvex airfoil's aerodynamic properties as the Mach number increases. The flow turbulence was predicted by the simulations us...
Show More
Review Article
Effects and Mitigations Reviews of Water Logging and Salinity Problems on Agricultural Land in the Case of Ethiopia
Ayana Bulti Olana*
Issue:
Volume 10, Issue 2, April 2025
Pages:
18-26
Received:
25 March 2025
Accepted:
9 April 2025
Published:
29 April 2025
DOI:
10.11648/j.eas.20251002.12
Downloads:
Views:
Abstract: This paper reviews sources, causes, extent, effect, and remedies of problems with waterlogging and salinity in the agricultural land in the case of Ethiopia. Due to extensive seepage into the groundwater and agricultural problems land suffers from waterlogging and salinization. These issues can be managed by using either preventive or corrective strategies. Waterlogging and salinization are serious obstacles to the long-term viability of irrigated agricultural lands and the livelihoods of farmers in the afflicted areas, particularly smallholders. Waterlogging and salinization are caused by a variety of circumstances, including seepage from unlined clay canals, insufficient surface and subsurface drainage, poor water management methods, insufficient water supply, and irrigation with low-quality groundwater. According to the reviews, the surface drainage systems built were initially successful in lowering groundwater levels in an agricultural area selected based on the economy of the farmer. Overall success was restricted, however, due to poor system operation and maintenance, as well as a lack of suitable facilities for the disposal of saline drainage effluent. To put it another way, lowering groundwater levels through deep tube wells, salt leaching from excessive irrigation, chemical additions (gypsum, acids, organic matter), and biological and physical approaches are all options. Generally, this review paper gives an overview of several solutions for waterlogging and salinity concerns as well as their appropriateness and limitations in areas of agricultural lands.
Abstract: This paper reviews sources, causes, extent, effect, and remedies of problems with waterlogging and salinity in the agricultural land in the case of Ethiopia. Due to extensive seepage into the groundwater and agricultural problems land suffers from waterlogging and salinization. These issues can be managed by using either preventive or corrective st...
Show More
