The Influence of Inlet Port Design on the In-Cylinder Charge Mixing

1989 ◽  
Author(s):  
Bizhan Ahmadi-Befrul ◽  
Wilhelm Brandstätter ◽  
Helnrich Kratochwill ◽  
Christian Troger
Keyword(s):  
Inlet Port ◽  
Port Design

The Effect of the Helical Inlet Port Design and the Shrouded Inlet Valve Condition on Swirl Generation in Diesel Engine

2017 ◽  
Vol 140 (3) ◽  
Author(s):  
Saleh Abo-Elfadl ◽  
A. Abd El-Sabor Mohamed
Keyword(s):  
Three Dimensional ◽  
Great Influence ◽  
Flow Characteristics ◽  
Volumetric Efficiency ◽  
Swirl Ratio ◽  
Inlet Valve ◽  
Inlet Port ◽  
Engine Cylinder ◽  
Port Design ◽  
Dimensional Simulation

Inlet port design has a great influence on swirl generation inside the engine cylinder. In this paper, two helical inlet ports having the same helix design were suggested. The first has an upper entrance, and the second has a side entrance. With the two ports, shrouded inlet valves having different conditions of shroud and orientation angles were used. Four shroud angles were used; they are 90 deg, 120 deg, 150 deg, and 180 deg. Also, four orientation angles were used; they are 0 deg, 30 deg, 60 deg, and 90 deg. Three-dimensional simulation model using the shear stress transport k–ω model was used for predicting the air flow characteristics through the inlet port and the engine cylinder in both intake and compression strokes. The results showed that the side entrance port produces swirl ratio higher than that of the upper entrance port by about 3.5%, while the volumetric efficiency is approximately the same for both ports. For both the ports, increasing the valve shroud angle increases the swirl ratio and reduces the volumetric efficiency. The maximum increments of swirl ratio relative to the ordinary valve case occur at valve conditions of 30–150 deg, 0–180 deg, and 30–180 deg. At these valve conditions, the swirl ratio values are 6.38, 6.72, and 6.95 at intake valve close (IVC) with percentage increments of 69.2%, 78.2%, and 84.4%, respectively. The corresponding values of the volumetric efficiency are 93.6, 92.5, and 91.2, respectively, with percentage decrements of 2.84%, 4%, and 5.7%, respectively.

A Parametric Approach to Spark-Ignition Engine Inlet-Port Design

1999 ◽  
Author(s):  
Hugh Blaxill ◽  
Jonathan Downing ◽  
Justin Seabrook ◽  
Mike Fry
Keyword(s):  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Parametric Approach ◽  
Inlet Port ◽  
Port Design

scholarly journals A Port in the Storm

1999 ◽  
Vol 121 (11) ◽  
pp. 78-79
Author(s):  
Steve Pierson ◽  
Steve Richardson
Keyword(s):  
Fluid Dynamics ◽  
Computer Simulation ◽  
Design Process ◽  
Fuel Economy ◽  
High Accuracy ◽  
Dramatic Improvement ◽  
Inlet Port ◽  
The Past ◽  
Port Design ◽  
Fuel Consumption And Emissions

Computer simulation of the inlet port is helping to provide improved fuel economy and emissions in up-coming Jaguar models. Jaguar engineers have long wanted to improve the inlet port design process by simulating flow in alternative inlet port designs. The engineers, however, experienced problems in modeling the complex internal contours of the inlet port and chamber. The dramatic improvement in modeling speed combined with the high accuracy of sin1.ulation has made it practical to integrate computational fluid dynamics into the inlet port and chamber design process. Jaguar engineers are now able to evaluate concept designs within one week compared to the month or more that was required in the past. Engineers have been able to make significant improvements in the performance of their most recent inlet port designs, increasing flow efficiency by an average of 10 percent, while maintaining turbulence at acceptable levels. These improvements will provide significant reductions in fuel consumption and emissions in future Jaguar engines.

scholarly journals Physics basis for the ICRF system of the SPARC tokamak

2020 ◽  
Vol 86 (5) ◽  
Author(s):  
Y. Lin ◽  
J. C. Wright ◽  
S. J. Wukitch
Keyword(s):  
Alpha Particles ◽  
Fast Wave ◽  
Vacuum Vessel ◽  
Auxiliary Heating ◽  
Heating Method ◽  
Full Field ◽  
Single Pass ◽  
Wave Absorption ◽  
Port Design ◽  
Icrf Heating

Ion cyclotron range of frequencies (ICRF) heating will be the sole auxiliary heating method on SPARC for both full-field (Bt0 ~ 12 T) D–T operation and reduced field (Bt0 ~ 8 T) D–D operation. Using the fast wave at ~120 MHz, good wave penetration and strong single-pass absorption is expected for D–T(3He), D(3He), D(H) and 4He(H) heating scenarios. The dependences of wave absorption on ${k_\parallel }$ , 3He concentration, resonance location, antenna poloidal location and losses on alpha particles and ash have been studied. The antenna loading has been assessed by comparison with the Alcator C-Mod antennae. An antenna spectrum of ${k_\parallel }\sim 15\text{--}18\,{\textrm{m}^{ - 1}}$ is shown to be good for both core absorption and edge coupling. For the control of impurity sources, the antenna straps are rotated ~10° to be perpendicular to the B field and the straps can run with different power levels in order to optimize the antenna spectrum and to minimize the image current on the antenna frame. Combining the physics constraints with the SPARC port design, maintenance requirement and contingency against antenna failure during D–T operation, we plan to mount on the inner wall of the vacuum vessel a total of 12 4-strap antennae in 6 ports while keeping 3-strap antennae that are insertable and removable on port plugs as the backup option.

The Effect of Injector and Intake Port Design on In-Cylinder Fuel Droplet Distribution, Airflow and Lean Burn Performance for a Honda VTEC-E Engine

1996 ◽  
Author(s):  
N. E. Carabateas ◽  
A. M. K. P. Taylor ◽  
J. H. Whitelaw ◽  
Kiyoshi Ishii ◽  
Kazuo Yoshida ◽  
...  
Keyword(s):  
Intake Port ◽  
Fuel Droplet ◽  
Lean Burn ◽  
Droplet Distribution ◽  
Port Design

Post Fuel Injection Fuel Vaporization Characteristics in the Intake Port of a Port-Fuel-Injected Gasoline CFR Engine

2006 ◽  
Author(s):  
Jim S. Cowart ◽  
Leonard J. Hamilton
Keyword(s):  
Gasoline Engine ◽  
Fuel Injection ◽  
Fuel Vapor ◽  
Intake Port ◽  
Fuel Injector ◽  
Intake Valve ◽  
Inlet Port ◽  
Fuel Vaporization ◽  
Control Computer ◽  
Vapor Sampling

A Cooperative Fuels Research (CFR) gasoline engine has been modified to run on computer controlled Port Fuel Injection (PFI) and electronic ignition. Additionally a fast acting sampling valve (controlled by the engine control computer) has been placed in the engine’s intake system between the fuel injector and cylinder head in order to measure the fuel components that are vaporizing in the intake port immediately after the fuel injection event, and separately during the intake valve open period. This is accomplished by fast sampling a small portion of the intake port gases during a specified portion of the engine cycle which are then analyzed with a gas chromatograph. Experimental mixture preparation results as a function of inlet port temperature and pressure are presented. As the inlet port operates at higher temperatures and lower manifold pressures more of the injected fuels’ heavier components evolve into the vapor form immediately after fuel injection. The post-fuel injection fuel-air equivalence ratio in the intake port is characterized. The role of the fuel injection event is to produce from 1/4 to slightly over 1/2 of the combustible fuel-air mixture needed by the engine, as a function of port temperature. Fuel vapor sampling during the intake valve open period suggests that very little fuel is vaporizing from the intake port puddle below the fuel injector. In-cylinder fuel vapor sampling shows that significant fuel vapor generation must occur in the lower intake port and intake valve region.

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