A Regenerative Flow Compressor as a Secondary Air Pump for Engine Emission Control

2010 ◽  
Author(s):  
Abraham Engeda
Keyword(s):  
Exhaust System ◽  
Injection System ◽  
Automotive Engine ◽  
Rich Mixture ◽  
Unburned Hydrocarbons ◽  
Secondary Air ◽  
Flow Compressor ◽  
Regenerative Flow ◽  
Cold Starts ◽  
Engine Emission

The automotive engine requires a relatively rich mixture of fuel and air for smooth operation on cold start. Exhaust gases contain high levels of carbon monoxide and hydrocarbons after cold starts. The unburned hydrocarbons could be further oxidized, except there is no oxygen left after combustion. Using a Secondary Air Pump (SAP), air is fed into the exhaust manifold (secondary air), the CO and HC are oxidized through afterburning at temperatures over 600°C to form water and carbon dioxide. An activated secondary air injection system leads to an increase in oxygen content in the exhaust system. This paper discuses the performance of a Regenerative Flow Compressor (RFC) for SAP application and shows the RFC to be the best choice for satisfying the required specification of the SAP.

A regenerative flow compressor as a secondary air pump for engine emission control

2008 ◽  
Vol 222 (9) ◽  
pp. 1707-1715 ◽  
Author(s):  
A Engeda ◽  
Y Elkacimi
Keyword(s):  
Emission Control ◽  
Exhaust System ◽  
Control Device ◽  
Automotive Engine ◽  
Positive Displacement ◽  
Computational Fluid Dynamics Analysis ◽  
Secondary Air ◽  
Flow Compressor ◽  
Regenerative Flow ◽  
Engine Emission

A secondary air pump (SAP) is an air compressor that supplies air to the exhaust system of an automotive engine for the emission control of the engine. The SAP system has been offered as an emission control device in later versions of cars, starting in the mid-1990s. Various types of rotary and positive displacement air pumps have been tested and used for SAP application. The regenerative flow compressor/pump (RFC or RFP) and the centrifugal compressor have been found to be best suited for SAP application. This paper discusses the performance of an RFC for SAP application and shows the RFC to be the best choice for satisfying the required specifications of the SAP. Computational fluid dynamics analysis of the RFC for an SAP application was carried out to study its performance in detail.

Scavenging of Two Stroke Petrol Engine by Using Secondary Air Injection System

2019 ◽  
pp. 913-922
Author(s):  
Sagar Namdev Khurd ◽  
U. B. Andh ◽  
S. V. Kulkarni ◽  
Sandeep S. Wangikar ◽  
P. P. Kulkarni
Keyword(s):  
Air Injection ◽  
Petrol Engine ◽  
Injection System ◽  
Secondary Air Injection ◽  
Secondary Air

scholarly journals ANALISA CAMPURAN METANOL–PERTALITE TERHADAP KINERJA DAN SUHU KERJA MOTOR

2020 ◽  
Vol 3 (01) ◽  
pp. 27-34
Author(s):  
Sugeng Hadi Susilo ◽  
M. Fanny Suharono ◽  
Hari Rarindo ◽  
Hangga Wicaksono
Keyword(s):  
Experimental Method ◽  
Exhaust System ◽  
Injection System ◽  
Lower Power ◽  
Gasoline Engines ◽  
Working Temperature ◽  
Methanol Mixture

The study aims to determine the effect of using a mixture of methanol add on to pertalite to the performance of gasoline engines, especially injection system with a capacity of 250 cc engine with two cylinders. This research used experimental method with variables used in this research is mixture of pure pertalite (P), mixture of pertalite - methanol 90% - 10% (PM1), mixture of pertalite - methanol 80% - 20% (PM2), mixture of pertalite - methanol 70% - 30% (PM3), mixed pertalite - methanol 60% - 40% (PM4), 50% - 50% (PM5) pertalite - methanol mixtures, pertalite - methanol 40% - 60% (PM6). Variable related in this research is power, torque and working temperature of the engine. The results of this study indicate that the addition of methanol with pertalite fuel tends to produce lower power and torque, while the temperature of the radiator and exhaust system shows that the use of methanol mixture with pertalite fuel can significantly increase the engine temperature of the vehicle.

Preliminary Study of Fuel Injector Monitoring System by I-KazTM Multilevel Analysis

2013 ◽  
Vol 471 ◽  
pp. 229-234
Author(s):  
Zailan Karim ◽  
M.A. Jusoh ◽  
A.R. Bahari ◽  
Mohd Zaki Nuawi ◽  
Jaharah Abd. Ghani ◽  
...  
Keyword(s):  
Monitoring System ◽  
Single Channel ◽  
Injection System ◽  
Fuel Injector ◽  
Monitoring Method ◽  
Engine Operation ◽  
Automotive Engine ◽  
Actual Operation ◽  
Pressure Bar ◽  
The Relationship

Fuel injector in automotive engine is a very important component in injecting the correct amount of fuel into the combustion chamber. The injection system need to be in a very safe and optimum condition during the engine operation. The mulfunction of the injection system can be avoided if the current working condition is known and a proper maintenence procedure is implemented. This paper proposes the development of a fuel injector monitoring method using strain signals captured by a single-channel strain gage attached on the fuel injector body. The fuel injector was operated under three main sets of parameters; pulse width (ms), frequency (Hz) and pressure (bar) which were varried from 5 ms to 15 ms, 17 Hz to 25 Hz and 10 bar to 70 bar respectively. The settings produce 27 different engine operations and the strain signal will be captured at each operation. The captured strain signals will be analyzed using I-kazTM Multilevel technique and will be correlated with the main parameters. The relationship between the I-kazTM Multilevel coefficient and the main parameters indicate good correlations which can be used as the guidance for fuel injector monitoring during actual operation. The I-kaz Multilevel technique was found to be very suitable in this study since it is capable of showing consistence pattern change at every parameter change during the engine operation. This monitoring system has a big potential to be developed and improved for the optimization of fuel injector system performance in the automotive industry.

CFD Study on the Influence of Geometric Parameters on the Aerodynamics Within an Ejector Injection System for Compressor Stabilization

2018 ◽  
Author(s):  
Sebastian Brehm ◽  
Felix Kern ◽  
Reinhard Niehuis
Keyword(s):  
Mass Flow ◽  
Armed Forces ◽  
Injection System ◽  
Parameter Study ◽  
Entrainment Ratio ◽  
Node Number ◽  
Nozzle Height ◽  
Secondary Air ◽  
Icem Cfd ◽  
The University

Injection of high-momentum air into the tip-gap region of rotor stages is a measure of active aerodynamic stabilization of turbo compression systems. The Institute of Jet Propulsion at the University of the German Federal Armed Forces Munich advanced the concept of conventional tip air injection by deliberately deploying the ejector effect in order to increase the mass flow rate of the air injected. A novel Ejector Injection System (EIS) has been developed for the Larzac 04 jet engine and its intended ejector performance was proven in experimental pre-investigations. In addition to that, the corresponding CFD setup has been validated and an approach for highly efficient CFD simulations of the EIS ejector aerodynamics (node number reduction > 90%) was developed, verified, and validated. Thus, optimization of the ejector geometry in order to enhance the ejector aerodynamics and subsequently the stabilization performance of the EIS comes into focus now. Within this paper, a parametric CFD study is conducted to determine the influence of three main geometry parameters of the EIS ejector design on the ejector’s performance. The parameters, namely the injection nozzle spacing, the mixing duct length, and the ejector nozzle height, are introduced in the context of the overall EIS design and functionality. For efficiency purposes, a script-based procedure which deploys ANSYS ICEM CFD and ANSYS CFX has been developed in order to conduct the CFD parameter study covering 205 simulations fully automated. Each ejector geometry is thereby simulated with five different primary air mass flow rates supplied to the EIS covering a range from low-speed to transonic operation. It is revealed that all three geometry parameters investigated show partially significant impact on the ejector performance in terms of the entrainment ratio μ. In order to get a detailed insight into the inner EIS aerodynamics, also primary air Mach and Reynolds numbers, the state of mixing between primary and secondary air, and velocity profiles in the LPC’s tip region are subjects of investigation. Based on these findings and the general aerodynamic coherences discovered, recommendations for optimizing the current EIS ejector design are presented.

The Formation of a Combustible Mixture During the First Cycle of Cranking and Startup in a Port-Fuel-Injected Spark-Ignition Engine

2003 ◽  
Vol 125 (2) ◽  
pp. 402-411
Author(s):  
J. S. Cowart
Keyword(s):  
Combustible Mixture ◽  
Operating Conditions ◽  
Spark Ignition Engine ◽  
Fuel Vapor ◽  
Firing Cycle ◽  
Generation Process ◽  
Automotive Engine ◽  
Fuel Model ◽  
Physically Based ◽  
Engine Emission

As automotive engine emission standards continue to become more stringent, excellent cranking, and startup fuel control will become imperative in order to achieve minimum engine-out emissions. Optimized engine starting requires the generation of a strong first firing cycle. Fortunately, an engine’s first cycle event is physically less complex than future engine cycles, providing the opportunity for accurate modeling. A physically based crank mixture preparation model coupled with a multicomponent fuel model was developed to provide insights into the fuel vapor generation process during the first cycle of engine starting. Excellent agreement with experimental data is obtained over a range of operating conditions. Model results show that for increased engine temperatures, fuel distillation becomes of comparable importance to the convective mass transfer fuel vapor formation mechanism. Additionally, the modeling work suggests that fuel pooling near the intake valve is occurring at rich fueling levels. The important effect of engine speed during intake is correctly predicted by the model.

Development of a Model for the Simulation of a Reed Valve Based Secondary Air Injection System for SI Engines

2005 ◽  
Author(s):  
Michele Battistoni ◽  
Carlo N. Grimaldi ◽  
Riccardo Baudille ◽  
Marcello Fiaccavento ◽  
Maurizio Marcacci
Keyword(s):  
Air Injection ◽  
Injection System ◽  
Secondary Air Injection ◽  
Si Engines ◽  
Secondary Air ◽  
Reed Valve

A modified theory for the flow mechanism in a regenerative flow pump

2003 ◽  
Vol 217 (3) ◽  
pp. 311-321 ◽  
Author(s):  
J. W. Song ◽  
A Engeda ◽  
M. K. Chung
Keyword(s):  
Flow Region ◽  
Hydrogen Gas ◽  
Space Vehicles ◽  
Fully Developed Flow ◽  
Vortex Compressor ◽  
Agricultural Industries ◽  
Flow Compressor ◽  
Regenerative Flow ◽  
Modified Theory ◽  
Flow Pump

The regenerative flow pump (RFP) and regenerative flow compressor (RFC) are turbomachines capable of developing high pressure ratios in a single stage. They are also known by other names, such as peripheral, side channel, turbine, traction and vortex compressor/pump. Even though the efficiency of RFP/RFC is usually less than 50 per cent based on past design experience, they have found wide applications in automotive and aerospace fuel pumping, booster systems, water supply, agricultural industries, shipping and mining, chemical and food stuffs industries, and regulation of lubrication and filtering. RFCs have been proposed for use in hydrogen gas pipelines and as helium compressors for cryogenic applications in space vehicles. RFTs are used as accessory drives on aircraft and missiles. With the aim of improving the performance and efficiency of an RFP, this paper proposes an improved and modified theoretical model that can explain the change in the circulatory velocity caused by variation in channel area. All previous works concentrated on the fully developed flow region in the RFP and this work expands consideration to the developing region. Furthermore, in order to make the above-suggested model a closed problem, several loss models were assumed and the results of predictions were compared with experimental and CFD data.

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