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Research Papers: Gas Turbines: Combustion, Fuels, and Emissions

Numerical Investigation of the Effect of Knock on Heat Transfer in a Turbocharged Spark Ignition Engine

[+] Author and Article Information
Arman Rostampour

Department of Automotive Engineering,
Iran University of Science and Technology,
Tehran 1651114833, Iran
e-mail: arostampour@auto.iust.ac.ir

Ali Nassiri Toosi

Assistant Professor
Department of Automotive Engineering,
Iran University of Science and Technology,
Tehran 1684613114, Iran
e-mail: anasiri@iust.ac.ir

1Corresponding author.

Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received March 16, 2015; final manuscript received April 25, 2015; published online June 2, 2015. Editor: David Wisler.

J. Eng. Gas Turbines Power 137(12), 121502 (Jun 02, 2015) (8 pages) Paper No: GTP-15-1094; doi: 10.1115/1.4030517 History: Received March 16, 2015

This investigation deals with the EF7 (TC) engine, a dual fuel engine equipped with a turbocharger system, consequently with a high probability of knock inception. In this study, an operating cycle of the engine was simulated using KIVA-3V code. Some modifications were carried out on the KIVA method of calculating pressure in the intake port in order to simulate turbocharger pressure correctly. Auto-ignition and knock were then simulated using the auto-ignition integral model. The modified code and the simulation were verified using three different methods; in-cylinder average pressure, gas temperature of the exhaust port, and auto-ignition timing. The simulation results using the auto-ignition integral model, as compared with the experimental data, proved to be reasonably accurate. Following this validation, the effect of the knock phenomenon on the engine heat transfer through the walls was investigated. The simulations showed that the rate of heat transfer through the walls under knocking conditions is about 2.2 times higher than that under normal conditions. However, it was also shown that the total heat transfer increases about 15%.

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References

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Figures

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Fig. 1

Computational grid at BDC for EF7 (TC)

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Fig. 2

Grid independency test for EF7 (TC)

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Fig. 3

Validation of simulation results using in-cylinder pressure at 5500 rpm (nonknocking)

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Fig. 4

Validation of simulation results using in-cylinder pressure at 5500 rpm (knocking)

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Fig. 5

Comparison of average in-cylinder pressure at 5500 rpm within combustion period

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Fig. 6

Location of exhaust gas temperature measurement

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Fig. 7

Simulated temperature of exhaust port gas at 5500 rpm for the point shown in Fig. 6 (knocking)

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Fig. 8

Flame propagation map

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Fig. 9

The creation of a second flame front near the exhaust valve

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Fig. 10

Comparison of average in-cylinder pressure under knocking and nonknocking conditions

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Fig. 11

Comparison of rate of heat transfer under knocking and normal conditions

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Fig. 12

Comparison of cumulative heat transfer under knocking and nonknocking conditions

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Fig. 13

Comparison of the rate of heat release under knocking and nonknocking conditions

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Fig. 14

Comparison of cumulative heat release under knocking and nonknocking conditions

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Fig. 15

Comparison of average temperature of combustion chamber under knocking and nonknocking conditions

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