Kokkupõrkerõhku

Kokkupõrkerõhku, also known as impact pressure or stagnation pressure, is a concept in fluid dynamics. It represents the pressure exerted on a fluid when it is brought to rest abruptly and isentropically. This occurs when a moving fluid is forced to stop its motion against a solid surface. The kinetic energy of the fluid is converted into potential energy in the form of pressure.

The formula for kokkupõrkerõhku (P_stag) is derived from Bernoulli's principle. For incompressible flow, it is given by P_stag = P_static + (1/2) * rho * v^2, where P_static is the static pressure of the fluid, rho is its density, and v is its velocity. In compressible flow, the relationship is more complex and depends on the specific heat ratio of the gas.

Kokkupõrkerõhku is a crucial parameter in various engineering applications. For instance, it is used in the design of Pitot tubes, which measure fluid velocity by comparing the static pressure to the stagnation pressure. It also plays a role in understanding aerodynamic forces on aircraft and vehicles, as well as in the design of turbines and pumps. The point where the fluid is brought to rest is called the stagnation point.

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