The Effect of Fuel Impact on Mixture Preparation in SI Engines with Port Fuel Injection António L. N. Moreira João Carvalho Miguel R. O. Panão IN+, Center.

Slides:

Advertisements

Similar presentations

Experiments on Impinging Intermittent Sprays: Dynamic Behaviour of Impact Miguel Rosa Oliveira Panão Supervised by Prof. António Luis Nobre Moreira public.

Advertisements

D 2 Law For Liquid Droplet Vaporization References: Combustion and Mass Transfer, by D.B. Spalding (1979, Pergamon Press). “Recent advances in droplet.

Chapter 7 : Convection – External Flow : Cylinder in cross flow

Convection in Flat Plate Turbulent Boundary Layers P M V Subbarao Associate Professor Mechanical Engineering Department IIT Delhi An Extra Effect For.

Condensation and Boiling  Until now, we have been considering convection heat transfer in homogeneous single-phase ( HSP ) systems  Boiling and condensation,

Finite Element Modeling and Simulation of the Effect of Water Injection on Gas Turbine Combustor NO x Emissions and Component Temperature Joseph M. Basile.

-1- Microstructure of solid surfaces – characterization and effects on two phase flows ___________________________________________________________________________________________.

Boiling Chapter 10 Sections 10.1 through General Considerations Boiling is associated with transformation of liquid to vapor at a solid/liquid interface.

Two-Phase: Overview Two-Phase Boiling Condensation

Analysis of Simple Cases in Heat Transfer P M V Subbarao Professor Mechanical Engineering Department I I T Delhi Gaining Experience !!!

Engine heat transfer Dr. Primal Fernando

Analysis of In-Cylinder Process in Diesel Engines P M V Subbarao Professor Mechanical Engineering Department Sudden Creation of Young Flame & Gradual.

Design of Systems with INTERNAL CONVECTION P M V Subbarao Associate Professor Mechanical Engineering Department IIT Delhi An Essential Part of Exchanging.

Two-Phase Heat Transfer Laboratory Texas A&M University Experimental Study of Condensation on Micro Grooved Plates R. Barron-jimenez, H. Y. Hu, G. P. Peterson.

Evaporation Downstream Processing Short Course May 2007 Kevin Street Gavin Duffy.

Al 2 O 3 Post Combustion Chamber Post Combustion Chamber ANSYS Thermal Model (Embedded Fuel Grain Concept) Outer radius: 1.25” ( m) Inner radius:

Thermal Development of Internal Flows P M V Subbarao Associate Professor Mechanical Engineering Department IIT Delhi Concept for Precise Design ……

Design of Port Injection Systems P M V Subbarao Professor Mechanical Engineering Department Collection of Models to Predict Multi-physics of Spray …...

Fuel Evaporation in Ports of SI Engines P M V Subbarao Professor Mechanical Engineering Department Measure of Useful Fuel …..

Fuel Evaporation & Mixing Process in Port Injection Systems P M V Subbarao Professor Mechanical Engineering Department Locally Correct Air/Fuel Mixture.

Correlations for INTERNAL CONVECTION P M V Subbarao Associate Professor Mechanical Engineering Department IIT Delhi An Essential Part of Exchanging Heat……..

Computation of FREE CONVECTION P M V Subbarao Associate Professor Mechanical Engineering Department IIT Delhi Quantification of Free …….

Analysis of Fuel Injection & Related Processes in Diesel Engines

Third Generation Fuel Induction Systems for S.I. Engines

Recent Advances in Condensation on Tube Banks P M V Subbarao Professor Mechanical Engineering Department I I T Delhi Reduce the Degree of Over Design!!!

Thermal energy Ch. 6 mostly. Transferring thermal NRG There are three mechanisms by which thermal energy is transported. 1. Convection 2. Conduction 3.

Cross Flow Heat Exchangers P M V Subbarao Professor Mechanical Engineering Department I I T Delhi A Major Element for the Success of Combustion based.

CHE/ME 109 Heat Transfer in Electronics

Wittaya Julklang, Boris Golman School of Chemical Engineering Suranaree University of Technology STUDY OF HEAT AND MASS TRANSFER DURING FALLING RATE PERIOD.

The Thermal Interaction of Pulsed Sprays with Hot Surfaces – application to Port-Fuel Gasoline Injection Systems João Carvalho Miguel R. O. Panão António.

Fuel Induction Systems for SI Engines

Development of Synthetic Air Jet Technology for Applications in Electronics Cooling Dr. Tadhg S. O’Donovan School of Engineering and Physical Sciences.

Effectiveness of Linear Spray Cooling in Microgravity

Evaporation Slides prepared by Daene C. McKinney and Venkatesh Merwade

Pressure drop prediction models o Garimella et al. (2005) o Considered parameters o Single-phase pressure gradients o Martinelli parameter o Surface tension.

Fluid Dynamics of Combustion System for Diesel Engines P M V Subbarao Professor Mechanical Engineering Department Use of Fluid Dynamics to Design Matured.

Module 2 - Heat Transfer Module 2 Objectives Understand conduction, convection, and radiation heat transfer. Explain how specific parameters can affect.

Condensation and Boiling Heat Transfer Source: Vishwas V. Wadekar, HTFS, Aspen Technology J.P. Holman boiling, condensation : high heat transfer rates.

Objectives Calculate heat transfer by all three modes Phase change Next class Apply Bernoulli equation to flow in a duct.

Convection in Flat Plate Boundary Layers P M V Subbarao Associate Professor Mechanical Engineering Department IIT Delhi A Universal Similarity Law ……

Condensation in mini- and microchannels

Analysis of Flow Boiling

Post Injection Process in Port Injection Systems P M V Subbarao Professor Mechanical Engineering Department Models Based Predictions of Multi-physics.

Convection Heat Transfer in Manufacturing Processes P M V Subbarao Professor Mechanical Engineering Department I I T Delhi Mode of Heat Transfer due to.

Heat Transfer by Convection

Flow Characteristics of Port Fuel Injection System P M V Subbarao Professor Mechanical Engineering Department Matching of Injector with Engine Requirements.

Heat Transfer Su Yongkang School of Mechanical Engineering # 1 HEAT TRANSFER CHAPTER 9 Free Convection.

Lesson 7: Thermal and Mechanical Element Math Models in Control Systems ET 438a Automatic Control Systems Technology 1lesson7et438a.pptx.

Energy and Heat. What is Energy? When something is able to change its environment or itself, it has energy Energy is the ability to change Energy has.

Analysis of Port Injection Systems for SI Engines

Design of Port Fuel Injection System

Design of Port Injection Systems for SI Engines

Basics of Fuel Injection in Ports

Spray Impingement & Formation of Films In Ports

CI-DI I C Engines for Automobiles

Development of Port Fuel Injection System

Pressure drop prediction models

Post Injection Process in Port Injection Systems

Development of Design Knowledge for GDI Internal Combustion Engines

Effsys expand May 18, 2016.

Ch. 10 Heat Transfer in Engines

Fundamentals of Convection

20th Century CI-DI I C Engines for Automobiles

P M V Subbarao Professor Mechanical Engineering Department

Post Injection Processes in Diesel Engines

Turbulent Mixing in the Presence of Liquid Droplets with Application to Spray Combustion Venkatramanan Raman Department of Aerospace Engineering and Engineering.

Chapter 10 Sections 10.1 through 10.5

12. Heat Exchangers Chemical engineering 170.

Overall Heat Transfer Coefficient (U)

Presentation transcript:

The Effect of Fuel Impact on Mixture Preparation in SI Engines with Port Fuel Injection António L. N. Moreira João Carvalho Miguel R. O. Panão IN+, Center for Innovation, Technology and Policy Research Mechanical Engineering Department Instituto Superior Técnico

The Effect of Fuel Impact on Mixture Preparation in SI Engines with Port Fuel Injection 16% of total HC emissions due to liquid films. - Cheng et al. (1993) - 15% of injected fuel remains liquid inside combustion chamber  1.5 increase factor in HC emissions between engine cold-start and heated engine. - Meyer and Heywood (1999) - COLD STARTAFTER WARM UP

The Effect of Fuel Impact on Mixture Preparation in SI Engines with Port Fuel Injection Nu = a Re m Pr n We p Arcoumanis and Chang, Experiments in Fluids, vol. 16, pp , Film Evaporation Vaporization/ Boiling Transition Leidenfrost

The Effect of Fuel Impact on Mixture Preparation in SI Engines with Port Fuel Injection 1.To quantify the effects of all surface, flow and fluid properties on the heat transferred in PFI systems Nu = a Re m Pr n We p Ja q Ec w

The Effect of Fuel Impact on Mixture Preparation in SI Engines with Port Fuel Injection Resistance = 8 – 12   t response  10  s Signal gain = 300 Temperature acquired at 50kHz Electronic noise =  0.3ºC Simultaneous measurements of droplet dynamics and surface thermal behaviour

The Effect of Fuel Impact on Mixture Preparation in SI Engines with Port Fuel Injection Nu = a Re m Pr n We p Ja q Ec w New Correlation Film Evaporation Vaporization/ Boiling TransitionLeidenfrost Panão and Moreira, Thermo- and fluid dynamics characterization of spray cooling with pulsed sprays, Experimental Thermal and Fluid Science, in Press.

The Effect of Fuel Impact on Mixture Preparation in SI Engines with Port Fuel Injection 1.To quantify the effects of all surface, flow and fluid properties on the heat transferred in PFI systems; 2.To quantify spatial and injection conditions effects in systems with simultaneous fuel injector activation (cold start and acceleration enrichment).

The Effect of Fuel Impact on Mixture Preparation in SI Engines with Port Fuel Injection (mm)  r = 2 mm Working Conditions Injection frequency = 10, 15, 20 and 30 Hz Duty Cycle = 0.05, 0.075, 0.1 and 0.15 (  t inj = 5ms) Wall temperature = 125, 150, 175, 200 and 225ºC

The Effect of Fuel Impact on Mixture Preparation in SI Engines with Port Fuel Injection N series  Step 1 – Calculate Ensemble-Average Series Average over  70 Series ensemble-average series

The Effect of Fuel Impact on Mixture Preparation in SI Engines with Port Fuel Injection Step 2 – Phase-Average Wall Temperature -5% of T w (t=0) valid injections (N vinj ) ensemble-average series

The Effect of Fuel Impact on Mixture Preparation in SI Engines with Port Fuel Injection Step 3 – Total Average Heat Flux Phase-Average Wall Temperature Transient Profile Reichelt et al., Int. J. Heat Mass Transfer 45 (2002), pp579. instantaneous heat flux CALCULATION

The Effect of Fuel Impact on Mixture Preparation in SI Engines with Port Fuel Injection Reichelt et al., Int. J. Heat Mass Transfer 45 (2002), pp579. T w = 125ºC f inj = 10Hz time-average heat flux

The Effect of Fuel Impact on Mixture Preparation in SI Engines with Port Fuel Injection Panão and Moreira, Thermo- and fluid dynamics characterization of spray cooling with pulsed sprays, Experimental Thermal and Fluid Science, in Press. f inj = 30 Hz  t inj = 5 ms r = 0 mm

The Effect of Fuel Impact on Mixture Preparation in SI Engines with Port Fuel Injection 1.To quantify the effects of all surface, flow and fluid properties on the heat transferred in PFI systems; 2.To quantify spatial and injection conditions effects in systems with simultaneous fuel injector activation (cold start and acceleration enrichment); 3.To develop a methodology to describe the overall thermal interaction acounting for the complex non-linear interactions within the area of impact.

The Effect of Fuel Impact on Mixture Preparation in SI Engines with Port Fuel Injection Step 3 – Total Average Heat Flux total average heat flux T w = 125ºC f inj = 10Hz OVERALL BOILING CURVE

The Effect of Fuel Impact on Mixture Preparation in SI Engines with Port Fuel Injection Step 4 – Spray Cooling Efficiency spray cooling efficiency

The Effect of Fuel Impact on Mixture Preparation in SI Engines with Port Fuel Injection Overall Boiling Curves

The Effect of Fuel Impact on Mixture Preparation in SI Engines with Port Fuel Injection Spray Cooling Efficiency

The Effect of Fuel Impact on Mixture Preparation in SI Engines with Port Fuel Injection

A novel methodology is developed to quantify the heat removed a pulsed spray. Total average heat flux increases with injection frequency due to the associated increase of net mass flux. Nukiyama temperature is independent of injection frequency. Spray cooling efficiency is larger for CHF and lower injection frequencies. A new correlation for the heat transfer coefficient has been developed based on simultaneous measurement of the spray characteristics and surface thermal behaviour: