A New Hardware-Assisted Inlet Port Development Process for Diesel Engines Using Doppler Global Velocimetry

Zuelch, Stefan; Behnk, Kai; Deepe, Roland; Findeisen, Bernd; Seidel, Thomas; Stiegler, Lutz; Sommer, Ansgar

doi:10.4271/2005-01-0640

Cited by 8 publications

(2 citation statements)

References 2 publications

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“…However at low speed swirl levels can fall, and if additional swirl is required (to obtain enough fuel-air mixing for emissions control for example) another technique must be employed to generate the extra swirl. Zuelch et al have described the areas of a diesel engine operating map that most benefit from swirl [4]. Herzog [5] reported that by deactivating one inlet valve in a 1998 engine the NO x -soot tradeoff was significantly improved at low engine speed and light load due to the increase in swirl.…”

Section: Introductionmentioning

confidence: 99%

Comparing the Effect of a Swirl Flap and Asymmetric Inlet Valve Opening on a Light Duty Diesel Engine

Leach

Davy

Weall

et al. 2017

SAE Technical Paper Series

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Diesel engine designers often use swirl flaps to increase air motion in cylinder at low engine speeds, where lower piston velocities reduce natural in-cylinder swirl. Such in-cylinder motion reduces smoke and CO emissions by improved fuel-air mixing. However, swirl flaps, acting like a throttle on a gasoline engine, create an additional pressure drop in the inlet manifold and thereby increase pumping work and fuel consumption. In addition, by increasing the fuel-air mixing in cylinder the combustion duration is shortened and the combustion temperature is increased; this has the effect of increasing NO x emissions. Typically, EGR rates are correspondingly increased to mitigate this effect. Late inlet valve closure, which reduces an engine's effective compression ratio, has been shown to provide an alternative method of reducing NO x emissions. Recently introduced technologies combine these two effects by retarding only the swirl port valve, increasing in-cylinder swirl while simultaneously reducing the effective compression ratio.In this paper the effects of using a swirl flap and offset cams are compared. Four different swirl flap positions (ranging from fully open to fully closed) were investigated using standard cams and valve timings. Results were compared with the engine's operation when using two offset cams providing two different levels of retard on the swirl port-30 and 60 crank angle degrees (CAD) respectively. Engine emissions, fuel consumption, and combustion parameters were measured and compared in order to elucidate the effects of phased cam operation.The results show that the use of a cam retarding the opening of the swirl port can reduce NO x emissions at certain speed/load conditions without adversely affecting other emissions. In addition significantly retarding the swirl port closure can reduce FSN emissions to near zero with low NO x emissions, by a combination of high levels of swirl and a reduced effective compression ratio.

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Section: Introductionmentioning

confidence: 99%

Comparing the Effect of a Swirl Flap and Asymmetric Inlet Valve Opening on a Light Duty Diesel Engine

Leach

Davy

Weall

et al. 2017

SAE Technical Paper Series

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“…The researches [2][3][4][5][6][7][8] have shown that helical type intake-port will be ideal for the engine with nominal injection pressure value less than 800 bar and having single orifice injector.…”

Section: Introductionmentioning

confidence: 99%

Design and Analysis of Intake Port of Diesel Engine for Target Value of Swirl

Sabale¹,

Sanap²

2013

AJME

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The mutual desire for higher fuel economy and greater performance along with stringent emission regulations set by the government for diesel engines necessitates enhanced air-fuel mixing for proper combustion. The design of intake port plays a major role in an engine design, development and optimization, as it controls the power developed, fuel consumed and exhaust emissions from the engine. The effects of different geometrical parameters of helical port on swirl performance were studied. A methodology is proposed for the design of helical inlet port of diesel engine in order to achieve target value of 1.8 swirl number. The computational fluid dynamics approach is used for analysis of intake port performance. The port performance of prototype flow box was analyzed experimentally on a steady flow rig. The observed mean swirl number and flow capacity values satisfy the requirements.

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