111:, however, the situation is more complicated, due to the need to prevent unburned fuel/air mixture from passing right through the cylinders into the exhaust. During the exhaust phase of the cycle, backpressure is even more undesirable than in a four-stroke engine, as there is less time available for exhaust and the lack of pumping action from the piston to force the exhaust out of the cylinder. However, since the exhaust port necessarily remains open for a time after scavenging is completed, unburned mixture can follow the exhaust out of the cylinder, wasting fuel and increasing pollution. This can only be prevented if the pressure at the exhaust port is greater than that in the cylinder. Since the timing of this process is determined mainly by exhaust system geometry, which is extremely difficult to make variable, correct timing and therefore optimum engine efficiency can typically only be achieved over a small part of the engine's range of operating speed.
127:, the term deriving from the fact that it is generated by the resistance of the column, and exerts its influence backwards on the pump that must supply the flow. Back-pressure is a useful diagnostic feature of problems with the chromatography column. Rapid chromatography is favoured by columns packed with very small particles, which create high back-pressures. Column designers use "kinetic plots" to show the performance of a column at a constant back-pressure, usually selected as the maximum that a system's pump can reliably produce.
61:
291:"Effects of valve timing, valve lift and exhaust backpressure on performance and gas exchanging of a two-stroke GDI engine with overhead valves"
64:
Two similar pipings with same pressure distance and head. The second pipe contains some obstructions for flow resulting in less discharge.
124:
44:) is the term for a resistance to the desired flow of fluid through pipes. Obstructions or tight bends create backpressure via
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Back pressure is the term used for the hydraulic pressure required to create a flow through a
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168:"CFD analysis of Back Pressure due to bend in exhaust Pipe of 4 stoke petrol engine"
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Dalla Nora, Macklini; Lanzanova, Thompson Diórdinis Metzka; Zhao, Hua (2016).
385:
223:"The influence of exhaust backpressure upon the turbochargers boost pressure"
49:
45:
221:
Kocsis, Levente-Botond; Moldovanu, Dan; Baldean, Doru-Laurean (2015).
275:
81:
60:
194:
The effect of back pressure on the operation of a diesel engine
227:
Proceedings of the
European Automotive Congress EAEC-ESFA 2015
166:
Shekhar, Ravi; Singh Dhugga, Paramvir; Malik, Kashish (2016).
165:
288:
68:
A common example of backpressure is that caused by the
220:
325:"Column Pressure Considerations in Analytical HPLC"
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27:Force opposing the flow of fluid through pipes
257:Design and Simulation of Two-Stroke Engines
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14:
384:
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125:high-performance liquid chromatography
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201:Defence Science and Technology Group
210:from the original on June 24, 2021.
100:output that must be compensated by
24:
25:
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231:Springer International Publishing
92:, which has a negative effect on
298:Energy Conversion and Management
137:Exhaust pulse pressure charging
30:For the routing algorithm, see
310:10.1016/j.enconman.2016.05.059
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96:, resulting in a decrease of
407:Two-stroke engine technology
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102:increasing fuel consumption
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423:
29:
356:"Kinetic Plots Made Easy"
323:Majors, Ronald E (2007).
175:Int. J. Aerosp. Mech. Eng
254:Blair, Gordon (1996).
65:
354:Neue, Uwe D. (2009).
192:Hield, Peter (2011).
121:chromatography column
115:Liquid chromatography
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233:. pp. 367–374.
32:backpressure routing
278:on 25 October 2012.
107:In a piston-ported
88:) of an automotive
78:catalytic converter
72:(consisting of the
360:LCGC North America
329:LCGC North America
90:four-stroke engine
66:
392:Engine technology
271:978-1-56091-685-7
262:SAE International
142:Expansion chamber
109:two-stroke engine
94:engine efficiency
16:(Redirected from
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335:(11): 1074–1092
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147:Scalar quantity
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70:exhaust system
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366:(11): 974–983
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50:pressure drop
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46:friction loss
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38:Back pressure
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368:. Retrieved
363:
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337:. Retrieved
332:
328:
318:
301:
297:
284:
276:the original
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118:
106:
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42:backpressure
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37:
36:
18:Backpressure
56:Explanation
386:Categories
199:(Report).
153:References
304:: 71–83.
181:(4): 1–3.
397:Pressure
370:10 March
339:10 March
205:Archived
131:See also
82:muffler
402:Piping
268:
237:
294:(PDF)
208:(PDF)
197:(PDF)
171:(PDF)
98:power
86:pipes
372:2022
341:2022
266:ISBN
235:ISBN
48:and
40:(or
306:doi
302:123
123:in
388::
364:27
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104:.
80:,
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52:.
374:.
343:.
312:.
308::
243:.
179:3
34:.
20:)
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