Experimental and Simulation Study to Optimize the Venturi Throat Diameter for Effective Use of EGR Rate to Achieve BSIV

Rajput, Karan; Barman, Jyotirmoy; Goswami, Angshuman; Lakhlani, Hardik

doi:10.4271/2013-01-2739

Cited by 3 publications

(1 citation statement)

References 11 publications

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“…EGR technology [6,[12][13][14][15], is namely, recirculating the cooled exhaust gas back into the combustion chamber. On the one hand, the heat capacity of the in-cylinder charge is improved, so the flame temperature can be reduced at the inlet CO2 and water vapor; on the other hand, NOx formation is effectively restrained by reducing the inlet concentration of O2, slowing down the mixing speed of air and fuel, and obtaining a lower flame temperature.…”

Section: Figurementioning

confidence: 99%

A Numerical Study on Combustion and Emission Characteristics of a Medium-Speed Diesel Engine Using In-Cylinder Cleaning Technologies

Feng

et al. 2015

Energies

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Abstract:In order to clarify the potential of internal purification methods on medium speed diesel engines to meet the IMO Tier III nitrogen oxide (NOx) emission regulations, combined 1-D engine working cycle simulation and 3-D CFD simulation were conducted to predict the performance and emissions of the engine under different valve close timings, geometric compression ratios, injection timings, and Exhaust Gas Recirculation (EGR) rates. The numerical results show that, as the inlet valve close timing is advanced, NOx is reduced by as much as 27%, but the peak of premixed combustion heat release rate is increased; this can weaken the ability to reduce NOx with the Miller cycle. Moreover, the peak of premixed combustion heat release rate is reduced when the geometric compression ratio is increased to 15.4, and linking with injection timing by delaying 6°CA can further reduce NOx by 55.3% from the baseline. Finally, over 80% NOx reduction can be achieved when the above schemes are combined with over 15% EGR. The NOx and soot can be reduced simultaneously by using moderate Miller cycle combination with moderate EGR, and the results show a large reduction of NOx and moderate reduction of soot. This can be a feasible technical solution to meet Tier III regulations.

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Section: Figurementioning

confidence: 99%

A Numerical Study on Combustion and Emission Characteristics of a Medium-Speed Diesel Engine Using In-Cylinder Cleaning Technologies

Feng

et al. 2015

Energies

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Optimum design for intake and exhaust system of a heavy-duty diesel engine by using DFSS methodology

Wang¹

2018

J Mech Sci Technol

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3-Dimensional Numerical Simulation and Research on Internal Flow about Different EGR Rates in Venturi Tube of EGR System for a Turbocharged Diesel Engine

Yang,

Yan,

Liu

et al. 2024

SAE Technical Paper Series

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<div class="section abstract"><div class="htmlview paragraph">Exhaust gas recirculation technology is one of the main methods to reduce engine emissions. The pressure of the intake pipe of turbocharged direct-injection diesel engine is high, and it is difficult to realize EGR technology. The application of Venturi tube can easily solve this problem. In this paper, the working principle of guide-injection Venturi tube is introduced, the EGR system and structure of a turbocharged diesel engine using the guide-injection Venturi tube are studied. According to the working principle of EGR system of turbocharged diesel engine, the model of guide-injection Venturi tube is established, the calculation grid is divided, and it is carried out by using Computational Fluid Dynamics method that the three-dimensional numerical simulation of the internal flow of Venturi tube under different EGR rates injection. The flow field state, velocity field, pressure field and exhaust gas concentration parameters of the mixture formed by air and EGR exhaust gas in Venturi tube are analyzed. The calculation results show that the EGR rate has a great impact on the initial pressure recovery effect before the compression section of the Venturi tube. The greater the EGR rate ejection amount, the worse the pressure recovery effect. In order to meet the requirement of large EGR rate, the Venturi diffuser angle should be reduced while keeping the length of the diffuser section unchanged. The diameter of the throat of the mixing section and the diameter of the EGR ejection port can be appropriately increased, the number of ejection ports can also be appropriately increased. This paper also proves that the Venturi tube of the ejector EGR system can overcome the pressure deficit between the exhaust pipe and the intake pipe of the turbocharged direct-injection diesel engine, which verifies the feasibility of the EGR Technology of the turbocharged direct-injection diesel engine through the Venturi tube.</div></div>

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Experimental and Simulation Study to Optimize the Venturi Throat Diameter for Effective Use of EGR Rate to Achieve BSIV

Cited by 3 publications

References 11 publications

A Numerical Study on Combustion and Emission Characteristics of a Medium-Speed Diesel Engine Using In-Cylinder Cleaning Technologies

A Numerical Study on Combustion and Emission Characteristics of a Medium-Speed Diesel Engine Using In-Cylinder Cleaning Technologies

Optimum design for intake and exhaust system of a heavy-duty diesel engine by using DFSS methodology

3-Dimensional Numerical Simulation and Research on Internal Flow about Different EGR Rates in Venturi Tube of EGR System for a Turbocharged Diesel Engine

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