back pressure


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back pressure

[′bak ‚presh·ər]
(mechanics)
Pressure due to a force that is operating in a direction opposite to that being considered, such as that of a fluid flow.
(mechanical engineering)
Resistance transferred from rock into the drill stem when the bit is being fed at a faster rate than the bit can cut.

Back Pressure

 

the pressure of steam or gas at the end of the expansion process in a heat engine, such as a steam or gas turbine or a steam engine. The term “back pressure” is used to define the final pressure that exists when the expansion does not terminate in the condensation of the steam. In a steam turbine with back pressure, the exhaust steam is not condensed and, instead, is used as a source of heat for either an industrial process or another turbine.

back pressure

Pressure developed in opposition to the flow of liquid or gas in a pipe, duct, conduit, etc.; due to friction, gravity, or some other restriction to flow of the conveyed fluid.

back pressure

A pressure exerted backward; in a field of fluid flow, a pressure exerted contrary to the pressure producing the main flow. Specifically, the pressure inside the exhaust system of a reciprocating engine that prevents the flow of burned gases from the cylinders.
References in periodicals archive ?
There is another issue, when the back pressure during the flare is too much, the natural tendency is to put both hands on the yoke--the "two-handed landing." I prefer the pilot to have one hand on the yoke and the other hand on the throttle.
In terms of the vapor phase, when the back pressure was 40kPa, higher fuel temperature led to larger intensity percentage of mode 1, which demonstrated a more stable vapor distribution.
The type of control valves can vary based on the flow and back pressure required.
When the back pressure on the screw was increased from 0.7 MPa to 2.5 MPa, the fraction of parts with black streaks decreased from 50% down to less than 10%.
Using the back pressure technique to launch, the missile could easily be used for training purposes in Pakistan Army, he viewed while talking to media.
Part of the WingNutz line, which require no back pressure and are easy to operate, this short-reed call has a higher pitch to grab those Canada's attention.
Mechanical back pressure system for a large range of back pressures offers a competitive advantage.
A modified engine management and turbocharger system, sports exhaust with reduced back pressure - and the ability to run on 98-octane fuel - have all contributed to the rise in power.
The BelGAS division of Marsh Bellofram has introduced the Type P289, described as a high-performance industry back pressure regulator, also functioning as a high-flow relief valve with an adjustable set point.
The orbital, flow-regulated coring controls with back pressure and down pressure gauges make coring easy and accurate.
They protect drinking water systems against back pressure, back flow and back siphonage, ensuring compliance with relevant water regulations.