scholarly journals Trends in the development of turbocharging systems in automotive vehicles

2008 ◽  
Vol 133 (2) ◽  
pp. 61-76
Author(s):  
Krzysztof DANILECKI
Keyword(s):  
Single Stage ◽  
Compression Ignition ◽  
Two Stage ◽  
Compression Ignition Engines ◽  
Further Development

The application of turbocharging systems results in serious problems related to the delivery of appropriate amount of air needed to entirely burn the supplied dose of fuel. This problem is particularly relevant for non-adjustable turbocharging systems (constant geometry turbines). The improvements of the turbocharging systems in compression ignition engines may be implemented through such solutions as two stage or sequential turbocharging that show significant benefits as opposed to a single stage variable turbocharger geometry (VGT) turbocharging. The paper presents adjustable two stage turbocharging and sequential turbocharging finding application in serially manufactured vehicles. The assessment of the properties of these solutions and attempts to describe the trends in the further development of the turbocharging systems have been made. With this background, the results of own research of the author have been presented performed on a SW 680 sequentially turbocharged engine.

METHODOLOGIES FOR MEASURING SPECIFIC CONSUMPTION FUE IN COMPRESSION IGNITION ENGINES

2018 ◽  
Author(s):  
luany braga ◽  
ANTONILSON CONCEIÇÃO ◽  
Hendrick Zarate Rocha ◽  
Danielle R S Guerra ◽  
Manoel Nogueira
Keyword(s):  
Specific Consumption ◽  
Compression Ignition ◽  
Compression Ignition Engines

The anaerobic treatment of a ligno-cellulosic substrate offering little natural pH buffering capacity

1998 ◽  
Vol 38 (4-5) ◽  
pp. 29-35 ◽  
Author(s):  
C. J. Banks ◽  
P. N. Humphreys
Keyword(s):  
Ph Control ◽  
Anaerobic Treatment ◽  
Buffering Capacity ◽  
Single Stage ◽  
Stable Operation ◽  
Reactor Performance ◽  
Two Stage ◽  
Ph Buffering ◽  
Stage System ◽  
The Stability

The stability and operational performance of single stage digestion with and without liquor recycle and two stage digestion were assessed using a mixture of paper and wood as the digestion substrate. Attempts to maintain stable digestion in both single stage reactors were unsuccessful due to the inherently low natural buffering capacity exhibited; this resulted in a rapid souring of the reactor due to unbuffered volatile fatty acid (VFA) accumulation. The use of lime to control pH was unsatisfactory due to interference with the carbonate/bicarbonate equilibrium resulting in wide oscillations in the control parameter. The two stage system overcame the pH stability problems allowing stable operation for a period of 200 days without any requirement for pH control; this was attributed to the rapid flushing of VFA from the first stage reactor into the second stage, where efficient conversion to methane was established. Reactor performance was judged to be satisfactory with the breakdown of 53% of influent volatile solids. It was concluded that the reactor configuration of the two stage system offers the potential for the treatment of cellulosic wastes with a sub-optimal carbon to nitrogen ratio for conventional digestion.

Numerical assessment on the performance of variable area single- and two-stage ejectors: A comparative study

2021 ◽  
pp. 095440892110331
Author(s):  
Anil Kumar ◽  
Virendra Kumar ◽  
PMV Subbarao ◽  
Surendra K Yadav ◽  
Gaurav Singhal
Keyword(s):  
Change Theory ◽  
Single Stage ◽  
Two Stage ◽  
Entrainment Ratio ◽  
Ansys Fluent ◽  
One Dimensional ◽  
Flow Parameters ◽  
Constant Rate ◽  
Numerical Assessment ◽  
The One

The two-stage ejector has been suggested to replace the single-stage ejector geometrical configuration better to utilize the discharge flow’s redundant momentum to induce secondary flow. In this study, the one-dimensional gas dynamic constant rate of momentum change theory has been utilized to model a two-stage ejector along with a single-stage ejector. The proposed theory has been utilized in the computation of geometry and flow parameters of both the ejectors. The commercial computational fluid dynamics tool ANSYS-Fluent 14.0 has been utilized to predict performance and visualize the flow. The performance in terms of entrainment ratio has been compared under on- design and off-design conditions. The result shows that the two-stage ejector configuration has improved (≈57%) entrainment capacity than the single-stage ejector under the on-design condition.

Multi-Dimensional Modeling of Combustion in Compression Ignition Engines Operating with Variable Charge Premixing Levels

2011 ◽  
Author(s):  
Maya Briani ◽  
Valentina Fraioli ◽  
Marianna Migliaccio ◽  
Gabriele Di Blasio ◽  
Tommaso Lucchini ◽  
...  
Keyword(s):  
Compression Ignition ◽  
Variable Charge ◽  
Compression Ignition Engines ◽  
Dimensional Modeling
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