Stagnation Pressure
Stagnation Pressure - Related Videos
01:24
Static, Stagnation, Dynamic and Total Pressure
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2026
The concept of static, stagnation, dynamic, and total pressure is fundamental in fluid dynamics, often explained using Bernoulli's equation: Here, p is static pressure,1/2⍴V2 is dynamic pressure, γz is hydrostatic pressure or potential energy pressure, and pT is total pressure, constant along a streamline for incompressible flows. 1. Static Pressure (p): This is the pressure exerted by a fluid at rest or as if flowing fluid is brought to rest in the direction of motion. It is measured using a...
08:12
Pressure Transducer: Calibration Using a Pitot-static Tube
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2023
Source: Shreyas Narsipur, Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, NC Fluid pressure is an important flow characteristic that is required to determine the aerodynamics of a system. One of the oldest and still existing pressure measurement systems is the manometer due to its accuracy and simplicity of operation. The manometer is generally a U-shaped glass tube that is partially filled with liquid, as shown in Figure 1. The U-tube manometer requires no...
07:26
Synthesis and Microdiffraction at Extreme Pressures and Temperatures
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Cited by 5 •
2013
The laser heated diamond anvil cell combined with synchrotron micro-diffraction techniques allows researchers to explore the nature and properties of new phases of matter at extreme pressure and temperature (PT) conditions. Heterogeneous samples can be characterized in situ under high pressure by 2D mapping and combined powder, single-crystal and multigrain diffraction approaches.
10:22
Nozzle Analysis: Variations in Mach Number and Pressure Along a Converging and a Converging-diverging Nozzle
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2023
Source: Shreyas Narsipur, Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, NC A nozzle is a device that is commonly used to accelerate or decelerate flow by virtue of its varying cross-section. Nozzles are widely used in aerospace propulsion systems. In rockets, propellant that is ejected from the chamber is accelerated through a nozzle to create a reaction force that propels the system. In jet engines, a nozzle is used to transform energy from a high-pressure...
02:34
Vapor Pressure
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2020
When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules move randomly about, they will occasionally collide with the surface of the condensed phase, and in some cases, these collisions will result in the molecules re-entering the condensed phase. The change from the gas phase to the liquid is called condensation. When the rate of condensation becomes equal to the rate of vaporization, neither the amount of the liquid nor the amount of the vapor...
FAQs
In an ideal incompressible flow, stagnation pressure combines static pressure with dynamic pressure, the pressure contribution associated with motion. Bernoulli’s principle treats their sum as constant along a streamline when the ideal assumptions apply. This relationship lets engineers interpret how pressure changes as flow speed changes, especially when evaluating acceleration through a nozzle or deceleration in a diffuser.
For compressible flow, density changes prevent a simple incompressible pressure addition from describing deceleration accurately. Isentropic analysis instead connects stagnation pressure with Mach number and the fluid’s specific-heat ratio. Mach number represents flow speed relative to sound speed, while specific-heat ratio characterizes thermodynamic behavior. These variables support pressure predictions for high-speed engineering flows.
A reduction in stagnation pressure between two locations signals that the flow has experienced irreversible effects rather than merely a reversible change in speed or static pressure. Shocks, friction, turbulence, and other irreversibilities can produce this decrease. Comparing values therefore helps engineers distinguish pressure redistribution from actual flow losses in connected components.
Static pressure describes the pressure associated with the fluid at its current flow condition, whereas stagnation pressure provides a reference for the pressure reached during ideal deceleration. Their relationship changes as velocity changes, even when the flow remains ideal. Examining both values helps engineers interpret acceleration in nozzles and deceleration in diffusers without confusing motion-related effects with losses.
Engineers compare stagnation-pressure values at selected upstream and downstream locations. For an ideal incompressible analysis, Bernoulli’s principle relates the result to static and dynamic pressure. For compressible conditions, Mach number and specific-heat ratio are included through isentropic analysis. A downstream reduction then indicates losses associated with shocks, friction, turbulence, or other irreversible processes.
Stagnation-pressure analysis supports the evaluation of nozzles, diffusers, wind-tunnel flows, turbines, compressors, and propulsion systems. In these applications, the quantity helps connect flow speed, static pressure, and compressible-flow behavior. Comparing values across a device also provides an indication of whether shocks, friction, turbulence, or other irreversibilities have reduced the available flow energy.