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TECHNICAL PAPERS: Internal Combustion Engines

Prediction of Peak Cylinder Pressure Variations Over Varying Inlet Air Condition of Compression-Ignition Engine

[+] Author and Article Information
Gong Chen

Department of Mechanical Engineering, Gannon University, Erie, PA 16541

J. Eng. Gas Turbines Power 129(2), 589-595 (Aug 15, 2006) (7 pages) doi:10.1115/1.2431389 History: Received September 30, 2005; Revised August 15, 2006

Peak cylinder pressure (pmax) of a compression-ignition engine can be affected by the engine inlet air condition, such as its inlet air temperature (Ti) and pressure (pi). The variation of peak cylinder pressure due to varying inlet air temperature or pressure is analytically studied. A model is developed and simplified, and thus the variations of pmax can be predicted along with varying inlet air temperature or pressure. The analysis and prediction indicate that cylinder active compression ratio (CR) and intake air boost ratio (pm0pi0) play relatively significant roles in affecting the variation of pmax over inlet air temperature and pressure, and the pressure variation is proportional to CRk and ratio pm0pi0. Comparison between the predicted results using the simplified model and those from engine experiments shows a close agreement in both the trend and magnitude. The investigation and prediction also include modeling the variation in pmax due to varying the cylinder TDC clearance volume (Vc). The simplified model is presented and shows that the change in pmax versus varying Vc also depends on the cylinder compression ratio. It is indicated that for a certain change in the clearance volume, a higher compression-ratio configuration would produce a greater change in pmax than a lower one does, especially as the rest of the engine design and operating parameters remain unchanged.

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Copyright © 2007 by American Society of Mechanical Engineers
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References

Figures

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Figure 5

Predicted change in pmax versus intake air boost ratio at various inlet air temperature (k=1.32, n=0.8, CR=15)

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Figure 7

Predicted rate of variation of pmax over inlet air pressure at various compression ratio (k=1.32, m=0.4, pm0∕pi0=3.2)

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Figure 8

Predicted change in pmax versus inlet air pressure at various compression ratio (k=1.32, m=0.4, pm0∕pi0=3.2)

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Figure 9

Predicted change in pmax over air boost ratio and inlet air pressure (k=1.32, m=0.4, CR=15)

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Figure 10

Predicted and measured change in pmax versus inlet air pressure of engine

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Figure 11

Predicted variation of pmax over cylinder TDC volume at various compression ratio

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Figure 1

Illustration of peak cylinder pressure

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Figure 2

Comparison of predicted Δpmax between using model and simplified model (k=1.32, n=0.8, CR=15, pm0=0.32MPa)

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Figure 3

Predicted pmax-variation rate over inlet air temperature at various compression ratio (k=1.32, n=0.8)

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Figure 4

Predicted Δpmax∕pm0 versus inlet air temperature at various compression ratio (k=1.32, n=0.8)

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Figure 6

Predicted and measured change in pmax versus inlet air temperature of engine

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