In a diffuser, the inlet velocity refers to the velocity of the fluid at the entrance or inlet of the diffuser. The diffuser is a device designed to slow down the fluid and increase its pressure by gradually expanding the flow area. When fluid enters a diffuser, it typically has a certain initial velocity (V1) […]
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The advance ratio (J) is a dimensionless parameter used in the analysis of propellers and rotors, particularly in the field of aerodynamics and flight mechanics. It describes the ratio of the forward speed of the aircraft or vehicle to the rotational speed of the propeller or rotor. The advance ratio is an important parameter in
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The power coefficient is a dimensionless parameter used to characterize the power requirements of an aircraft or an aerial vehicle during steady-level flight. It represents the ratio of the power required to maintain the aircraft’s flight to the power available from the engine or propulsion system. CP = Power coefficient P = Power extracted from
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In aeronautics, wave drag is a component of the aerodynamic drag on aircraft wings and fuselage, propeller blade tips and projectiles moving at transonic and supersonic speeds, due to the presence of shock waves123. At zero angle of attack, the symmetrical airfoil produces no lift. Thus, a positive angle of attack is required if the
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Geopotential altitude is a vertical coordinate referenced to Earth’s mean sea level. It is an adjustment to geometric altitude, which is the altitude as measured from the mean sea level. Geopotential altitude accounts for the variation of gravity with latitude and altitude. ‘R ’ is the radius of earth and ‘hG’ is the geometric altitude
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The velocity flow of an incompressible, inviscid fluid along a streamline is governed by Bernoulli’s equation. This equation describes the conservation of energy along a streamline in a steady flow of an ideal fluid, where no energy is lost due to friction or viscosity. V is the velocity at a specific point in the flow
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The time period of a pendulum’s oscillation refers to the time it takes for the pendulum to complete one full back-and-forth swing, from one extreme point to the other and back again. It is the time duration of a single oscillation. T is the time period of the pendulum’s oscillation (measured in seconds). π (pi)
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Mass flux, also known as mass flow flux or mass transfer flux, is a measure of the amount of mass passing through a unit area per unit of time. It is used to describe the rate at which mass is transferred across a specified surface or interface. mass flux is the mass flow rate per
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Mass flow refers to the movement or transfer of mass (matter) through a specific point or area within a given period of time. ṁ is the mass flow rate (measured in kg/s or other mass units per unit of time). ρ is the density of the fluid (measured in kg/m³). Vn is the velocity of
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