The coefficient of drag (Cd), also known as the drag coefficient, is a dimensionless parameter used to quantify the resistance or drag experienced by an object as it moves through a fluid, such as air or water. It is an essential concept in fluid dynamics and aerodynamics. cd is the drag coefficient. D’ is the […]
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The coefficient of lift (cl) for a two-dimensional body, such as an airfoil, is a dimensionless parameter used to describe the lift generated by the body in a fluid flow. It represents the lift force per unit span of the body, normalized by the dynamic pressure of the incoming flow and a reference area. cl
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In flight mechanics, the term “total head ahead of the disc” refers to the total energy present in the airflow ahead of a rotating propeller or rotor disc in an aircraft. It is also known as “total pressure” or “stagnation pressure” ahead of the disc. Total head is the measure of a pump’s ability to
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In flight mechanics, the term “area of disc” refers to the total area swept by the blades of a rotating propeller or rotor. This concept is important in the study of aircraft propulsion systems and rotorcraft aerodynamics. A = Ï€/4 * d^2 d means diameter of the propeller
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The Turbulent Prandtl Number, denoted as PrT, is a dimensionless quantity used in fluid mechanics to characterize the behavior of turbulent flows with respect to heat transfer. It is an extension of the concept of Prandtl Number (Pr), which is used for laminar flows. μT is the eddy viscosity of the fluid (momentum diffusivity). cp
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Turbulent thermal conductivity (kT​) refers to the effective thermal conductivity of a fluid when it is experiencing turbulent flow. Thermal conductivity is a property that quantifies a material’s ability to conduct heat, representing the rate at which heat is transferred through the material due to a temperature gradient. kT​ is the turbulent thermal conductivity, μT​
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In flight mechanics, the “boundary layer” is a thin layer of air that forms near the surface of an aircraft’s wing or other aerodynamic surfaces as it moves through the air. This layer of air experiences a gradual transition from the free-stream airflow (far away from the surface) to a velocity of zero at the
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The velocity potential represents the scalar potential function in the two-dimensional irrotational flow, and it helps describe the flow patterns resulting from fluid emanating radially from a single point (source) or converging toward it (sink). It is a fundamental concept in potential flow theory, which assumes that the flow is inviscid (neglects viscosity) and irrotational
In flight mechanics and aerodynamics, the coefficient of drag (CD) with respect to angle of attack refers to how the drag force acting on an airfoil or wing changes as the angle of attack (α) is varied. Cn sin(alpha)+Cc cos(alpha) Cn: The normal force coefficient, which represents the lift force component perpendicular to the relative
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CL” stands for the “Coefficient of Lift.” It is a dimensionless quantity that represents the lift generated by an airfoil or wing at a specific angle of attack. The coefficient of lift is a crucial parameter in understanding and analyzing the aerodynamic performance of an aircraft. Cn cos(alpha)-Cc sin(alpha) Cn: The normal force coefficient, which
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