Compressed Air in Engine Exhaust Manifold to Improve Engine Performance and Fuel Economy

2019 ◽  
Author(s):  
Jyotirmoy Barman ◽  
Kumar Patchappalam ◽  
Himanshu Gambhir
Keyword(s):  
Fuel Economy ◽  
Engine Performance ◽  
Compressed Air ◽  
Exhaust Manifold ◽  
Engine Exhaust

scholarly journals Analysis of exhaust manifold to improve the engine performance

2018 ◽  
Vol 7 (2.8) ◽  
pp. 539 ◽  
Author(s):  
C Krishnara J ◽  
S Rajesh Ruban ◽  
N Subramani
Keyword(s):  
Thermal Analysis ◽  
Engine Performance ◽  
Volumetric Efficiency ◽  
Exhaust Manifold ◽  
Cfd Simulations ◽  
Engine Exhaust

The aim of the work is to analyze the performance of the engine exhaust manifold. Because the engine exhaust manifold is a significant factor in the engine performance. In this work the manifold design is prepared with the help of CAD software and it is analyzed by the ANSYS. This CFD and thermal analysis also done to check the performance of the redesigned exhaust manifold. The aim of CFD simulations performed to investigate the volumetric efficiency behaviour of an exhaust.

Energy Availability Study for a Regenerative Hydraulically Assisted Turbocharger

2018 ◽  
Author(s):  
Tao Zeng ◽  
Yifan Men ◽  
Devesh Upadhyay ◽  
Guoming Zhu
Keyword(s):  
Diesel Engine ◽  
Fuel Economy ◽  
Energy Recovery ◽  
Performance Enhancement ◽  
Engine Performance ◽  
Energy Availability ◽  
Engine Exhaust ◽  
Performance And Emissions ◽  
Exhaust Energy ◽  
Engine Performance And Emissions

Engine downsizing and down-speeding are essential to meet future US fuel economy mandates. While turbocharging has been a critical enabler for downsizing, transient boost response performance remains a concern even with variable geometry turbochargers. This slow build-up of boost and hence torque is commonly referred to as turbo-lag. Mitigation of turbo-lag has, therefore, remained an important objective of turbocharger performance enhancement research. A regenerative, hydraulically assisted turbocharger is one such enhanced turbocharging system that is able regulate the turbocharger speed independent of the available engine exhaust energy. With external power available on the turbocharger shaft, the engine performance and emissions can be managed during both transient and steady-state operations. The key to fully utilizing the ability of such an assisted turbocharger depends on the energy recovered from turbocharger shaft and/or vehicle driveline. Energy available from the turbocharger shaft is dependent on the engine exhaust gas energy. Energy recovered from the driveline depends on vehicle braking energy. A previously developed high-fidelity 1-D simulation of a diesel engine with a regenerative-hydraulically assisted turbocharger is used to investigate the energy availability for a medium duty diesel engine over standard driving cycles. The study shows that the energy recovery from turbocharger shaft is limited and driveline energy recovery is necessary for achieving fuel economy benefits on the order of 4%.

Economy and emission characteristics of the optimal dilution strategy in lean combustion based on GDI gasoline engine equipped with prechamber

2021 ◽  
Vol 13 (12) ◽  
pp. 168781402110381
Author(s):  
Li Wang ◽  
Zhaoming Huang ◽  
Wang Tao ◽  
Kai Shen ◽  
Weiguo Chen
Keyword(s):  
Fuel Economy ◽  
Gasoline Engine ◽  
Direct Injection ◽  
Engine Performance ◽  
Gasoline Direct Injection ◽  
Dilution Ratio ◽  
Lean Combustion ◽  
Excess Air ◽  
Combustion Phase ◽  
Hc Emissions

EGR and excess-air dilution have been investigated in a 1.5 L four cylinders gasoline direct injection (GDI) turbocharged engine equipped with prechamber. The influences of the two different dilution technologies on the engine performance are explored. The results show that at 2400 rpm and 12 bar, EGR dilution can adopt more aggressive ignition advanced angle to achieve optimal combustion phasing. However, excess-air dilution has greater fuel economy than that of EGR dilution owing to larger in-cylinder polytropic exponent. As for prechamber, when dilution ratio is greater than 37.1%, the combustion phase is advanced, resulting in fuel economy improving. Meanwhile, only when the dilution ratio is under 36.2%, the HC emissions of excess-air dilution are lower than the original engine. With the increase of dilution ratio, the CO emissions decrease continuously. The NOX emissions of both dilution technologies are 11% of those of the original engine. Excess-air dilution has better fuel economy and very low CO emissions. EGR dilution can effectively reduce NOX emissions, but increase HC emissions. Compared with spark plug ignition, the pre chamber ignition has lower HC, CO emissions, and higher NO emissions. At part load, the pre-chamber ignition reduces NOX emissions to 49 ppm.

Performance Investigation of a Four Stroke Diesel Engine, Using Water-Based Ferrofluid as an Additive

2011 ◽  
Author(s):  
F. Daneshvar ◽  
N. Jahani ◽  
M. B. Shafii
Keyword(s):  
Experimental Study ◽  
Magnetic Nanoparticles ◽  
Diesel Engine ◽  
Diesel Fuel ◽  
Engine Performance ◽  
Brake Specific Fuel Consumption ◽  
Engine Exhaust ◽  
Brake Thermal Efficiency ◽  
Diesel Fuels ◽  
Water Based

In this experimental study, a four stroke diesel engine was conducted to investigate the effect of adding water-based ferrofluid to diesel fuel on engine performance. To our knowledge, Magnetic nanoparticles had not been used before. To this end, emulsified diesel fuels of 0, 0.4, and 0.8 water-based ferrofluid/Diesel ratios by volume were used as fuel. The ferrofluid used in this study was a handmade water-based ferrofluid prepared by the authors. The results show that adding water-based ferrofluid to diesel fuel has a perceptible effect on engine performance, increasing the brake thermal efficiency relatively up to 12%, and decreasing the brake specific fuel consumption relatively up to 11% as compared to diesel fuel. In addition, the results indicate that increasing ferrofluid concentration will magnify the results. Furthermore, it was found that magnetic nanoparticles can be collected at the engine exhaust using magnetic bar.

scholarly journals Review of Performance and Emmissions Characteristics of Bio-Additive Fuel on SI Engine Fuelled by Biopetrol

2015 ◽  
Vol 773-774 ◽  
pp. 430-434
Author(s):  
Azizul Mokhtar ◽  
Nazrul Atan ◽  
Najib Rahman ◽  
Amir Khalid
Keyword(s):  
Fuel Economy ◽  
Fossil Fuels ◽  
Review Paper ◽  
Engine Performance ◽  
Exhaust Emissions ◽  
Spark Ignition Engine ◽  
Si Engine ◽  
New Approach ◽  
Performance And Emission ◽  
Performance And Emissions

Bio-additive is biodegradable and produces less air pollution thus significant for replacing the limited fossil fuels and reducing threats to the environment from exhaust emissions and global warming. Instead, the bio-additives can remarkably improve the fuel economy SI engine while operating on all kinds of fuel. Some of the bio-additive has the ability to reduce the total CO2 emission from internal petrol engine. This review paper focuses to determine a new approach in potential of bio-additives blends operating with bio-petrol on performance and emissions of spark ignition engine. It is shown that the variant in bio-additives blending ratio and engine operational condition are reduced engine-out emissions and increased efficiency. It seems that the bio-additives can increase the maximum cylinder combustion pressure, improve exhaust emissions and largely reduce the friction coefficient. The review concludes that the additives usage in bio-petrol is inseparable for the better engine performance and emission control and further research is needed to develop bio-petrol specific additives.

scholarly journals Virtual Calibration Method for Diesel Engine by Software in The Loop Techniques

2019 ◽  
Vol 16 (3) ◽  
pp. 6940-6957
Author(s):  
M. C. Cameretti ◽  
E. Landolfi ◽  
T. Tesone ◽  
A. Caraceni
Keyword(s):  
Diesel Engine ◽  
Fuel Economy ◽  
Engine Performance ◽  
Control Unit ◽  
Calibration Method ◽  
Pollutant Emissions ◽  
Engine Control ◽  
Start Of Injection ◽  
Definition Of ◽  
Valid Solution

The calibration of the engine control unit is increased for the development of the whole automotive system. The aim is to calibrate the electronic engine control to match the decreasing emission requirements and increasing fuel economy demands. The reduction of the number of tests on vehicles represents one of the most important requirements for increasing efficiency of the engine calibration process. However, the definition of the design of experiment is not straightforward because the data is not known beforehand, so it is difficult to process and analyse this data to achieve a globally valid model. To reduce time effort and costs the virtual calibration can be a valid solution. This procedure is called software in the loop (SIL) calibration able to develop a process to systematically identify the optimal balance of engine performance, emissions and fuel economy. In this work, a virtual calibration methodology is presented by using a two-stage model to get minimum exhaust emissions of a diesel engine. The data used are from a GT-Power model of a 3L supercharged diesel engine. The model is able to calculate the engine emissions for different engine parameters (such as the start of injection, EGR fraction and rail pressure) and from optimisation process, new injection start maps that reduce pollutant emissions are created.

scholarly journals Impact of compressed air energy storage demands on gas turbine performance

2020 ◽  
pp. 095765092090627 ◽  
Author(s):  
Uyioghosa Igie ◽  
Marco Abbondanza ◽  
Artur Szymański ◽  
Theoklis Nikolaidis
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Pressure Ratio ◽  
Engine Performance ◽  
Compressed Air ◽  
Design Stage ◽  
Simulation Code ◽  
Ratio Distribution ◽  
Stall Margin ◽  
Industrial Gas Turbines

Industrial gas turbines are now required to operate more flexibly as a result of incentives and priorities given to renewable forms of energy. This study considers the extraction of compressed air from the gas turbine; it is implemented to store heat energy at periods of a surplus power supply and the reinjection at peak demand. Using an in-house engine performance simulation code, extractions and injections are investigated for a range of flows and for varied rear stage bleeding locations. Inter-stage bleeding is seen to unload the stage of extraction towards choke, while loading the subsequent stages, pushing them towards stall. Extracting after the last stage is shown to be appropriate for a wider range of flows: up to 15% of the compressor inlet flow. Injecting in this location at high flows pushes the closest stage towards stall. The same effect is observed in all the stages but to a lesser magnitude. Up to 17.5% injection seems allowable before compressor stalls; however, a more conservative estimate is expected with higher fidelity models. The study also shows an increase in performance with a rise in flow injection. Varying the design stage pressure ratio distribution brought about an improvement in the stall margin utilized, only for high extraction.

Ceramics for Transportation Engines—Siren or Solution

1989 ◽  
Vol 42 (3) ◽  
pp. 53-69 ◽  
Author(s):  
Phillip S. Myers
Keyword(s):  
Fuel Economy ◽  
Molecular Level ◽  
Engine Performance ◽  
Volumetric Efficiency ◽  
New Materials ◽  
Heat Rejection ◽  
Properties Of Materials ◽  
Relationship Of ◽  
The Relationship

The major challenges facing transportation engines—shrinking resources, preserving the environment, and competition—are reviewed and the promise of new materials, specifically ceramics, in helping to meet these challenges is discussed. As a background for understanding the properties of materials, the structure of materials (first at the subatomic level, then the molecular level, and finally at the mircostructure level) is reviewed. The relationship of this structure to properties of ceramics judged to be of importance to engines is then presented. The effect of these properties on engine performance such as volumetric efficiency, fuel economy, heat rejection, inertia, friction, wear, fuel tolerance, and packaging are discussed. It is concluded that ceramics have special properties that, for selected applications, are already justifying their use in transportation engines. It is further concluded that these special application uses will continue to grow and precede general use of ceramics for in-cylinder insulation aimed at improving fuel economy.

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